Kate Miller No Comments

Sliding doors at Laserfiche’s New Headquarters

Sing Core is honored to be part of making an innovative workspace for Laserfiche in Long Beach, CA.

RDC of Long Beach California designed these doors to work seamlessly with this interior workspace. Following the design of RMC, Seeley Brothers Millwork of Brea California used four custom made Sing Core panels to complete this project for Laserfiche.

These Sing Core sliding doors are used to allow these workspaces to feel like one larger room and a second later be a quiet and private meeting space. Sing Core doors naturally dampen noise of an active workspace to easily allow other employees to concentrate and be more productive. These were some of the core ideas that Laserfiche had when building their new Headquarters.

These elegant lightweight doors are extremely strong and durable. They are made of the highest quality material suitable for any museum, mansion or workspace.

As you can see these doors have to be completely straight to allow a perfectly matched seam when they are closed.

“They are the most exciting sliding doors I have ever seen” -Peter Sing, Sing Core inventor.

Simple to design, simple to order. See the shop drawings here.

See other sliding doors here.

Want these doors in your next projects? Get an estimate here.

We’d like to thank everyone that came together to make these magnificent doors come to fruition: Studio One Eleven, RDC Architects, Millie and Severson Contractor, Seeley Brothers Millwork and of course Laserfiche for wanting to improve their employee’s wellbeing with this innovated design.

Laserfiche is a leading global prover of business process and information management software. They have been part of the Long Beach community since 2001. They were founded over 45 years ago and also have offices in Washington DC, Guadalajara, Hong Kong, London, Shanghai and Toronto. 320 of the 425 employees are in the Long Beach area and they are steadily growing.

Their new headquarters was completed in May of 2022. It is over 100,000 square feet, with four floors and a parking garage. It can accommodate 550 full-time employees working in-office and up to 750 hybrid workers. Studio One Eleven’s design mirrors a landmark garden-office building across the street designed by the late Mid-Century architect Edward Killingsworth. They incorporated such Mid-Century Modern elements as large windows and terrace decks that provide amble natural lighting. The height is the same as the adjacent building allowing to blend in seamlessly. Chris Wacker, chief executive of Laserfiche, Wacker called the space “extremely functional and useful in a hybrid environment.”

The design layout shifted the service core to the western edge of the building, typically in the center. This allows a larger continuous communal and workspace environment. This also blocks the western solar heat. Now the elevator is tucked away and the stairs are front and center, promoting the healthier option of taking the stairs.

Laserfiche was committed to staying in the Long Beach area and are in the Bixby Knolls neighborhood. Here on Long Beach Boulevard near the San Diego Freeway, their Mid-Century landmark makes a bold statement to the half a million daily drivers who pass by. Before Laserfiche purchased this land, it was considered an unusable wasteland left over from oil extraction years. They capped off the old oil wells and removed the old hazardous tanks.

According to Chris Wacker, Laserfiche CEO, “We have abandoned the traditional vertical office building paradigm, emblematic of individual aspiration, for a horizontal environment where connections are fostered and relationships built and we’ve implemented ideas from our products into the design of the building we know that process automation makes life easier. It removes the bottlenecks and impediments to fluid operations, promotes efficiency and allows organization to thrive. This building’s open design does the same thing. It enhances the free-flowing information making our lives simpler and more creative.”

“This building is the future of work. People sharing spaces in the ways most productive for them. As we learned over the past two years, that makes the most productive for the company and the people that use our products. Just as Laserfiche is dedicated to helping people turn their data into digital assets, this building helps Laserfiche maximize the potential of its people. Laserfiche digital transformation increases your people power by eliminating the unproductive and focusing on the creative, and that’s what this building does. It’s a hybrid workspace for a hybrid workforce.”

Watch this video for a deeper look into this project from RDC.

Sing Core is proud to be a part of the continued evolution of door technology to make our customers’ lives more enjoyable. Whether that be in pivot doors, sliding doors, hinge doors, pocket doors, or any oversize door. We enjoy the challenge. We invite you to GET AN ESTIMATE and see for yourself how Sing Core’s true flat door cores can help you make the doors that your customers are asking for.

Thank you RDC and Studio One Eleven for the use of your photos and video.

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The Most Insulated Airtight Lightweight Strongest Door

Any door built with SingCore inside could be the most insulated, airtight, lightweight and strongest door in the world, thanks to patented SingCore.

Carriage doors are shipping to nostalgic homes in San Francisco, Green Lake, Seattle, Puget Sound and similar residential areas around the USA to make better use of extra garage space for converting to extra living space.

bi fold garage doors 16x8 garage door automatic garage door opener

See more about these Bi-fold Garage Doors
If you’re garage plans include looking to convert your garage into livable space, garage apartment, work shop, guest room or even an office, then you need to replace your current garage door with a patented SingCore carriage door. The most airtight door in the world can be fully guaranteed for structure strength and to remain warp-free for 50 years. No other carriage door is so lightweight, nor do they have the highest strength.

1. How Do You Do It?

See: How to Build a Sing Door

2. Why SingCore doors are the best choice for your garage door if you’re looking to convert your garage to a livable space:

Patented SingCore is changing the technology used and how to build a door with insulation for garage door. It starts with the successful story of building a high end door for a Manhattan penthouse.

SingCore door panels offer the best guarantee in the large door industry: 50 Years Warp-free and Structure Guarantee

If you are in the high end large door business, you know that no manufacturer wants to make a large door due to potential problems with warping. All the doors made of wood base core or skin are going to warp, it’s just a matter of time; sometimes within a month following the door installation compromising the garage door weather seal.

