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Save Thousands on Your Next Order

There is a new door making technology to build door blanks for door manufacturers and millworks for any type or design of door with almost any door skin for less guaranteed by inventor Peter Sing. Less than half the labor of stile and rail door. You can save hugely on entire door schedule and get our 50-year warp-free guarantee on all your doors.

With our patented core technology and high production capacity, we are able to produce the highest quality doors at a very low price with very quick turnaround times. 

By making the same size doors, we can cut the production time in half. We add special solid edging to the doors so you can trim them yourself.

We were able to bring a customer’s order total down from

$27,500 to $13,500

for a total of

$14,000 in savings.

We did this by changing their order of 21 different door sizes down to 4 different door sizes.  The customer easily trimmed their own doors. SingCore gave the same 50 year no-warp guarantee to this customer’s order.

Here is what their order looked like before we offered them half price on their order if we could reduce the variations of door sizes:


Quantity Application Description
1 Pocket Door 106.5″ x 45.0″ x 2.0″; 1/8″ 
2 Pocket Door 106.5″ x 23.5″ x 2.0″; 1/8″ 
7 Pocket Door 106.5″ x 31.0″ x 2.0″; 1/8″ 
1 Pocket Door 106.5″ x 38.5″ x 2.0″; 1/8″ 
1 Hinge Door 106.5″ x 31.0″ x 2.0″; 1/8″ 
1 Hinge Door 106.5″ x 30.0″ x 2.0″; 1/8″ 
1 Pocket Door 106.5″ x 30.5″ x 2.0″; 1/8″ 
1 Pocket Door 106.5″ x 20.5″ x 2.0″; 1/8″ 
1 Pocket Door 106.5″ x 30.0″ x 2.0″; 1/8″ 
1 Hinge Door 106.5″ x 33.5″ x 2.0″; 1/8″ 
1 Hinge Door 106.5″ x 34.0″ x 2.0″; 1/8″ 
1 Pocket Door 106.5″ x 37.0″ x 2.0″; 1/8″ 
1 Pocket Door 106.5″ x 31.0″ x 2.0″; 1/8″ 
1 Hinge Door 106.5″ x 31.0″ x 2.0″; 1/8″ 
1 Pocket Door 106.5″ x 33.0″ x 2.0″; 1/8″ 
1 Hinge Door 106.5″ x 34.5″ x 2.0″; 1/8″ 
1 Pocket Door 106.5″ x 46.0″ x 2.0″; 1/8″ 
1 Hinge Door 76.0″ x 24.0″ x 2.0″; 1/8″ 
1 Hinge Door 80.0″ x 36.0″ x 2.0″; 1/8″ 
1 Hinge Door 106.5″ x 28.5″ x 2.0″; 1/8″ 
1 Hinge Door 106.5″ x 19.0″ x 2.0″; 1/8″ 

Here is what the client’s order looked like after we had negotiated removing many of the variations of door sizes:

Quantity Application Description
6 Other Door 106.0″ x 40.0″ x 2.0″; 3/8″
7 Other Door 106.0″ x 36.0″ x 2.0″; 3/8″ 
16 Non-Door 106.0″ x 27.0″ x 2.0″; 3/8″ 
1 Non-Door 106.0″ x 19.0″ x 2.0″; 3/8″ 

A typical order from a customer may consist of many different variations of door sizes. The different sizes of doors take us longer to full fill an order. If instead you place an order with all the same size doors, we can streamline our manufacturing process which saves us time and money. We in turn share those savings of time and money with you.

Let us do the most labor intensive parts and you finish the rest to build the best door in the world, especially very large door, but our standard-sized door panels are very affordably priced.

SingCore Applications

Our patented core technology has been used in many applications. Click the links below to see how SingCore can help you achieve your aesthetic and business goals:










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Wholesale Pivot Doors | Warp-free 4×8 Pivot Door Blanks

Wholesale pivot doors from Sing Core. Warp-free 4×8 pivot door blanks available to pivot door manufacturers only.

Wholesale pivot doors Warp-free 4x8 pivot door blanks

Wholesale pivot doors Warp-free 4×8 pivot door blanks

Our standard 4’ x 8’ pivot door blank is our only standard pivot door blank available to pivot door manufacturers and therefore is comes at an affordable 4 x 8 ft. lightweight high strength pivot door price.

By using our warp-free 4×8 pivot door blank, you can now have an affordable way to build a 4×8 pivot door that is guaranteed to make your pivot door end users very pleased with an impressive 4 x 8 pivot door which can be used as an exterior pivot door, with the most impressive characteristics.

