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How Sing Core supports contemporary millworks and brings original architectural doors to life. Join top door producers in the country like Pella and Anderson Window and Doors to get on board with the SingCore revolution.

What we do:

We have helped millworks and high end door manufacturers to solve their production problems by providing massive amounts of door substrate to increase their productivity. Sing Core has the best and most efficient machines and technologies to provide the fastest delivery of the highest quality door panels in large quantities for our customers to build high end wood veneer doors, wood stave doors, even the strongest, lightweight, impact resistant, warp-free stile and rail door can start with Sing door substrate, then adding door trim molding to create this new generation of highly advanced door. Stronger, lightweight, warp-free, insulated, sound deadening doors in quantity at a much lower cost than your high-end conventional stile and rail door. Get a price quote, we will help you to improve your productivity without having to hire large production crews to meet your deadline. This is a much better solution as an alternative to conventional stile and rail door.

“We are here to support you.”

Our main business is building very large door substrates that are guaranteed to meet or exceed AWI standards.
You know everything. You know what you can do and you know where trouble is lurking. You don’t want your customers coming back to you, complaining about their door that has warped. 
You’re careful to exclude certain items, such as those largest of doors on your door schedule. You’ve been in the business to know that you are competent and courageous enough to build a magnificent big door, but you also know that problems are just around the corner.
You also know you have nothing to worry about if you take advantage of the

50-year Sing Core Warp-free Solution

Our relationship with our millworks is a tight bond, where we both work with and trust each other. We do our part: to provide you with the best, most efficiently engineered warp-free substrate, with the skin of your choice or not. You decide how much work you want to do on the door in your shop. And you: Make our product look so beautiful.
Neither of us could do this kind of work without the other. This is a symbiotic relationship that we only share with the biggest and best millworks in the world with honor and integrity every day.
We make the best team ever, and you can now offer your clients the best in large doors of any kind with the best guaranteed results in the world.

How to get a price quote:

It’s as easy as 1, 2, 3: Length, Width and Thickness of the door substrate. In one click you can see a shop drawing of the Sing Panel that you are looking to purchase.

Sing Core supplies valuable components to the construction process. Patented Sing panels, posts and beams are integrated into projects where the characteristics of lightweight, high strength, insulation and alternative Eco-friendly manufacturing options are either sought after or used in solving the problems associated with large scale projects.

The process works something, like this:

  1. The Architect specifies, “SingCore” inside the products, let’s say, a large pivot door
  2. The General Contractor seeks out a qualified Millwork who obtains unfinished pivot door from Sing Core
  3. Sing Core manufactures the pivot door blank to architectural specs and ships to millwork
  4. Millwork finishes and installs hardware and provides finished pivot door to the job site
  5. Installers hang and or install the pivot door
What we do the best…the best in the world:
We provide the  best substrate for the millwork and door industries to build the best door in the world. The core makes all the difference. If you use LVL core, wood stave core, particle board core, aluminum core, or paper core you should try Sing Core. Millworks know LVL and wood stave is too heavy and warps, aluminum honeycomb core has no precision  once the core is stretched, paper core is similar and offers very little support and no sheer strength. 
We supply our Sing Core door substrate to the largest door manufacturers to replace their door cores as mentioned previously. One of our largest customers said,

“Since we switched to Sing Core, we never have any warping issue, which was the biggest problem for recalls no matter how hard we tried to make our LVL cores work.”

1. For a highly smooth paint grade surface, such as lacquer finish. 1 with MDF skin, 2 with AB plywood as surface skin. They have one thing in common; no matter which skin you select, as long as it is artisan grade, it will be guaranteed for the flatness, lightweight, and high strength, which is the highest standard in the industry.
2. Veneer-ready artisan grade Sing substrate panels for doors or high end millwork.
3. Wood stave-ready.  By adding 1/8-inch to 3/8-inch hardwood to create a panel which looks and performs better than any solid wood or any other type of door core, guaranteed.
4. Metal door. Almost any metal, or non-metal skin can be use as Sing door finish material. It functions and looks better than any other method, such as welding, or use other type of frame technology. Sing metal panels are stronger pound for pound than any solid material, lighter in weight, and with the highest precision which means longer life span of the products.
5. Increase your productivity by using Sing door panels to replace stile and rail doors.
If you have a job with 10 different sizes and more than 40 doors which could easily jam up your production for days, if not for weeks, contact Sing Core. We could do it in less than 2 or 3 days and ship to you to add veneer, or add trim to make it look like stile and rail doors. Even the professional door maker could not tell the difference, but we guarantee your new type of veneer or stile and rail door will be stronger, lighter, and true flat. No other stile and rail door could perform like Sing Core. This is the reason Sing Core works with the most succesful high-end door manufacturers across the USA. 