SingCore uses a combination of patented and patent pending large door technology to keep your Sing precision garage door straight and true, which keeps your garage with apartment plans air tight. Maintaining weather seal is so important for your garage with living space.

Garage doors deal directly with weather conditions, which is the primary reason for distortion in your garage door. Whether it’s a carriage door or overhead garage door, it’s almost impossible to keep it airtight due to their natural design and characteristics.

If you’re looking for a warm or cool garage conversion maximizing extra space for your comfortable living garage with apartment, SingCore garage door is the only choice, guaranteed by inventor Peter Sing.

3. How to design Sing carriage door

Special or custom order your Sing carriage door by filling out the order form (you must be in the trade or hire a trade professional to order it for you).

a) Design Look. Begin with surface design and by adding molding to create any type of appearance. Add glass or light treatment, cut Sing sandwich or Sing panel then add glass

b) Skin Choice. Very lightweight and weather proof skin will be 1/8 inch marine plywood, aluminum, FRP, HPL, etc…

c) Choice of Thickness

d) Strength Thickness of Sing Panel: Doubling the thickness will increase 4 times the strength. Standard thickness of sing panel is 1.5 inch and 2 inches but custom size thickness is almost unlimited

e) Edge Treatment. Sing sandwich panels are easy to cut to any size as well as adding the trim to create a solid edge to adapt to any size of door opening. If ordering Sing panel, the standard edge is 1.25 inch solid wood but with extra money you may order any size of solid wood on 4 sides of Sing panel

f) Size Limit of Sing Panel. Almost no limit for height and width of any Sing carriage door. Tell us the size and we will prove it to you

g) Window Light Cut Out. You may install any shape and almost any size of window at any location of the Sing door panel. (see pic.)

h) Man Door. We could provide man door cut off and install a man door in the Sing door panel for your easy access of the garage space without open the entire garage door.

I) Hard Point. Solid wood implant.


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No More Warped Door

50 Year True Flat Replacement Doors

Copper Door

Copper Door

Building the most stable door is our specialty. With our patented true flat technology, Sing Core provides clients with insulated Eco-friendly lightweight high-strength doors that prevent wood warping doors. Often we are sought out for replacement doors to solve the problem of doors that fail following installation. Doors – especially exterior, large or special purpose doors – are prone to warping, bending, twisting or cupping.

Why Do Doors Warp?

So many things can contribute the failure or the success of your large door’s performance.

  • Size: Length, width, thickness
  • Skin: Some materials are more prone to warp than others
  • Core: The core material will affect the door’s overall performance
  • Environment: Exterior facing direction, weather, exposure to moisture and/or other conditions.

FREE CONSULTATION for your next large door project. You tell our non-warp experts your door’s specifications and expectations and they can provide you with the only non-warp solution guaranteed for 50 years.

What if you started with a Sing door instead of using it as a door replacement?

Only true flat wood front doors by Sing Core can be guaranteed to be flat and stay flat and stay solid for 50 years. Most foam-filled doors might be straight but need patented Sing Core structural grids to keep it strong and tough to avoid failure following impact or due to exposure. Creating a warp-free large door is a challenge for all door manufacturers because it is almost impossible to make a large door that will be straight and stay straight over time. That is, of course, until the invention of Sing Core.

How can you make the most stable door that can be guaranteed true flat for 50 years?

Sing Core has developed true flat technology that consists of three phases.

Sing-panels-lightweight-high-strength-honeycomb-core#1: Sing Core

The first phase is to start with patented Sing Core as the basis of your true flat door. Sing Core is a composite honeycomb material consisting of natural vertical wood grain torsion box where the voids are filled wall-to-wall with solid recycled foam material that is 90% air. The natural wood torsion box inner frame yields only 8% of this natural resource in comparison to a solid wood door. This provides the strongest Eco-friendly, lightweight door core that will not warp, bend or twist.

#2: Skin Selection

Maple-Cherry-Oak-VG-Fir-Walnut-Sing-CoreThe skin selection is matched to your desired appearance of the door. Do you desire a solid wood grain door? If so, what wood species? Besides wood, we can manufacture a Sing door to host any flat building material, including (but not limited to) aluminum, ceramic, concrete, glass, fiberglass (FRP), plastic, LVL, MDF, Mag-board, stainless steel, veneer, even more custom high-end surfaces like, Kevlar, etc…

Reinforced-Structural-Insulated-Panel-vs-Structural-Insulated-Panel-Sing-Core-vs-SIP#3: Performance Enhancement

Next, our true flat experts review the expected performance and usage of your door. Based on how you want your door to perform and under what conditions, our experts may incorporate additional stress skins to bond directly to the Sing Core base to match your desired outcome. How large are the dimensions of your door? Will your door be exposed to the elements? What extreme exposure, if any, will the door face? Will your door be used: Underwater, in temperature-controlled environments, as sound proofing, to prevent harm to persons or property, etc…?

Any Sing composite door can be guaranteed true flat for 50 years, while matching the appearance of:

Framed Stile and Rail Doors

Weatherproof Church Doors

Weatherproof Church Doors

Also called raised panel doors (when in reality it is not raised panel at all. The appearance of “raised panel” is obtained by graduated cutaways that compromises the integrity of the door). These doors are normally made of several different solid wood (or composite) pieces assembled by dowels or other connections.

