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How Sing Core supports contemporary architecture and brings original architectural doors to life.

Why Specify Sing Core?

The primary reason top architectural firms specify Sing Core in their specs is for large doors because every door over three-and-a-half ft. wide or seven ft. tall is going to have a problem with warping, and Sing Core is the only way to build an Eco-friendly lightweight high strength fully insulated door which can be

Guaranteed Warp-free for 50 Years

This sets the bar extremely high, and when architects want to deliver the best for their particular high-end clientele, as specifying “Sing Core inside” elevates the project to an entirely new level.

Renowned for non-warping large doors, inventor Peter Sing’s patented and patent-pending building materials can do so much more. Next up on the list of reasons why architects seek Sing’s materials out for their upcoming projects includes lightweight dimensional stability and unsupported spans.

Here, Sing stands amidst a 13 ft. one-inch thick panel between two sawhorses, and you know if he were standing on any other building material, he would be standing on the ground. Yet, there he is suspended with little or no deflection. It boggles the mind, the possibilities of Sing’s core.

And Sing’s factory, located in the pristine forest region of the Pacific Northwest builds more than panels. He also builds posts and beams for use in other types of construction applications, which are just as lightweight and strong, if not stronger.

How Strong is Sing’s Core?

Independently tested, Sing’s core is 660 PSI, many times stronger when compared to any other lightweight honeycomb-type building material which usually clocks in at between 10 and 110 PSI.

That’s why you will find Sing Core inside impact doors. Sing says, “If you kick other doors, they will crash,

“Kick my door and you will break your leg.”

While lightweight and fully insulated, Sing Core is stronger that steel pound for pound.


Architectural Lamination

When it comes to architectural designs using high precision lamination, Sing’s factory and his high precision laminating specialists provide top of the line results with unparalleled visual impact.

Laminates can be mixed and matched in any specified pattern, orientation, or specific shapes. In fact, Sing’s stile and rail surface lamination makes his high-end door blanks look like a high precision stile and rail door, for which he is well known for in the industry.

Sing’s lamination is also included in his no-fail 50-year guarantee.

Any Surface Material

Due to Sing’s True Flat Team’s ability to keep any surface material straight and true, you will find them constantly hard at work designing the warp-free components to keep solid wood stave straight and true for 50 years, though their expertise is not limited to unstable wood grains.


Nearly any available flat building material can be incorporated with Sing’s core, including exotic natural wood grains, aluminum, brass, brick, bronze, cement, cold rolled steel, concrete, diamond plate steel, fiberglass, Formica, FRP, galvanized steel, hot rolled steel, HPL, Kevlar, Masonite, or stainless steel, just to name a few. That should get your creative juices flowing.

But there’s more

Any Size

Due to the incredible light weight of Sing Core and super strong resilience, the largest doors in the tallest buildings in the United States are built with Sing Core inside.


us-navy-singcoreThe last thing you want on the top floor of the World Trade Center, is a warped door, and that’s why you’ll find Sing Core inside those doors.

You could find Sing Core from beneath the depths of the sea (US Navy) to outer space (NASA) and everywhere in between.

Any Application

There’s no doubt you will find Sing Core inside the finest oversized large doors, but you may find Sing’s core inside any item that is lighter in weight but expected to be used over and over again over a long life span.


You will find Sing Core inside 100-year furniture (that’s furniture that is designed and built to last for a hundred years). This is in stark contrast to more popular inexpensive import furniture which is expected to be basically disposable.

You will discover new and varied ways to use Sing’s patented and patent-pending technologies for signage, floors, walls, ceilings, emergency shelters, modular work sheds, tiny houses, museum displays, store fixtures, and modular trade show booths which are designed to be knocked down and rebuilt over and over again for years on end.

A variety of travel industries are benefited by using Sing’s technologies, including, but not limited to hospitality, aircraft, aerospace, marine, rail, trucks, trailers, and RVs.


Even entire homes have built of Sing’s patented Sing Core.

See a wide range of Sing Applications.