Get Things Done Right the First Time

Millworks and door manufactures are rightfully wary about building and installing large or oversize wooden doors using traditional techniques. That’s why the top millworks in the country choose SingCore for challenging projects where they need to get things right the first time.

Guaranteed Warp-free for 50 Years

Here at SingCore we set the bar exceptionally high with a lengthy full structural guarantee that exceeds any other offered in the industry. This covers not only standard size door panels but oversize door panels exceeding 30′ in length.

Renowned for non-warping large doors, inventor Peter Sing’s patented and patent-pending building materials can do so much more. Patented SingCore is suitable for use in unsupported spans of almost any length with proper design support from our “True Flat” estimating team.

Strength of Sing Panel

Peter Sing’s miraculous material just boggles the mind, and is something that you have to get in your hands, or under your feet, to truly understand. Just look at this 13′ span, easily supporting the weight of a man without deflection at only 1″ thick. By including Sing Core in your next project, you may for the first time have complete confidence that your oversize door installation will stand the test of time, with no complaints from your clients.

The SingCore factory, located in the pristine forests of the Pacific Northwest, also builds posts and beams for use in other types of construction applications. They are just as lightweight and strong, if not stronger, than SingCore doors. Our specialty is devising a way to make your next project in to a success, no mater what it takes


Click photo to see 10 ft tall accordion door project details

Lightweight of Sing Panel

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.

Finish to Match Any Style

SingCore offers a huge variety of skin materials, that allows you to achieve any design goal or match any existing element to perfection. Our specialty is in door panels, no necessarily door finishing, which is why we prefer to work with millworks on expensive projects. And, we often refer our clients to local millworks when possible.


Surface lamination types include:

  • Veneer, any species
  • Wood stave, any species
  • Metal – cold rolled steel, hot rolled steel, aluminum, copper, other
  • HPL composites – Formica and Wilson Art
  • Specialty such as white board, black board, magnetic marker board
  • Veneer yourself (hot press ready)
  • Paint grade panels

Every lamination is eligible to receive Peter Sing’s iron clad 50 year guarantee.

Architects are increasingly specifying their large high-end hot pressed veneer panelized walls, features, and doors have Sing Core inside (accounting for about one-third of all our products which are sent to the greater New York-area). The contractors generally contact Sing Core directly first, due to being specified. Though Sing Core does not actually do the veneering. Sing Core provides the high precision substrate that is shipped 3,000 miles from the manufacturing location in Washington State, to the high end millwork in New York (or wherever the nearest hot press specialist is near the construction site) to do the veneering there. We Do Not Veneer

We always recommend using your local veneering professionals for custom veneer doors. We do not provide veneer or install it.  It is our policy to subcontract veneering jobs to the best veneering professionals in the USA.

If you offer hot-pressed veneer services or cold-press veneering to your clientele, your highest paying customers will gladly pay you more if your panels have Sing Core inside.

Hot-pressers Are More Successful and Profitable with Sing Core.

If you are a veneering professional, then we would like to work with you! Please contact us, we have plenty of veneering jobs to subcontract out.

For standard sized doors, we send our premium substrate to veneering professionals near the job site to be hot-pressed.  If the doors are very large, we may have the veneering professionals prepare the veneer for us to cold-press in our facility.

For years, Sing Core has been providing high-end local and nationwide hot press veneer professionals with premium core material that eliminates the need for crossbanding.


Window Openings, French Doors, Man Doors, and Exotic Styles

Our perfectly straight true flat material is capable of fitting in to any form of door. Door openings are flexible and fully custom. Need a curved door? We can make you a custom curved door. Man doors? French Door? Other?


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.

Perfect edges ready for the top floor of the World Trade Center



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.