True Raised Panel Doors

True Raised Panel Doors

The individual components, connectors and adjoining seams tend to move due to moisture, temperature change or with heavy use or vibration over time.

By examining the red door (left) you would never know that this wood Sing door was not stile and rail yet will last for centuries without fail even though exposed to the weather 100%. The appearance of this door perfectly replicates the appearance of the stile and rail doors that were replaced.

Flush Doors and/or Solid Wood Doors

wood-flush-doorSolid wood doors are a romantic and nostalgic nod to days gone by, but solid wood is well known for bending, warping and twisting due to the natural grain of the wood itself.

LVL is a heavy solid core that is more consistent than solid wood in terms of warp, bend and twist when used in wood doors but will often fail (especially in doors over 10 ft. tall) and once it does begin to move, cannot be stopped or straightened as it has no memory.

Foam Core Doors

Foam core doors such as most FRP door, metal door, etc… are lightweight but have no strength or structural integrity.

Almost any impact will compromise the door causing the door to weaken and/or delaminate, unless it incorporates patented Sing Core structure grid technology.

Break a Leg

Only Sing doors can take the abuse without running the risk of breaking or delaminating.

If you kick a door, it is likely to break; kick a Sing door and you will break your leg.

The Sing Secret

Sing-secret-to-lightweight-high-strength-door-technologyThe secret behind Sing Core’s success is not merely in the torsion box design (which has been used for hundreds of years) but in the orientation of the natural wood grain used to form the grids that are the basis of the internal structure for the patented non-warp base material enhanced by stiffening technology to counter-act potential warp.

In the past, torsion boxes were built with horizontal grain, that while running parallel will tend to fail by bending in harmony with the outer wood skin material. Sing Core flips this technology on its edge by contrasting the orientation of the wood grain to be perpendicular to the exterior wood grain resulting in many times the strength.

Previously solid Balsawood core has been used as door core with perpendicular oriented grain successfully but runs the risk of compromise or failure due to its natural characteristics that will also move due to moisture exposure, climate or temperature change. But it doesn’t stop there.

Next, inventor Peter Sing bonded recycled foam (which is a lightweight solid material consisting of mostly – 92% – air) wall-to-wall inside each void of the vertical grain torsion box grids for unsurpassed shear strength and solid core material throughout.

This is how patented Sing Core has accomplished nearly inconceivable strength in the lab (660 PSI, tested by University of Washington as stronger-than-steel pound-for-pound), yet still remaining lightweight.

All this combined with the Sing Composite Formula for specialized stress skin integration results in the only true flat doors that are built to last for centuries.

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Sing Sandwich Panel

Sandwich Panel

torsion box, sandwich panel, honeycomb panel, lightweight panel

Standard sandwich panels utilize an insulating foam core sandwiched in between two thin sheets of hard material.  However, this design offers very little strength and durability. Sandwich panels made by Sing Core are stronger, lighter, and more eco-friendly than these conventional panels because we replace the standard foam core with our patented vertical grain, natural veneer torsion box grid also known as the Sing Core.  For the consumer, this translates into a higher quality product at a fraction of the cost.

(click to visit our product gallery)

Insulated doors made with traditional sandwich panels are highly susceptible to dents and structural damage because of their weak foam core.  Doors made with our Sing Core sandwich panel technology can withstand much higher impacts resulting in little or no damage due to our unique core properties.  The University of Washington has confirmed that our doors can withstand pressure of up to 660 psi, as compared to the average sandwich panel which can only withstand 60-100 psi.





How can Sing Core sandwich panels be used? Doors, shelving, table-tops, flooring, bookcases, furniture, outdoor decking material, truck/trailer beds even water tanks, to name a few. The possibilities are endless.



If you desire products that are lightweight, strong, durable, dimensionally stable, and eco-friendly, then you must try our Sing Core Sandwich Panels.  We like to demonstrate our confidence in the integrity of our products by offering our customers a 10 year structural guarantee.

(click to visit our product gallery)

Since our company’s inception, our products have made in the U.S.A..

Please share this message with your friends and business associates.


Or fill out our Work Order Form to get a free quote.


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Connect Index

Applications -> Building Components -> Assembly & Connecting

Connecting Panels

How to Build Gallery

Connection Page


There are many ways to join Sing Panels

Simple Joining

The simplest and least expensive way to join sing panels is to join in any way according to your budget and/or expertise.

Due to Sing Panels being so straight and true it is easier to join panels together because they line up perfectly unlike other building materials.


sing-core-panel-cam-locks-3sing-core-panel-cam-locks-2In many cases, for instance, standard 4×8 panels can be nailed, glued or channel-joined quickly and easily with satisfactory results.

Other options for fastening panels may include cam locks (see examples left and right) that can be pre-installed, making assembly and joining easy and more secure.

The Sing cam-lock panel solution is a high-demand solution for panels that are routinely assembled and disassembled, especially in moveable walls, trade show booths, and various wall cladding applications. See: Cam Lock Panels

Connect multiple panels together in any configuration

Add lightweight high strength Sing modular shelves

Thru-bolt Joining

One of the most inexpensive and secure ways to join sing panels is by utilizing a simple nut and bolt connection method, especially, if the panels will be routinely or repeatedly assembled and disassembled.

Stainless steel nuts and bolts offer the safety and security when joining sing panels.


Biscuit Joining

In many cases, Sing Panels can be pre-configured for biscuit joining at your site of factory.

Especially for large projects, this enables Sing Core panels to be sent individually, reducing shipping and handling costs, for assembly at your facility or job site.