Most Sustainability of Any Other Building Material

Peter Sing’s gift to the world is this highly sustainable product which can virtually last forever with little or no deterioration, and can be repurposed on the fly, making it possibly the most sustainable building material in the world.

Shouldn’t you be specifying Sing Core inside your most important projects?


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Architectural Flush Wood Door

Working hand in hand with architects, door engineers, designers, millworks, and custom door manufacturers to help create one of a kind architectural flush wood door works of art is the everyday activity that goes on inside inventor Peter Sing’s factory nestled safely within the pristine Pacific Northwest.

Yes, you can get an architecturally inspired standard flush wood door off the shelf, but that’s not the same as a real architectural flush wood door. An authentic architectural flush wood door is a wooden flush door that is highly prestigious and unique, unlike any other door. That is, unless, you are specifying 700 matching doors to synchronize and tie into the location’s aesthetic design. Still, they would be individually unique to that specific location.

Architectural doors are art. Just like you can get copies of art to hang on your wall, you can get copies of architectural flush wood doors to hang in your door opening, but the copy is not the same as the original, and a keen eye can tell the difference.

Some clientele would never settle for hanging art that wasn’t an original piece.

Architectural flush wood doors are comprised of many materials combined in unique ways to create a unique door that is unlike any other. An architectural door designer might mix different wood grains in a unique design pattern on the flush door’s surface to create such an individual work of art.

The architectural door artist may also combine different materials into the door’s design, such as, wood, metal, and glass. Other materials, such as aluminum, brick, cement, copper, fiberglass, hot rolled steel, laminates of all varieties, plastics, and stainless steel, just to name a few of the most popular.

The best architectural flush wood door is a composite of many materials, and nobody know the intricacies of precision bonding many different materials together, all working in unison of the whole, all the (and here’s the kicker) while,

Remaining Perfectly Straight for 50 Years

than inventor, Peter Sing, who provides his patented and patent-pending architectural flush wood door technologies which are revolutionizing the way architectural doors are made.

The biggest and best architectural wood doors are large oversized flush architectural grade commercial doors, that can be very large, up to 50 ft tall or wide. (That’s a big door.) As you may have guessed, especially if you have some experience with any doors which are oversized, that keeping it straight is going to be a problem.


Any large door, over 7 ft tall or three-and-a-half ft wide, is going to present a problem with moving over time and the problems are exponentially worse if you’re dealing with a natural wood grain door. Due to the nature of natural wood, it expands and contracts in accordance with changes in the environment which results in the door warping, bending, twisting, or cupping.

Left to its own devices, such a large door will be problematic for the end user, requiring regular maintenance to deal with its propensity to move. That is, unless it has

Sing Core Inside

Patented Sing Core enables all the greatest door companies in the world to build enormous doors which will remain warp-free, even if they are constructed of natural wood species.

10×12 ft 3″ thick warp-free 1/8″ oak 520 lbs

Of course, contemporary architecture and modern designers have resorted to using non-natural faux wood grain materials such as HPL to prevent the warping of architectural flush wood doors, but even so, those incredibly large doors still presented a problem with staying straight.

Sing’s patented and patent-pending warp-free door solutions along with the years of technical expertise of his True Flat Team, can help create high precisions architectural doors results unsurpassed by any previously available door-building technologies.

These new leading-edge door manufacturing processes and anti-warp materials are able to produce doors of any size, made of any flat building material (yes, even natural woods) which can be covered by Sing’s unprecedented,

50-year Warp-free Guarantee

All Sing’s premium flush wood doors are covered by his 50-year guarantee which covers any movement, as doors made with these technologies with not warp, bend, twist, cup, or otherwise fail (including structure and delamination) for 50 years.

No other company can offer such a guarantee on an Eco-friendly, lightweight, high-strength wooden flush door.