Low VOA and Warp Free

Our friends at Crestmark Architectural Millwork found SingCore to be particularly useful in large cabinet doors for the Museum of Modern Art. Our warp free oversize panels combined perfectly with the museums need for low VOA materials for archival room use.


SingCore has been used by the Seattle AIA for their flat back style office furniture. Unlike overseas competitors, who focus on quantity of quality, or furniture panels are designed and built to last a century or more. This makes sing core the go to companion for high end yet functional furniture installations. Coming it at 1/3rd the weight of all wood panels, SingCore is extremely popular in the modular or moveable furniture space.

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.

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.

Can you afford to go without SingCore on your next project?


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Lightweight Strong 3/4 inch MDF Torsion Box Cabinetry Panels

Sing Sandwich cutaway exposing patented Sing CorePatented Sing Core is bringing the latest development in lightweight and high strength technology to visit the cabinet industry. Imagine being able to use a lightweight building material that is commensurate with high-tech aerospace technology at 20 percent of the price.

This new cabinetry alternative to MDF 4×8 sheets delivers many times the strength of solid MDF at a fraction of the weight with no headaches. Sing MDF cabinetry panels come in 4×8 and 5×12 sizes in convenient 3/4 inch thickness.

How are 3/4 inch Sing cabinetry panels made?

Start with patented Sing torsion box (2×3 inch grid size) where the voids are filled with recycled rigid foam insulation wall to wall with and sandwich it all between two sheets of 1/8 inch MDF and bond it altogether with formaldehyde-free adhesives for an Eco-friendly lightweight high strength composite MDF panels that out performs any other lightweight building material in terms of strength, weight and longevity.

Compare to other lightweight panel material

Compared to any other lightweight panel building material, like honeycomb panels made of paper honeycomb, aluminum honeycomb, cardboard, or even high-tech aerospace panels (costing five times as much per sheet) Sing 3/4 inch cabinetry panels are a bargain at twice the price.

Secret Ingredient Inside

High precision lightweight high strength warp resistant insulated reinforced torsion box Sing Core high performanceThe secret ingredient inside the Sing 3/4 inch cabinetry panels is the torsion box composite core that is the same product used by the US Navy and other high tech industrial applications where strength and weight are both considerations. This is the same technology used to build large doors – of any size or style – that can be guaranteed not to warp, bend, twist or otherwise fail for a full 50- years.

Imagine having this material inside your cabinetry and/or furniture… Say, “goodbye,” to disposable furniture and heavy cabinetry which are highly desirable qualities sought in aircraft, marine and recreational vehicle platforms for both less weight and less maintenance over time.

Lightweight high performance cabinetmaking material

Lightweight Sing Bookcases

Lightweight Sing Bookcases

Even though plywood and particleboard are fairly standard fare in cabinet shops around the world, certain high end cabinet makers are seeking to embrace this new technology which is the perfect combination of old (torsion box) and new (composite) fine woodworking craftsmanship. Plus (as you undoubtedly already know) both plywood and particle board are heavy and prone to warp and rot; unlike Sing 3/4 inch torsion box cabinetry panels.

Structural integrity

The structural integrity of these hybrid cabinetry panels surpasses anything know in the affordable lightweight composite material and is increasingly finding its place amongst the transportation and general construction categories as an impressive upgrade alternative to plywood or other materials.

Built-in insulation

Sing composite cabinetry panels feature built in insulation (the rigid foam insulation filling the torsion box voids) that is a unique added feature whether you are building cabinets and/or other furniture.

Easy to work with

Standard woodworking tools are all that is required to take full advantage of Sing cabinetry panels, treat them just like you would any standard 4×8 piece of 3/4 inch panel.
Sing cabinetry panels are revolutionizing the industry as they are increasingly being found as a standard commodity in cabinet shops, millworks and furniture manufacturers throughout the United States and the world.


Sing cabinetry panels have unfinished (exposed, i.e. you can see the core) edges. This is easily remedied by adding edge trim, or closing the edge by any method desired. Also, the core material can easily be routered to accommodate insertion of wood implants where desired or necessary.

Simply CNC router out Sing Cabinetry Panels to insert any desired material.

Made in the USA

Eco-friendly Sing cabinetry panels are proudly made in the USA