4×8 Pivot Door Blank Untrimmed

The standard 4×8 pivot door blank is untrimmed (glue will be visible at seams) and ready for your in house door manufacturers to skin and finish to your client’s specifications.


Pivot Door Dimensions: 4 ft. x 8 ft. x 3 inches thick

4×8 Pivot Door Blank Trimmed

The standard 4×8 pivot door blank can be trimmed (no glue visible at seams) and ready for your in house door manufacturers to skin and finish to your client’s specifications.


Pivot Door Dimensions: 47.5 in. x 95.5 in. x 3 in. thick

Blank Pivot Panel 4×8 Specifications

• 3 inch top and bottom rails
• 1.25 inch edge stiles
• Weight = 122 lbs.
• Made in Pacific Northwest of USA (locally grown and mfg)
• Top quality A veneer on both sides of the panel
• 1/2 inch AC plywood skins

Sing 4×8 Pivot Door Blank Features

Far exceeding AWI standards for flatness, remaining straight and true with less than 1/16 inch warp at 8 ft. span = true flat.

Solid core material consists of patented Sing Core, small grid natural fiber vertical grain reinforced torsion box hybrid.

Very lightweight, a fraction of other natural wood fiber core materials.

Highest strength. See Sing 4×8 pivot door blank under 1000 lbs. center load with very little deflection.

Fully insulated wall-to-wall for climate control and sound deadening qualities.

Top quality A veneer ready for adding your laminate, surface material, and/or finishing.

Even under 1,000 lb. load, very little deflection.

Warp-free Pivot Door Upgrade

Sing warp-free pivot door blanks are manufactured with additional patent-pending warp-free stiffener technology built into the door’s Sing Core material. This enables the resulting pivot door to be guaranteed not to warp for 50 years.*

Discount 4×8 Wholesale Pivot Doors Pricing

Available to pivot door manufacturers only, the standard Sing 4×8 pivot door blanks are only available in quantities of 10 or more pivot doors. Less than 10 pivot doors will not qualify for wholesale discount pricing for pivot doors.

Final pivot door prices will include crate and shipping charges, available by submitting your wholesale price quote request.

* = Pivot doors are guaranteed by Sing Core on a door-by-door basis in cooperation with the pivot door company providing the pivot door(s) to the end user. Qualifying pivot doors will be manufactured and finished to strict conditions to preserve the integrity of the door over time. Only warp-free pivot doors accompanied with the written Sing Core Warp-free guarantee are covered.

Minimum order for pivot door manufacturers = 10 standard 4×8 pivot doors for special wholesale prices.

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Surplus Tiny House Inventory

Expires August 25th, 2017

Surplus-inventory-clearance-sale-Sing-tiny-house-reinforced-structural-insulated-panels-rsipstack-of-honeycomb-panels-with-solid-wood-edgesIt is widely known that Sing Core manufactures the world’s best panels for the upscale commercial manufacturers and builders in the Tiny House movement. Even though we only conduct business wholesale trade direct, occasionally we have surplus tiny house inventory.

You can cash-in on this opportunity to obtain Sing tiny house panels for your tiny house project. For these surplus items, you do not have to be a certified manufacturer or distributor.

You will be allowed to have discount access to a quantity of Sing sandwich panels limited to type, style and size on-hand. Quantities are limited and offered on a first-come first-serve basis. Also note, as always, we do not provide retail customer support for how to build a tiny house.


Item no longer available

(Note: Currently there is no surplus inventory due to production improvements)

These are the same Reinforced Structural Insulated Panels (RSIP) that are fully insulated, lightweight high strength panels (stronger than steel) used as floors, walls and roofs in the best tiny houses.

Q: Are 1.5 inch panels strong enough for my tiny house?

A: These are not like any other honeycomb panel in the world. Normal honeycomb panels rate at 10-to-100 PSI strength, while Sing honeycomb structural panels independently test at 660+ PSI and have unprecedented shear strength. Look at these pictures:

No problem for these 1.125 inch panels to support this massive upper structure thanks to patented Sing Core. No other material compares.

These panels are only 1.125 inch with no solid wood edges (compare to 1.5 inch w/wood edge upgrade).

These panels are only 1.125 inch with no solid wood edges (compare to 1.5 inch w/wood edge upgrade).

There are so many ways to build a tiny house as no two are the same, and the methods, especially when using Sing tiny house panels, are so varied, even we are astonished at the many innovative methods that the ingenious tiny house builders. We’re especially fond of the tiny house builders that embrace our frameless approach to tiny house design.

Note: Sing Tiny House Panels are available for wholesale only to tiny house building contractors. You may purchase these patented panels if you have knowledge equivalent to that of a building contractor.