Added Architectural Benefits

Besides being warp-free and having the best and most long-lasting guarantee in the world, architectural doors that have sing Core inside also have many other extraordinary characteristics, such as

1. Lightweight

Architectural doors made with Sing Core inside are 1/3 the weight of other solid core doors manufactured with wood-based door cores. Creating doors so light in weight is extremely advantageous in reducing transportation and installation costs, as well as reducing the expense of heavy-duty architectural door hardware which is based on the weight of the door. A lighter weight door also translates to reduced maintenance costs related to regular door operation which if the door is heavier will increase stress and strain on both the structure and its hardware over time.

2. High Strength

No other Eco-friendly, lightweight door is stronger than an architectural door with Sing Core inside as these are the only doors which are stronger than steel pound for pound, independently architecturally rated by University at 660+PSI (many times stronger than commercial honeycombs used in aerospace at 10 to 110 PSI), making them the most sustainable doors known to man on planet Earth.

3. Fully Insulated

Even if your primary interest is having an architectural wood door that is straight and true, you might be pleasantly surprised that these are fully insulated for climate control (R 3.5 – R 6.5, or more, depending on architectural specs) and sport impressive sound deadening capabilities. It is not uncommon to find Sing Core inside the best soundproof doors in the most exclusive locations around the world in sound-controlled environments.

4. Solid as a Rock

One look at Sing’s site and you will see many demonstrations of just how strong his lightweight panels are. In one demonstration he is standing in the middle of a 13-foot-long 1-inch-thick panel suspended between two sawhorses with little or no deflection (any other panel would have you crashing to the ground). Another example shows two men standing amidst a 20-foot span. Sing says if you kick a standard stile and rail door, it will break, but,

“If you kick my door, you will break your leg”

first, before you break his door.

You should think about specifying Sing Core inside all your important architectural door projects.

Submit a price quote request today.

Architectural Wood Flush Door Photos


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Wholesale Large Door Alternatives for the Best Door Manufacturers

The best door distributers represent the best in trusted door manufacturers across America for high confidence and superior door manufacturing ethics which translate to high quality and performance standards for upholding your credibility and professional ability to deliver only the best doors for your clientele.

What About Large Doors?

If you are like other distributors of the top selling doors from companies like VT Industries, you are getting some of the most coveted door jobs in your area of expertise. That is, for everything within the standard door size-range. Large doors are another thing altogether.

Large Doors

Large doors in your door schedule are going to be a problem. First off, your regular door supplier does not carry them, doesn’t want to build them, and doesn’t want you to sell them.


Because large doors fail. Even in the best of circumstances, with all the talent and expertise in making and installing millions of standard-sized doors, your supplier is unable to provide you with a door that will not fail after installation if its dimensions exceed 4×8.

Any door over 4×8 is going to present your valued client with problems. This is why large oversized doors are excluded from your standard warranty which covers the rest of the door schedule, because everyone knows that a large door will warp if it is over 4×8.

Where Does Your Door Supplier Go for Large Doors?

Every once and a while your door manufacturer takes on a large door job, which may include hundreds of standard-sized doors and a few large pivot doors, large sliding doors, or large hinge doors. What then? They don’t want to lose the job due to only a few large doors.  

So, what do they do?

The biggest and best door manufacturers in the world know there is only one trusted door manufacturer in the world that can make a large door that will not warp, bend, twist, cup, or otherwise fail, and that is Sing Core.

Sing Core Warp-free Large Oversized Doors

Enter Sing Core, the only large architectural door manufacturer in the United States who can build a large oversized door of any type or style that can build a large door of any material specified by your architect that can be lightweight, high strength, fully insulated, and can be guaranteed warp-free, not to fail, including a full structure warranty for fifty years.

Made in the USA

Sing Core doors are sustainable Eco-friendly doors which are proudly made by hand using safe domestic materials via our patented manufacturing methods using less energy, with very little waste, and a highly honorable respect for managing the best of nature’s materials and recycled materials for long almost service-free long life now and for generations to come.

Sing Core Door Characteristics

Besides being lightweight, warp-free, and stronger than steel pound for pound, Sing Core Eco-friendly doors bring many other high-end attributes to the end product which will be enjoyed by your clientele for years to come, adding even more value to your Sing Core door.

