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Exterior Door Blanks

Singcoretabletop Patented SingCore makes the best exterior door blanks in the United States of America. Architects, designers, contractors, millworks and door companies come to SingCore for exterior door blanks that outperform other door blanks used in exterior doors.

Why SingCore Exterior Door Blanks?

The answer is

If you want the best exterior door
Start with the best exterior door core

insulated exterior bi fold warp free door blanks stringer than steelSingCore exterior door blanks are the only door substrate with SingCore inside. Exterior doors of any size with SingCore inside are lightweight, high strength, insulated exterior doors that can be made with any door skin material, including outdoor wooden doors that can be guaranteed not to warp, bend, twist or otherwise fail for fifty years.

Oversized Entry Doors

When it comes to large oversized doors, Sing door blanks help high end millworks and door companies to supply their clients with the biggest doors with full confidence of providing a oversized exterior that will not fail. Until SingCore exterior door blanks, the common response of door manufacturers was

We don’t build oversized doors

Lightweight high strength reclaimed cedar carriage doorsLarge doors were any door over seven feet tall or three-and-a-half feet wide. Why? Because they warp; but if they were built not to warp they would be too heavy, causing regular maintenance calls for hardware repair and the heavy door caused extra stress and strain on the both the structure and the frame. Either way, big doors were a headache for both the door company and the end user.

When using Sing exterior door blanks, any exterior doors – even exterior wood doors – can be guaranteed not to fail for 50 years.

Outdoor Wooden Doors

A wood exterior door is problematic due to the nature of the wood grain itself. The grain will either expand or contract due to changes in the environment and change in temperature or moisture will cause the wood to move this way or that. Moving or warping exterior wood doors compromise the door seal, and could prevent the exterior door from latching properly, or in extreme cases, closing at all.

copper door skin exterior door blanks oversized entry doorsSing exterior door blanks are wood door skin panels that prevent the failure of any door regardless of exposure to the elements if made with professional warp-free SingCore with wood stave applied using the patented non-warping process.

Door Skin

Patented SingCore can host any exterior door skin material – not just solid wood stave – a welcomed feature to any designer or full service custom door builder. Sind you are not limited to wood door skin panels, your doors can be made of any flat building material, such as aluminum, cold rolled steel, concrete, copper, fiberglass/FRP, galvanized steel, hot rolled steel, HPL, Kevlar, LVL, metal or stainless steel, just to name a few.

Of course, now you can make doors of any available natural wood species warp-free with SingCore inside.

Insulated Exterior Doors

Another unique feature and added benefit of having SingCore inside your oversized entry doors is being able to enjoy having insulated exterior doors which means better energy savings and climate control. Also, because Sing exterior door blanks are packed wall to wall with rigid insulation as part of the torsion box composite solid door blank adding sound dampening qualities for added safety and security at no extra charge; all part of the design.

wood door skin blank door oversized entry doors exterior door blanksSolid Core Door Blanks

Sing exterior door blanks are a solid core door material made of natural vertical wood grain torsion box/foam composite yielding exceptional displays of strength with unparalleled resistance to deflection and warping. SingCore is so strong, that it was rated at over 660 PSI when independently tested by the University of Washington. That’s stronger than steel, pound for pound.

The inventor says, “Kick any other door and you break the door. Kick a Sing door and break your leg.”

Don’t break a leg, but do specify “SingCore inside,” when you want the best exterior door of any size that is insulated, lightweight, high strength and can be guaranteed for a full fifty years.

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Standard Door Width Door Core

standard door width door blanks with SingCore inside 36x96 insulated torsion box door core birch skinBy popular demand SingCore introduces patented door core in economical and easy-to-use standard door width door blanks.

Until now, these SingCore standard door width door blanks were only available to high end door manufacturers making exotic doors for multimillion dollar homes. Some of the large entry doors can run as high as $50,000.00 or more. What happens when the owner of a mansion wants the doors throughout the whole house made with the same SingCore throughout the whole house?

We make standard door width door blanks for the door manufacturers to use in their door manufacturing facility.

Now, all the doors can match, with the same appearance and finish while having SingCore inside.

The Sing Standard Door Width Door Blank is conveniently sized for standard-sized door manufacturers. Every Sing Standard Door Width Door Blank measures 36 inches wide and a full 96 inches tall to accommodate all the most popular door sizes made by manufacturers of standard size doors.