See images below for example of biscuit assembly of Sing Panels


Spline Joint Connection Method

additional images

Sing Core Dowel Joint

Joining With H Channel and H Molding

Embedded T-Slot Extruded Aluminum

In your choice of T1 (1 exposed slot) or T3 (3 exposed slots)

See: Sing T Slot Panels for more information.

Edge Banding

Unless specified Sing Panels do not ship edge-banded as 93% of our wholesale customers do their own edge-banding when finishing their Sing Panel.

Edge banding can take many forms from vinyl and plastic to wood and steel. Sing Panels are not intended for use as an un-banded product and may not qualify for our 50 year warranty if un-banded.

If your intention is to get the best, most long-lasting performance from your Sing Panels, feel free to take advantage of our free consultation to be guaranteed to achieve the results that you desire.

Edge Banding Options Include:

T Molding

Metal T molding closeup on sliding door lightweight high strength steelMetal T molding on large lightweight high strength non warping steel doorHere is an example of a large lightweight high-strength non-warping sliding door.

Note the steel T molding being installed to complete the door’s composition.

This door is guaranteed not to warp, bend, twist or otherwise fail due to being properly engineered and manufactured to exceed the specifications of this oversized architectural door.

T Molding

L Molding

Flat Molding

U Channel


Photo courtesy of Vancouver Doors


Advanced Large Panels

Sing Core specializes in extremely large panels (up to 50 feet) that are extremely true flat and use our nearly seamless assembly process.

This is the most high-end and expensive process where we perform the highly specialized meticulous work in our factory yielding the high level of perfection that many of our most discerning clients require. See: our clients.

These must be manufactured in our plant to ensure accuracy with tolerances within thousandths of an inch and are more costly to ship due to the nature of their being larger than multiple panels that can be assembled on-site.

Connectors for Connecting


One of our many features is the ability to add fasteners/locks to our panels…one example of this is the “S-Hook Lock” with a turn of the hex wrench you can fasten or unfasten your panels quickly.

The “S-Hook” fastening lock that is attached to the side of these panels to allow for easy assembly of the wall system.

With a quick turn of your wrist on the hex key your panels will be attached to each other.



Barn Door Assembly or ‘H’ Channel

If you are planning to keep your panels as a permanent structure you may choose the H-Channel attachment feature. Apply your adhesive the slide panel into the channel on each side then either veneer over the panel and channel or you may choose to putty, sand and paint your panels to cover over the H-channel.

Tongue and Groove

Tongue and groove is another fastening choice especially if you using our panels for flooring or ceiling. Make a nice almost seamless connection but give wood veneer a hardwood flooring appearance.

Biscuit Joint

This is a modified biscuit joint attachment. Similar to the H-joint the you are using a single long “beam” as the connector and gluing them together. Best use is for oversize tables (such as vacuum tables) and oversize doors as well. Because our panels are made of honeycomb rather than solid wood, they will not warp. Our honeycomb is light and strong.

Ship Lap

The ever popular ship lap as a connector alternative.

With the wide variety of applications for Sing Core panels, posts and beams, and equally diverse selection of fasteners are used in practical installations.sing-core-panel-cam-locks-2Here are some of the most popular fastening systems used today:Norse Inc. LatchesNorse latches are designed for concealed installation in Sing Panels. Multiple configurations of latches and receivers are possible to suit many applications, and offer numerous advantages.Click Here for More InformationKnape & Vogt Manufacturing Company

Sing-Panel-FastenersMore than a century of experience to the design, manufacturing and distribution of functional hardware, storage-related components, and ergonomic products for original equipment manufacturers of the Tite Joint Fastener Draw Bolt.

Click Here for More Information

Pan American Screw

An International leader of innovative threaded fastening solutions. Developers of the Draw Bolts and Zipbolt™ tight joint fasteners. They are constantly testing and developing fasteners that are easier, faster and less costly to use.

Click Here for More Information


Sing-Panel-Fastener-FlipBolt-Dog-BoneOver the past five years, FastCap has grown exponentially and has expanded its products base from the Fastcap to a vast array of woodworking products and tools, like the FlipBolt Tite-Joint Dog Bone Fastener Tool-less Draw Bolt.

Click Here for More Information

ITW Fastex

The range of panel fasteners and plastic clips available from ITW Fastex is designed to fill most fastening requirements. The range of applications is wide from machines, appliances, and computers to recreational vehicles and point of purchase displays.

Click Here for More Information


Shur-Lok fasteners and components are designed to satisfy customer requirements in two general application ideas: secondary structures, such as interior stow bins, lavatories and galleys, and primary structures, such as aircraft engines, engine pylons, landing gears, wings, gearboxes, transmissions and helicopter rotors–all critical applications.

Click Here for More Information

Veck Fasteners

Special and bespoke bonding fasteners. In addition to Veck Fasteners standard range of popular bonding fasteners, we provide purpose-designed special and bespoke bonding fasteners for customers who have specific requirements which cannot be fulfilled from our standard range.

Click Here for More Information

Just to name a few…

Fasteners and Anchors for Sandwich panels



CEL FASTENERS are innovative tools to anchor and attach and remove sandwich panels easily and quickly.

