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Standard-sized Doors for Retail

You asked for it, and Sing Core delivers, and as always, goes the extra mile.

For years, Sing Core has been providing the most exclusive solutions for large high-end door manufacturing, made available to only the best custom door manufacturers and millworks. Since we started supporting the door industry rarely does a day go by when we aren’t dealing with many requests for standard-sized doors for retail installations.

Unfortunately, since our factory is only set up for one-off custom large doors, the cost of making a standard-sized door with Sing Core inside is just too cost prohibitive, except in the most high-end jobs with a large budget for architectural doors. That is, until now.

Introducing Retail-ready 3-0 x 7-0 Sing Doors

Financed by our success of building high precision Eco-friendly one-of-a-kind warp-free doors that can be guaranteed not to warp, bend, twist or otherwise fail for 50 years (no other door company in the world can do that without having Sing Core inside), we have created a new division at our factory to build standard-sized 3-0 x 7-0 doors with Sing Core inside.

These warp-free flush doors are priced to sell, so that you can now provide the best doors to your retail clientele featuring Sing Core inside at a price point that is attractive and affordable.

Priced for Retail Kick-off Event

We are kicking off this new line of retail-ready doors in the most requested size: 3-0 x 7-0 doors, available for either interior or exterior applications. You also get to choose from paint grade, veneer, or natural wood stave Sing flush doors starting at $xx.xx each, with no minimum order.

Standard lite cut outs are available (8 styles to choose from). Doors with window openings cut require a 10 piece per cut out design minimum order.

Strongest Lightest Weight Doors in the World

Kick My Door

As we kick off this event, inventor Peter Sing invites you to kick his door, which is so strong, “You will break your leg before you crash my core.”

Sing Core is renowned world-wide as the only way to build a lightweight door using high precision (+/- .006 in. tolerance) core material which is stronger than steel pound for pound (660 PSI) for building doors that can be guaranteed not to warp or fail.

Note: Kick doors with Sing Core inside at your own risk.

Ready to Ship Unfinished Doors to You

As always, Sing Core does not finish, provide hardware, or pre-hang doors. Prices are for unfinished door slabs only.

To sweeten the deal even more, we will ship to your company direct. Sing custom doors are only shipped to millworks and custom door manufacturers only, because finishing and creating the ultimate warp-free door depends highly on the craftsmen who create the finished product.

Since these are standard 3-0 x 7-0 sized doors, there is plenty of hardware and retail-ready framing material available over-the-counter, so these doors do not require the same attention to details as our custom-sized doors. The only thing is, we need to trust your skills in finishing the door.

5-year Warp-free Guarantee

Assuming the door is adequately sealed and finished, Sing Core guarantees every one of these doors, both interior and exterior doors, to remain warp-free for 5 years, including full structure warranty.

Now you can order with confidence and at special retail-ready pricing your choice of 3-0 x 7-0 doors with Sing Core inside.

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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.