The standard door width material measures 36x96x1.5 inches, features 1/4 inch smooth Birch skins and accommodates the manufacturing of all the most popular interior door sizes as well as standard exterior door sizes:

30 x 80 Exterior Door 30 x 80 Interior Door
32 x 80 Exterior Door 32 x 80 Interior Door
36 x 80 Exterior Door 36 x 80 Interior Door
36 x 84 Exterior Door 36 x 84 Interior Door
30 x 78 Exterior Door 30 x 78 Interior Door
32 x 76 Exterior Door 32 x 76 Interior Door
32 x 78 Exterior Door 32 x 78 Interior Door
36 x 96 Exterior Door 36 x 96 Interior Door
28 x 80 Exterior Door 28 x 80 Interior Door
26 x 80 Exterior Door 26 x 80 Interior Door
Standard door width 96x36 door blank for high end door manufacturers wholesale insulated lightweight

Sing standard door width door blanks are cut to size by the millwork or door manufacturer and used as a high end alternative to standard door core material.

Sing  Standard Door Width Blank Sizes

Standard sizes available of Sing standard door width blanks include 96 inches x 36 inches, in your choice of four thicknesses, including 1.5 inch, 1.375 inch, 1 inch and 3/4 inch to suit your door making needs, or for use in other applications also.

Ultimate stile and Rail Alternative

Upscale door manufacturers are seeing the Sing light and looking at new ways to reimagine the way they make their traditional stile and rail doors. Now you can create a true raised 6 panel door the SingCore way by staring with a Sing standard door width door blank and cutting it to size. Then add wood frame and final skin, finishing, hand and install for s superior insulated (sound deadening), lightweight, high strength door that can be guaranteed not to warp or structurally fail for 50 years.

Examples of molding added to Sing Sandwich Panels


Patented SingCore inside standard door width 36x96 door blanks stress skin 2x3 torsion box rigid insulationWhy Use SingCore Inside Standard Door Width Doors?

The only way to keep any large oversized door from warping or otherwise failing is to make the large door with SingCore inside as this is the only method providing a full 50 year warp-free guarantee, but that’s not the only reason SingCore is specified by the most prestigious architects or requested by demanding clients specifying doors with SingCore inside.

SingCore Door Characteristics

The world’s best and most expensive doors that have SingCore inside are imbued with unique characteristics that are more commonly requested by luxury homeowners of mansions, like Eco –friendly, lightweight, high strength, warp-free, insulated and fully guaranteed. Here’s why:


Helping door manufacturers deliver high end doors that are lighter in weight than standard solid doors, means less labor and risk of injury on the job site. Also, it equates to increased economy and reduction of service calls due to hardware failure due to added stress and strain on both the structure and hardware due to heavy weight doors.

High strength

Standard door width door blanks with SingCore inside for added strength and lightweightNo light weight door core material is stronger. In fact SingCore has been independently tested and rated at 660 PSI, that’s stronger than steel pound for pound, which also enables SingCore doors to be made…


Patented SingCore doors can be made to be warp-free using composite technology of SingCore and patent pending warp-free technologies that can be guaranteed to remain warp-free and be fully guaranteed for full structural integrity for 50 years.


The patented insulated reinforced torsion box core is packed with insulation that offers the benefits of both greater climate control and sound-deadening qualities on either side of the door with SingCore inside.

More Affordable

Thanks to the increasing demand of SingCore standard door width door blanks, we have decided to set-up standard production lines to make this convenient door core commodity available to all professional door makers who would like to offer these high end doors to their clientele.

Because we can make and ship SingCore standard door width door blanks by the truckload, we have these Birch-skinned 36 x 96 x 1.5 inch patented door cores available at lower wholesale prices for use and standard door making material in any door factory.

Custom Door Blanks

Of course, we always are available to all millworks and door manufacturers, to help provide the best door manufacturing assistance available. Our convenient OEM services can provide additional levels of support on large orders, where we can do much of the pre-fab-work for you, in advance.

Feel free to order high end one-off, or in bulk, your door blanks can be made-to-size and pre-skinned in any exterior material, like any available wood species, aluminum, concrete, fiberglass, glass, HPL, Kevlar, LVL, MDF, metal, plastic, cold rolled steel, hot rolled steel, galvanized steel or stainless steel, just to name a few.


Other Standard Products Available

SingCore is announcing more standard products available for construction, furniture and casegoods manufacture, including

48”x96”x1.5” Standard full size Sing Sandwich
24”x96”x1.5” Standard 2×8 Sing Sandwich
48”x96”x.75” Standard full size Sing Engineered Plywood
24”x96”x.75” Standard 2×8 Sing Engineered Plywood

All the other standard products include the same SingCore Inside benefits.