The advantages of CEL’s fasteners are:

  • Possibility to attach and detach the panels quickly to carry out maintenance work or substitution
  • Invisible bolts
  • Precise positioning and multiple removals
  • Quick assembly
  • Cost reduction

Initially developed in compliance with to the needs of shipyards, this anchoring system is more and more used in different sectors:

  • Shops’, hotels’ and trade fairs’ assembly
  • Lifts
  • Transport: buses, trains, vans, etc.
  • Carpentry
  • Furnishing

potted inserts rivnuts helicoil inserts blind inserts with tabs spool inserts for sing honeycomb panelsImplants

Solid wood implants can be placed anywhere inside your custom Sing Panels for attaching hardware or other anchoring, including lock blocks and the like.

Individual connection inserts can be specified at specific locations to meet all your connection method needs. These can include, potted inserts, Rivnuts, Helicoil inserts, blind inserts with tabs and spool inserts, just to name a few.

Liability disclaimer

The above data are to the best of our knowledge correct and are intended to give information about our products and their potential applications. No warranty is given or implied in respect of certain properties of the products or their suitability for a particular application. We reserve the right for technical changes without further notice. We guarantee impeccable product quality under our terms of sale.


Examples of Joining Sing Panels

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Torsion Box

Torsion Box


Sing Core Torsion Box Panels

Patented Sing Core: We put a torsion box in the SIP panel to make it better. The other names for our panels include sandwich panel, honeycomb panel and lightweight panel.


Sing Punch-Proof Doors

SINGCORE-The torsion box core makes it impossible to punch through and destroy.


torsion box, sandwich panel, honeycomb panel, lightweight panel
Punch proof Sing Core door.
Typical paper core door. (click to see more)


What door companies do not want you to know.

torsion box animationAs long as you cannot see the paper core hide inside the door, they will not change it to Sing core. Sing core does not cost not much more than core made of paper but is at least 49 times stronger.

Punch through a Sing door and you will break your hand. If you can manage to punch through a Sing core punch-proof door and don’t break your hand then you will get a free sing door from us.

The most common doors used in most homes are paper core doors. With one punch you can destroy one of these flims doors. Once the door is broken you will need to take it to a door shop to get if fixed or replaced and then take it back and install it. The cost is not only a door, it is how to dispose of it, take it in and out of the shop, build or replace the door and install it. Why not just buy a Sing door to begin with. Sing doors are not much more expensive than paper core doors when consider the life span and they are free. What is your time worth?

Stronger than Steel,

Lighter than Wood

Your door doesn’t have to be steel to be strong. Sing Honeycomb Doors are stronger, lighter and more stylish than steel and vinyl doors due to the torsion box core.

Sing Doors are more stable, insulated and lightweight than solid wood doors. The torsion box core holds the Sing Door Panel flat so that it willnot warp and sag like ordinary wood. A 16lb steel hammer will easily dent a steel or vinyl door, but not a Sing Door. Because Sing panels are efficient to produce, they are more affordable than solid wood doors.

Patented Sing Door Methods

Sing Honeycomb doors are versatile, and customizable. Even the technoly used to construct the door can cater to our customers’ individual needs.

To see more torsion box pictures and web sites visit the Google image galery.

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Tiny Index

Expires August 25th, 2017

Products > Tiny House

Tiny House Panels

Tiny House Mobile Small Home on Wheels




Photo Gallery   &   See our Folding Modular House Competition


Getting Started

Stronger than Steel, Lighter than Wood

The easiest method to build an insulated small house is by using patented Sing honeycomb panels!

Earth friendly living is the spirit of Tiny House dwelling. What better way to build Tiny Houses than with Sing Honeycomb Panels?

Sing Tiny House Sandwich Core Panels are great for wood sheds, living spaces, living off code, guest houses, ticket booths, pump houses, studios, disaster relief structures, utility sheds, playhouses, espresso stands and any other small building needs. They travel safely, construct quickly, and look beautiful.


  • Recycled foam core
  • Renewable veneer
  • Formaldehyde free glue
  • Minimal carbon footprint
  • Insulation saves energy
  • Manufactured efficiently with minimal emissions


All in One

Our prefabricated panels and logs include insulation, framing and interior and exterior siding. Our thin sandwich panel walls give you more space inside your home. We replace the need for sheet rock, which weighs a ton. Sing helps you build your house simply and quickly, so you can start living.

  • Insulation
  • Siding
  • 2” thick panels

Simple and Quick

Sing Logs and Sandwich Panels are user friendly. They weigh less than a third as much as an equivalent slab of sheet rock, so you can easily and safely construction your home.

  • Fewer materials
  • Fewer steps
  • Lightweight

Strong and Stable

Sing Tiny Houses are structurally superior to traditional 2” x 6” framed structures because the glue we use for the sandwich panels covers the entire surface area and creates a stronger bond than nails ever could. This will save thousands of nails and over time will ensure the structural integrity of your Tiny House. Sing Honeycomb Panels have precision to within .007 of an inch. This means your Tiny House will be structurally sound and perfectly smooth. After years of expansion and contraction, nails settle, cracking your timber. The structural glue used with Sing Panels will not settle and cause warping over years. Help us to preserve the environment by using high quality, long lasting Sing Panels.

  • Compression strength up to 660psi
  • Resists dents and dings
  • Rigid and straight


Sing Square Log Homes makes large sandwich panels (4’x8′ and 4’x10′), so your house will have fewer seams. The core is covered by any of a wide variety of skins from natural wood to metal, customized to suit your display style. From rustic to modern, Sing panels are made for your Tiny House!