Quantities are limited. If you would like to get your hands on these surplus panels before they’re gone, call us at


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.

Note: Prices do not include shipping.

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Industry Associations

Millwork, Woodworking, Veneer & Hardwood

American Hardwood Information Center

American Plywood Association
Recently changed name to Engineered Wood Products Association

Appalachian Hardwood Manufacturers, Inc

Architectural Woodwork Institute

Composite Panel Association

California Redwood Association

Hardwood Plywood & Veneer Association

International Wood Products Association

North American Deck & Railing Association

North American Wholesale Lumber Association

National Hardwood Lumber Association

Northeastern Lumber Manufacturing Association

National Oak Flooring Manufacturing Association

Southern Cypress Manufacturing Association

Southern Pine Inspection Bureau

The Hardwood Council

West Coast Lumber Inspection Bureau

Western Red Cedar Lumber Association

Western Wood Products Association

For wood properties and spec sheets see U.S. Forest Products Lab:

For a more complete list see:


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Sing Core

singcore sheet 2Sing Core:       Gallery

Sing Core is the foundation of the newest lightweight / high-strength eco-friendly building material that is taking the world by storm. Sing Core is at the center of that storm that leaves a greener more sustainable planet in its wake.


Purchasing raw Sing Core


  • Sing Core is sold by the block
  • Each block is 12 in z 12 in x 50 in.
  • Wt. per cubic ft range from 4 lbs to 7 lbs. per cubic ft.
  • Compression strength: 2 inch x 2 inch x 3/4 inch App. 660 psi


wholesale-raw-sing-core-available-in-bulkWho can buy raw Sing Core?
Examples of those who purchase raw Sing Core include:

  • Small one-man shops
  • Largest furniture,
  • Building material mfg in the world.


lightweight-university-logoHow do I get started?


  • All buyers are required to go through Lightweight University training program following your certification as a licensed Sing products mfg.


Applications of Sing core;


Sing core is the fundamental building block of all patented Sing products and can be manufactured with basic woodworking tools.


All patened Sing products are start from this simple lightweight high strength core see Sing products


You can use Sing Core as filler core to increase the void bwtween two panels or beams to build any structure with increased density using Sing Sandwich Panels and by adding solid edge and solid wood implant to create Sing Panels and Sing  Beams.


Sing core could solve the problem of strength, lightweight and dimensional stability of panel, post and beam structure components for many industries.


Sing products are simple to make; likewise, our pricing methods are simple and unique.


singcore sheetWhich industries use Sing core?


Sing Core has greatly impacted and modified the methods by which many products are made, affecting multiple industries and product categories.


For instance, Sing Core is providing solutions for aluminum fabricators for a stronger end product with superior strength while still being extremely lightweight, eliminating excess welding and fastening to the frame, using Sing Core’s press technology.


The result is a better eco-friendly sustainable result that looks better when the job is complete, that requires less labor, increased production output with less high-skilled labor (aluminum welders and fabricators).


Sing Core technology provides you with more strength, much lighter weight in comparison to other building materials and an aluminum panel that is true flat.


The surface of any Sing Core panel can be any substance that meets your requirements greatly enhancing the broad spectrum of industries across the board.


Can I use Sing Core blocks to build curved designs?

Sing core can be cut into any flat shape. Sing Core is versitile and can be sanded or planed to any desired thickness.


Sing Core Drop-in Processsingcore drop in 1

The technology of Sing Core is a “drop in” process. This process includes, laying a bottom skin of any flat material, then creating the solid outer edges that could also be made of any material, i.e., wood, plastic, aluminum, stainless steel, cement board, etc… implant blocks may be placed at this time at desired location if necessary.

The empty container, hollow interior, is filled with patented sing core (dropped in) that is sliced to the desired thickness. The interior surfaces are glued prior to securing the top skin then cured.

Now you have a completed panel of any length, width or thickness that can be used as a wall, modular furniture panel, cutting board, nearly anything completed and ready to go.


Sing Core block could also be used in a variety of applications, and can also be manufactured into Sing Core Panels, Posts and Beams.


Sing products are simple to make; likewise, our pricing methods are simple and unique.

Singcore Drop 2

The surface of any Sing Core panel can be any substance that meets your requirements greatly enhancing the broad spectrum of industries across the board.




Remember, Sing Core technology is completely customizable to your specifications as they are available in any length, any width and any thickness and bonded to any exterior finish.


We are so certain that Sing Core is the solution to your green building challenges that we offer a 100% refund for any prototype order, for those who want to test drive any form of Sing Core products for use in their applications, so you have nothing to lose. Click Here for our convenient online order form.