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Solid Wood Stave Door Blanks

Applications -> Building Components -> Doors -> Solid Wood Blank Doors
solid wood stave sliding door wood planks composite honeycomb panels

Click on picture to see our wood skin gallery!

Our panels make doors!

Patented Sing Core solid wood stave door blanks feature the newest technology in the door industry for composite doors yielding the only eco-friendly, lightweight, fully insulated, high-strength doors with wood blanks of any size (up to 40 ft.) that can be guaranteed true flat and to stay flat for 50 years.

Large door versus regular-size door challenge (i.e., over 4 feet wide and over 8 feet in length):

Large doors are heavy, dimensionally unstable, require more strength due to the heavy weight, and are a challenge to manufacture, ship and install.  High-end jobs require precision and true flatness to please the customer.  A homeowner’s architect, general contractor and mill worker must solve the problem of warping doors.  The solution to the challenge is to use patented professional true flat Sing panels to make your doors.

Sing Core wood stave door planks are the only solid wood doors that will not warp, bend, twist or cup following installation.  This means no more continuous service calls for maintenance of big doors that cannot possibly stay straight due to the limitations of solid wood – or any other door core – that is subject to failure.  Sing panels have a patented honeycomb/torsion box interior which gives lightweight yet unsurpassed strength (pound-per-pound stronger than steel) and stability to any door, and allows Sing Core to provide a 50-year guarantee

Interior Doors:

Sing panels make amazing designer doors in any style.  With Sing panels, fragile doors such as French doors are made lightweight yet strong, not warping or breaking hinges, which will last for many decades.

Exterior Doors:

Sing panels make sturdy exterior doors in any style.  With Sing panels, exterior doors are lightweight and strong, even when oversized.  Our professional doors are guaranteed to stay true flat and not warp or twist for 50 years

When is a door not a door? When it fails to function as a door.

The problem is that all door core materials are either not high precision, too heavy or will move when exposed to moisture, humidity or change in temperature resulting in door failure.

Heavy solid metal or steel will not warp, bend or twist, but is not high precision due to welding (sing core tolerance is + or –  .006 inch!) and is often impractical due to the overweight issues causing excess strain on both the hardware and structure, causing continued maintenance issues.  The solution is our patented lightweight yet strong Sing core technology.

Finishing a door blank:

There are two types of finish for door blanks:  paint grade and wood grain.  Paint grade includes such finishes as metal, Masonite, marine plywood, etc.  Wood grain finish includes such finish as solid wood stave and thin veneer.

Why Use Solid Wood Instead of Veneer?

solid wood composite door planks any size thickness true flatNever settle for substandard veneer doors again. Door engineers prefer to use inexpensive veneer as opposed to real solid wood facings because veneer is thought to be less likely to warp, bend or twist.  But thanks to the super-strength of patented Sing Core technology, you can use solid wood stave and wood blanks with confidence knowing that your door can be guaranteed true flat and will stay flat.

How can a solid wood-faced door stay true flat? As every woodworker knows, when using a solid wood surface, the grain will move according to moisture or temperature change causing the door to fail. When using our patented Sing Core as a substrate you can safely use solid wood because the solid torsion box/honeycomb patented material is continually keeping the wood grain straight and true.  Whereas wood stave has more wood fiber giving it more of a chance to warp than thin veneer due to the unbalance of the both side of the door moisture contents, patented Sing technology solves this problem by combining stiffing skin on both side of our patented Sing core.  This Sing panel technology eliminates the troublesome movement of the door blank — warping is no longer a concern when wood stave is combined with patented Sing core.

In addition, solid wood is easy to work with, install (no need to hot press), repair and remodel.  That’s why professionals trust Sing Core’s years of expertise in helping to design the only wood stave doors (that look just like solid wood doors) that can stay straight and true for many decades while respectfully honoring the beauty and elegance of solid wood, which far outlasts easily-damaged veneers, yet can be sanded and repaired if necessary.

Celebrate your real wood!

solid wood stave door planks lightweight honeycomb guaranteed 50 yearsOur Eco-friendly lightweight, high strength alternative is the best   solution for combating the issues associated with weight and size,   especially large doors.  Only our patented Sing torsion box/foam   composite core combined with our years of experience provides   guaranteed solutions for oversize doors.