We offer many skin choices*:

  • Aluminum
  • Marine Grade Plywood
  • Plywood
  • Douglas Fir
  • Birch/Luan
  • Cedar

*Specialty orders are available at a cost.


fs 3

Technical InfoFAQTestimonialsPrice & Order



Celina Dill Tiny House Blog

“Learning about Sing Panels completely changed the way I look at building.”

— Celina Dill, Tiny House Blogger

See pictures at her blog and in our gallery.

Yes, Sing Core does make the best reinforced structural insulated panels (RSIP) for use in Tiny House applications as walls, floors, ceilings and roofs. We have a huge desire to support the tiny house industry but be aware that we only offer Sing Panels for tiny house construction to professional distribution channels. Since we offer no support for our products (besides what is readily available via our web site). Our operation is not setup to sell our products to people in need of retail customer service. We suggest that you seek answers to any questions about how to use Sing panels by consulting with your engineer, architect, builder or contractor.

Note: We do occasionally offer products direct to the do it yourselfer, like Tiny House panel Kits or Tiny House Surplus Panels. Though we may provide you with the materials, we offer no how-to support to the DIY enthusiast except that which is available via our Tiny House FAQ (frequently asked questions) and other online resources.

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Fiberglass Index

Products > Fiberglass (FRP) & Plastic

SING CORE Fiberglass (FRP) & Plastic


Sing Core

The cut away of the Sing Core panel show the patented core that makes the difference. If you want the best panel or door available make sure you use Sing Core.

Patented Sing Honeycomb Fiberglass door (10' x 3' x 2.25")

Patented Sing Honeycomb Fiberglass door (10′ x 3′ x 2.25″). Ready for fiberglass edge banding.


Fiberglass French door

Lightweight, high strength finished fiberglass French door.


Deflection test, Sing Core

Deflection test of a finished fiberglass trailer deck.

Fiberglass trailer deck (13' x 6')

Fiberglass trailer deck (13′ x 6′). Very strong but lightweight.

underside of the fiberglass trailer deck

The underside of the fiberglass trailer deck.


Fiberglass water tank

Fiberglass water tank can be used for a hot tub, fish tank or even water storage.


7' x 3' fiberglass door

7′ x 3′ fiberglass door with blue gel coat.


Sing Door Strength Demo


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Applications -> Building Components -> Doors -> More Doors

#1 Best Seller: Oversize Doors

80% of the doors we sell are true flat large oversize doors (over 4 ft. x 8 ft.), though we do specialize in 5% regular-sized doors.

#2 Best Seller: Sliding Door

Custom Lite Openings for Glass – No Extra Charge

The door is a moving structure used to block access, visibility and noise between two otherwise connected areas. The door as we know it is moving to the next level of high-performance, safety and security thanks to patented Sing Core.

This new door revolution is introducing a new evolution in door technology that delivers an insulated door that is true flat, lightweight, stronger than steel and Eco-friendly. Sing Core doors are the high-end solution used by the best millworks when it’s important to deliver the best door.

Enjoy the safety and security of a door that cannot be easily breached and is much safer for finger and limb injuries due to the lighter weight than conventional doors. Sing Core doors are available in any door configuration and/or size and available to all door manufacturers.

torsion box, sandwich panel, honeycomb panel, lightweight panelTypes of Doors

Sing Door Panels

Photo Galleries

How to Build

Patented Sing Core: We put a torsion box in the SIP panel to make it better. The other names for our panels include sandwich panel, honeycomb panel and lightweight panel.

Door Industry

Best Door in Manhattan

Manhattan Penthouse brings Sing Core Door to new heights.


Craned up to Manhattan highrise.
Click to enlarge


No place is too far.

This custom made trapezoid door traveled over 2,921 miles from coast to coast, now on final leg of its journey to its new home in upscale Manhattan apartment. We specialize in custom sizes, shapes and thickness to fit our customer’s needs, we offer the best guarantee in the door business. Best Custom Oversize Sliding Door in Manhattan

Door Closed Door Open
Door Open
Door Closed

Sing Punch-Proof Doors

SINGCORE-The new generation of door making it impossible to punch through and destroy.

As low as $50 a door for a door that will last a lifetime.

torsion box, sandwich panel, honeycomb panel, lightweight panel
Punch proof Sing Core door.
Typical paper core door. (click to see more)


What door companies do not want you to know.

Today, the most common doors found in private residences contain a paper core. These doors are flimsy and are easily punctured, even when slightly impacted. Owners of these doors find themselves spending time and money on repairs, replacements, and installations that would not have been an issue had they purchased a door from Singcore. Singcore doors do not cost much more than paper-core doors, yet they have been tested to be at least 49 times stronger.

Door Security

How secure are your doors? With our patented core, you can rest assured that our torsion box technology will stand up to harsh treatment and all weather conditions. Our doors have been thoroughly tested and have been proven to withstand the impact of a sledgehammer. There is no comparison between the stability, structure, and strength of Sing Core doors versus paper-core doors. http://singcore.com/images/GarageEcoStrong.jpghttp://singcore.com/images/GarageEcoStepThumb.jpg This is a Sing Overhead Garage Door Panel compared next to a typical steel overhead garage door panel. Same size and thickness but as you can see the steel panel buckles with only a few pounds put on it while the Sing Panel holds almost all of Inventor Peter Sings weight without any problem.

Stronger than Steel,

Lighter than Wood

Doors do not have to be made out of steel to be rigid and strong. Sing Core doors are stronger and lighter, than steel and vinyl doors. Standard steel overhead garage doors are made of steel so thin that a golf ball can dent it. This is not the case with Sing Core doors. We offer higher quality doors at prices competitive with steel doors with quality superior to wooden doors.