Some of the advantages of having a Sing Core door include being fully insulated for climate control and sound deadening qualities thanks to the high-precision (+/- .006 in. tolerance) patented and patent pending composite reinforced door core.

We Don’t Make Doors

Even though the best doors in the world are made with Sing Core inside, we don’t actually make doors at all. What we build is the best non-warping insulated door blanks in the world. We work hand-in-hand with the best door manufacturers in the world to provide your clients with the best doors in the world of any size, even huge mammoth-sized doors.

In this arrangement, as we help support the best door builders, we provide them with the non-warping substrate (what we do best) as we trust them with handling the door finishing, hardware, and installation (what they do best).

What We Can Do

We do provide your biggest and best door manufacturers with the best support system and can provide them with door blanks in various stages of readiness for them to complete in their door factories.

We are often called upon to make bulk runs of standard door blanks quickly, provide door builders with ready-to-finish door blanks prepared by attaching any available flat building materials, such as any species of natural wood grain veneer, natural wood planks, aluminum, cold rolled steel, concrete, fiberglass, FRP, galvanized steel, hot rolled steel, HPL, LVL, MDF, MDO, plywood, stainless steel, just to name a few, ready for your favorite door manufacturer or millwork to finish.

What We Can Do for You

If you have a good local custom door manufacturer or millwork that you work with locally you can order your Sing Core door blanks and have them sent directly to your favorite millwork or custom door maker for finishing, installation of hardware, and installation.

How to Get a Sing Door

You can get your Sing Door blank custom built to your architectural specifications by clicking on the orange Pricing button at the top of the page.

Thank you for supporting Sing Core

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High Precision Doors

Foam-Panel-Interior-Structural-Torsion-Box-Sing-Core-RevealedSing High Precision Doors are a marked improvement in door development, design and implementation thanks to a newly invented Eco-friendly core material that is lightweight, insulated and stronger than steel pound for pound.

This new technology is revolutionizing the door industry especially in regards to large oversize doors. Architects, designers, mill works and door manufacturers all experience problems with doors that are larger than normal size.

Large doors present a variety of challenges in areas, like:

  1. choice of available materials
  2. lightweight doors are weak and tend to fail
  3. Copper-Doorheavy doors strain hardware and structure
  4. increased regular maintenance
  5. failure due to warping

Sing High Precision Doors solve all these issues with an Eco-friendly insulated solution.

How high precision are Sing High Precision Doors?

Sing High Precision doors are created with so much accuracy that the original door slabs are perfectly flat within .0006 inch accuracy.

After applying your desired composite materials and/or skin, your high precision door can be laser CNC machined for a perfectly flat surface, limited only by the accuracy of your CNC machine shop capabilities.

The Large Challenge

Certainly, you could use laser CNC cutting and engraving to machine nearly any door made of almost any commonly used door material for a flat result. The challenge comes from standing the door upright and expecting a degree of effective usefulness over time.

lightweight high strength engineered plywood for making large sliding doors aluminumWhy Large Doors Fail

The effects of gravity, varying degrees of moisture and/or atmospheric change, and the natural limitations of the characteristics of the building materials that comprise the door all contribute to its failure. This causes dissatisfaction for the end user, who has invested a great deal of expense in the design, manufacture and installation of this specialty large door.

Door warping is the number one problem for oversized doors that are otherwise enjoyed by the most discriminating end users.

The Disappointment

No one wants to spend that kind of money on a door that is going to warp, bend, twist, delaminate or compromise the structure or hardware with normal recommended use.

Now, here’s the exciting part…

Sing High Precision Doors can be guaranteed not to warp, bend twist or otherwise fail for 50 years!

large-lightweight-high-strength-garage-carriage-doorsImagine having a large door that can be installed that will not pave the way for repeated service calls over the life of the door.

Take a look at some of our clients who trust us with those difficult door challenges because they are the most reputable high performers in the industry who only deliver the highest marks in terms of customer satisfaction, especially now that they can deliver a fail-free large door that will not cause frustration for their client’s or their service departments. See clients List.