That’s why this technology is found everywhere, from beneath the sea   (US Navy) to outer space (NASA) and everywhere in-between.

Sing panels may be finished in almost any wood species, like   mahogany, redwood, teak wood, cherry wood, walnut wood, cedar   wood, Ipe wood, sapele wood, poplar wood, ebony wood, ash wood,   oak or any other hardwood or exotic wood types available.

This same wood blank composite technology is also a common solution for high-end projects like engineered hardwood flooring, shiplap, wood furniture, wood shelves, decking, shed doors or any other application demanding high precision and exemplary performance over time.

How is wood stave/veneer added to Sing panels?

Wood stave is added directly to the metal or wood skin our patented Sing cores.  Wood veneer is added to an 1/8-inch mdf attached to the metal skin.  Call us for a free consultation on the best option for your project.

How to BuyMetal Composite Sing Core panels are true straight, light and strong.

To order Sing Large Door panels see our pricing page  and submit an order form either by email,, or print and fax it to: 360.495.4585. We’ll provide a quote within one business day. If you have questions, please contact us.

Easy Ordering

All we need to know is the length, width, thickness and what you desire on the exterior, and your custom specialty panels are made to order. Getting a quote for your specialty product, is easy, thanks to our simple online order system.

Bulk Discounts

If you’re looking for a bargain price, remember, the more you order, the less expensive your total order will be per piece. Quantity and wholesale inquiries are encouraged. Feel free to contact us for more information. Click here for Closeout specials.

Fast turnaround: In you’re in a rush, only Sing Core can be custom made within 24 hours and is proudly manufactured for you in the USA.

Fast delivery: Any thickness and almost any length, less than 5 ft wide, can be made with in 48 hours if it is rush order.

SINGCORE Large Doors are easy to order. You may choose from our stock panels or order custom sized panels. Our price is based on the length, width, thickness, and quantity. Submit a Work Order by fax or email, and we will give you a quote within one business day. If you have a tight budget, give us a call, we might have an alternative solution tailored to your needs.

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Door Blanks

Applications -> Building Components -> Doors -> Door Blanks

Yes, Sing Core does specialize in high-end, oversize, custom one-off doors that are fit for a King, adorning palaces and mansions around the world, but we make this technology available to homeowners and commercial applications by teaming up with local door and window manufacturers across the United States. Likely, we have a partner near you.

Door blanksSing Core provides patented standard Sing Core door blanks available to door manufacturers, wood workers, contractors and millworks for use in traditional construction projects. This makes the Sing Core technology available to the masses at affordable pricing, and helps to make and keep jobs in the USA, supporting more local economies, while making the world a better place.

Our local millwork partners can turn a standard-sized door blank into a one-of-a-kind work of art, that is not only beautiful, but let’s you enjoy all the benefits of Sing Core, like:

  • Lightweight
  • Eco-friendly
  • Durable
  • Stronger than steel
  • Insulated
  • Sound-deadening
  • 10 year true flat & structural guarantee
  • Less expensive to install
  • Less stress on hardware
  • Less maintenance

Metal Door BlanksOur wholesale door blanks are supplied to your discriminating door company for use in a wide variety of door applications. Depending on your ideas, limited only by your imagination, you can use this technology in nearly any style of door. Here are some examples of how your local door company might use this technology:

  • Entry doors
  • Bedroom doors
  • Metal doors
  • Pivot doors
  • Glass doors
  • Fire doors
  • Inside doors for homes
  • Dutch doors
  • French doors
  • Pre-hung doors
  • Carriage doors
  • Sliding doors
  • Bifold doors

ready-to-ship-eco-friendly-lightweight-sing-core-panelsAlthough the most popular doors in residential installations includes any wood species available, Sing Core door blanks are also available in almost any other material imaginable, including (but not limited to):

  • Concrete
  • Brick
  • Ceramic
  • Fiberglass
  • Aluminum
  • Stainless steel
  • Fire-resistant Magnesium Oxide (MgO) Board
  • Bullet-proof Kevlar
  • … and so much more

Basically, Sing Core door blanks are available in nearly any standard construction material, making the possibilities limited almost only by your imagination.

Sing Core is constantly on the look-out for better ways to serve the general populace, and aggressively seeking ways to allow others to enjoy the sustainable, eco-friendly benefits of this patented technology.

Please contact us, if you are interested in experiencing this advantage for yourself, and/or your community for a better life for all.