Sing Core doors are more stable, provide better insulation, and are far lighter than solid wood doors. The torsion-box core holds the Sing Core door flat, ensuring that that the panel will not warp and sag like ordinary wood.

Patented Sing Door Methods

Sing Core doors are versatile and customizable. Every order is custom designed with the client’s project in mind. Each door is constructed using methods that specifically cater to our customers’ individual needs. We construct our doors using the following methods: pole barn grade, paint grade, wood grain grade, and plank grade.

Click Here to Learn How to Build a Sing Door


How to Buy

Sing Door Panels are easy to order (link). You may select panels of standard dimensions from our inventory, or you may order custom sizes and shapes. Please submit a Work Order by fax or email, and we will get back to you with a free quote within one business day. You only need to submit the length, width, thickness and quantity. Even if you have an unorthodox idea or a tight budget, give us a call. Our representatives will help devise an alternative solution tailored to your needs. Sing Core allows you to design your own doors. Just add trim, paint, and hardware*. Exceptional pricing is available to distributors, manufacturers, and retailers . Doors Pamphlet For Distributors person-carriage-door-garage-sing-core

Door Panel Pricing

Simple Price/Order Process

Simple Price/Order Process

Sing Door Assembly  Sing Door Strength Demo

Large Oversized Doors

See the Sing Best Door definition Sing Core specializes in custom 1-off high-end large oversized doors, sliding doors and aluminum doors. Why? Because no other door manufacturers does huge eco-friendly doors better. The Sing Core Door manufacturing plant is set up especially to make doors that are up to 50 feet tall, yet true flat, lightweight and stronger than steel. Sliding-barn-doors-wine-brewery-lightweight-strength-eco-friendly-true-flat Huge doors present a variety of complications for designers and installers. Due to structural changes in the materials and changes in the physical environment. A door that appears to be a perfect fit at the time of installation, most likely will be a huge disappointment over time. This causes extraneous maintenance fees, loss of energy, and lack of long life requiring early replacement.

True Flat – Guaranteed
Sing Core is the only door manufacturer that can create eco-friendly doors that can be guaranteed true flat regardless of the size, and will not warp, twist or experience extreme deflection under stress. And, thanks to the lightweight properties in comparison to other solid materials available, Sing Core oversized doors though large in size, are lightweight, causing less strain on the structure and hardware. Sing Core doors are available in any height, any width, any thickness. Energy saving doors are becoming more important especially when considering doors of large size. Sing Core large oversize doors are extremely energy efficient due to built-in insulation that adds both energy saving and sound deadening properties. 3-sliding-exterior-doorsSing Core large doors are not only Eco-friendly, lightweight and stronger than steel, they are extremely affordable when compared to other lightweight but strong materials. The best-known, oldest, most reliable, high-end millworks in the United States depend on Sing Core to deliver the goods for them when it comes to large, oversize doors. Why? Because Sing Core large doors are the only oversized doors that can outperform any other door in terms of long-lasting satisfaction and guaranteed true flat. Just let us know your expectations and based on our expertise, we will be able to provide you with a solution that we can guarantee. Challenges of door manufacturing are based on three factors: 1. The skin (surface material) 2. The thickness 3. Door size Based on years of experience, we know how to manipulate those numbers to your best advantage to make certain that you get the results you desire. If you’re considering an immense large interior or exterior door, you should consider a Sing Core large oversize door that comes with a full 10-year structural warranty. Some of our design solutions include very large doors, like large French doors, large carriage doors, large closet doors, large cabinet doors, large guillotine doors and large front doors and in most cases to guarantee true flatness aluminum plays a part in the composite design. Sing Core oversized entry doors, oversized French doors, oversized front door, oversized interior doors, large glass doors, large patio doors and large entry doors by far exceed the requirements of any other doors available on the market today. When it comes to large exterior doors, large pocket door, large interior doors, large glass sliding doors, large garage doors or large wooden doors no other door manufacturers can deliver superior results, like Sing Core. Whether you’re considering a large sliding glass door, large wood doors, large sliding doors exterior, large shop doors, large opening doors or large pivot doors, Sing Core is your one-stop solution for your oversize door, guaranteed. Lightweight insulated door core 15' length

Sliding Door

Sing Core is the new way to design your door

Solid like a rock, light like feather so you don’t smash your finger.

One finger easy open lightweight sliding doors by Sing Core true flatIf your sliding doors are large, you probably have to deal with the issues of added weight that can be problematic. Lightweight Sing Core’s torsion-box substrate is the answer to dealing with the issues of weight of large sliding doors yet adds high structural integrity, and helps to prevent injury to the end-user(s). Wood sliding patio doors, sliding glass doors, and even the most high-fashion vinyl sliding patio door can be expertly engineered with patented Sing Core technology. Strengthening outdoor sliding doors and reducing the weight helps to protect and reduce maintenance to expensive sliding door hardware as well as added stress and strain on the structure. When considering your sliding door ideas, think about the size, the weight and the structural integrity of your sliding door system over time.


The Sing Core sliding door offers so much more than luxury, but also increases safety and security of the homeowner’s family, the contractors and workers, as traditional overweight sliding doors have been known to be unsafe and can cause injuries threatening life and limb. Reduce liability of your contractors and commercial clients by reducing on-the-job injuries and help to protect the lives of your clients and their families in residential settings. Even the best health insurance cannot replace a finger that has been crushed by a heavy sliding door.