Highest Precision in Doors


Click Image for True Flat

high precision doors laser accuracyNo other building material can be guaranteed to maintain a true flat surface and milled with laser precision for long-term maintenance-free performance for 50 years. This is why you can find the growing demand for the Sing solution from beneath the sea (US Navy) to outer space (NASA) and everywhere in between.

The high precision Sing solution is not just for doors; turned flat these very same Sing Panels can become floors, tables, counter tops, ceilings and roofs. Turned on their sides, these patented panels become walls, moveable partitions or virtually any other type of application.

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Contents of Sing Door

Applications -> Building Components -> Doors -> Contents

Door Products

Sing Door Core

Sing Door Sandwich

Sing Door Panel

Door Applications

Interior Doors

Exterior Doors

Single Leaf Door

Flush Door

Moulded Door

Composite Door

French Door

Panel Door

Stile and Rail

Plank and Batten Door

Ledged and Braced Door

Frame and Filled Door

Wicket Door

Sliding Door

Glass Sliding Door

Bypass Door

Pocket Doors

Barn Door

Interior Barn Door

Ledge and Brace Door


Door Alternatives

Fiberglass Doors

Aluminum Doors

Steel Doors



Rotating Door

Pivot Door

Revolving Door


High Speed Door

Clean Room Door

Refrigeration / Cold Room Door


Blind Door

Gibb (Jib) Door

False Door

Invisible Door


Half Door

Dutch Door

Stable Door


Double Leaf Door

French Door

Garden Door

Rebated Door

Australian Door (double plywood swing doors)

Barn Door


Saloon Doors

Café Doors

Batwing Door


Bi-fold Doors


Garage Doors

Carriage Doors

Overhead Door

Sectional Overhead Door

Roller (Tambour) Door

Roller Shutter


Specialized Doors

Sound Proof Door

Fire Door

Impact Resistant Door

Extreme Weather Door

Weather-proof Watertight Wood Doors

Bulletproof Door

Blast Door

Trap Door

Pet Door


Architectural Doors


Sing Door Data

Types of Wood Doors

Door Blanks

Skin Options

Technical Information

Clients List

Industrial Links

Assembly & Connection

Door Frequently Asked Questions

Door Specifications


Photo Galleries

Carriage Doors Gallery

Sliding/Pocket Doors Gallery

Interior Doors Gallery

Exterior Doors Gallery

Overhead Doors Gallery


How to Build

How to build a true flat door

How We Build Our Doors (The Best Method)

How We Build Our Doors (The Second Best Method)

How to make a Sing Door with glass

Carriage Doors

Sliding/Pocket Doors

Sliding Glass Doors & French Doors

Stile and Rail Doors

Interior Doors

Exterior Doors

Overhead Garage Doors


Sing Door News

New Door Tech vs. Old Door Tech

True Raised Panel Door

True Flat Sliding Doors

Sing Modern Sliding Barn Door

More People Switching from Overhead Garage Doors to Carriage Doors

$58 Door vs $580 Door Comparison

3 Types of Large Wood Grain Doors

New Doormaking Technology

Best Door in Manhattan

Architectural Specification Substitutes

Free Custom Window Glass Openings


Door Cores

Hollow Core

Lattice Core

Honeycomb Core

Corrugated Cardboard Core


Sing Core

Stave Core

Solid Core

Particle Board


Door Skins










Door Sizes

Standard: 36” x 80”

Exterior and Passage: 2’ 6” to 3’ wide x 6’ 8” height

Closets: (vary)

Oversize / Large Door: 8′ + tall and/or 4′ + wide

Garage: 7’ to 8’ wide

Double-car: 16’ wide


Door Hardware





Door Handles


Crash / Panic Bars

Pull Handle

Door Fasteners

Door Locks





Strike plate

Sliding Hardware

Sliding Door

Sliding Barn Door

Pocket Door

Wall Mount




Door Closer

Door Opener

Door Damper

Door Knockers

Finger Plate

Letter Box / Mail Slot


Door Safety

Door Stops

Door Guards