When it comes to sliding doors for walk in closets, most people don’t recognize the importance of remaining true flat inside the pocket door frame. Whether you’re looking for a pocketed door system, wall-mounted system, hanging or floor track system, you can experience the superior performance of your single French door, fiberglass French door or exterior French door because you’ve been introduced to the best sliding French doors for sale on the market today. Exterior sliding barn doors can be beautiful following installation, but after time, problems develop due to door failure. They tend to expand and contract due to weather exposure causing them to warp, twist, and crack, compromising the overall performance of your sliding barn door system. Even a 1/4″ deflection can compromise an otherwise aesthetically pleasing completed project. Sing Core’s true flat guarantee is why high-end millworks and designers seek out Sing Core for extreme weather and temperature-controlled environments. For the do it yourselfer, DIY sliding closet doors can also be a challenge, and Sing Core can help to bridge the gap between the solo sliding door project. Sliding closet doors are gaining popularity amongst discerning builders and designers, while wooden sliding closet doors are extremely attractive, infusing Sing Core technology can save your interior sliding doors from warping, twisting and/or cracking, so that you can enjoy the elegance and functionality of your sliding door for lifetimes with little or no maintenance.

No company excels in building sliding doors that are much larger than the standard 8 foot sliding patio door. Sing Core specializes in building extreme oversize, large sliding doors that are true flat and guaranteed. When you’re designing a double sliding door system, the true flat advantages of Sing Core helps to maintain the structural integrity, keeps the sliding of the doors from interfering with the perfect functionality and long-term efficiency. And increase in interior design trends, like the wall mounted sliding door, Sing Core is the sliding doors company that can get your from here to there whether you are looking for a sliding door for bathroom, sliding barn door kits, sliding door dividers. Sing Core is your preferred resource if you want to avoid cheap sliding patio doors. Sliding fire doors are gaining popularity in the Sing Core sliding door lineup. Regardless of the wide variety of types of sliding doors, Sing Core offers the elegance and excellence in barn door sliding door, sliding office doors, and exotic sliding doors, like, Chinese sliding doors, sliding French doors exterior, Shoji screen sliding doors and/or Japanese style sliding doors. Barn door interior sliding doors come in a variety of materials that are virtually unlimited to match your aesthetic tastes including, aluminum patio sliding doors. Sing Core makes the best real sliding door that solves the challenges that face architects and designers around the world for the best results, guaranteed.

True Flat Oversize Doors

Sing Core 37 foot tall true flat doors

Sing Core 37 foot tall true flat doors

We guarantee that we are the only company in the world that can deliver true flat oversize doors that meet your expectations, if you desire a true flat solution, especially in the large, oversize door.

One of the biggest challenges we see from designers and developers is that of the oversize door. Sure, anyone could make an oversize door, but can you make one that is true flat, maintaining structural integrity over long spans? That’s where Sing Core shines.

3 Types of Oversize Doors

There are three types of oversize door solutions, and in terms of meeting or exceeding the needs of the most high-end clients in the world. Our specialty is solving the problems associated with large oversize doors, while maintaining true flatness under extreme circumstances is unheard of, Sing Core helps us achieve the results that no one else can and remain lightweight and Eco-friendly, too. 1. Large Oversize Wood Door The large oversize wood door has been a challenge for centuries because regardless of your expectations or requirements, the very nature of wood itself will provide additional challenges for both designer and the design. Not until the invention of Sing Core has there been a perfect solution for the issues associated with large oversize wood doors. See more information on Large Oversize Wood Doors. 2. Large Oversize Aluminum Door For more extreme oversize solutions the Sing Aluminum Door is the better solution, especially when doors are expected to remain true flat under varying conditions. Aluminum has certain attributes that help us reach and exceed the requirements of the most demanding high-end clients. See more information on Large Oversize Aluminum Doors. 3. Large Oversize Wood/Aluminum Composite The best solution for battling the issue of oversize without compromising the look, feel, beauty and elegance of solid wood is to call in the specialists at Sing Core to help design the perfect solution to your strictest concerns and requirements. See more information on Large Oversize Wood/Aluminum Composite. 4. Large Oversize FRP Composite Door If your large oversize door will be facing extreme weather conditions, temperature variations, or some other kind of added stress that might be above what would be considered normal exposure. Every day someone finds the Sing Core solution. For instance, when O.B. Williams needs a hundred oversize doors, that are guaranteed flat, who do they turn to? They call Sing Core to get the job done. Plus, you have all the advantages of patented Sing Core, with any appearance that you like i.e., aluminum or exotic wood grain finish… In a hurry? No problem. Sing Core can build your true-flat oversize doors for you in less than 3 days, even though our normal turnaround is 2 to 6 weeks. Sing Core’s got your back. We make you look good. When your client demands only the best… You can confidently use Sing Core as your resource, because when it comes to oversize, true flat, nothing else even comes close. Any look you desire… 13 foot lightweight panel strength peter sing coreOversize Sing Core doors can achieve any exterior surface your customer desires, including (but not limited to) any wood species you customer desires, concrete, fiberglass, aluminum, stainless steel, fire-resistant Magnesium Oxide (MgO) Board, bullet-proof Kevlar, etc… How do we do it? Oversize and true flat is a challenge that we take on every day. We know the perfect combination of patented sing core and aluminum, to maintain light weight, superior strength and true flat construction. This is how we build sustainable, high-end, true flat doors consistently and guaranteed for ten years.