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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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Large Oversized Doors

What can you expect from Sing Core?

The best Large Oversized Doors, oversized pivot door, oversized sliding door or any door of any type, style or size that can be guaranteed not to warp, bend, twist or otherwise fail (including full structure warranty) for 50 years. No door can achieve such high levels of precision, performance or longevity unless it has patented SingCore inside.

How Can I Get a Door with Sing Core Inside?

We are the manufacturers of SingCore. We do not sell retail. We only supply the best architects, builders, manufacturers, millworks and door companies with patented SingCore products that lift and redefine the limitations of weight and strength in building materials such as doors, panels, post and beams.

If you are interested in using patented SingCore in your next project for its Eco-friendly lightweight and high strength characteristics and you are an Architect, Millwork, Trade Professional, or Wholesale/Distributor, please feel free to Click for Pricing.

Homeowners or retail inquiries please contact your local trade professional or favorite door company and tell them you want a door with, “SingCore Inside.”

Large Oversize Doors


Sing Core specializes in custom 1-off high-end large oversized doors, sliding doors and aluminum doors. Why? Because no other door manufacturers does huge Eco-friendly doors better. The Sing Core Door manufacturing plant is set up especially to make panoramic doors that are up to 50 feet tall/wide, yet true flat, lightweight and stronger than steel.

See the Sing Best Door definition


Huge doors present a variety of complications for designers and installers. Due to structural changes in the materials and changes in the physical environment. A door that appears to be a perfect fit at the time of installation, most likely will be a huge disappointment over time. This causes extraneous maintenance fees, loss of energy, and lack of long life requiring early replacement.


True Flat – Guaranteed

3-sliding-exterior-doorsSing Core is the only door manufacturer that can create eco-friendly doors that can be guaranteed true flat regardless of the size, and will not warp, twist or experience extreme deflection under stress. And, thanks to the lightweight properties in comparison to other solid materials available, Sing Core oversized doors though large in size, are lightweight, causing less strain on the structure and hardware. Sing Core doors are available in any height, any width, any thickness.


Energy saving doors are becoming more important especially when considering doors of large size. Sing Core large oversize doors are extremely energy efficient due to built-in insulation that adds both energy saving and sound deadening properties.

Sing Core large doors are not only Eco-friendly, lightweight and stronger than steel, they are extremely affordable when compared to other lightweight but strong materials.

This 25 Foot long 10 foot tall door was installed into a Seattle Tech Giant.

25 Foot long 10 foot tall sliding door for a Seattle Tech Giant.

The best-known, oldest, most reliable, high-end millworks in the United States depend on Sing Core to deliver the goods for them when it comes to large, oversize doors. Why? Because Sing Core large doors are the only oversized doors that can outperform any other door in terms of long-lasting satisfaction and guaranteed true flat. Just let us know your expectations and based on our expertise, we will be able to provide you with a solution that we can guarantee.

Challenges of door manufacturing are based on three factors:

1. The skin (surface material)
2. The thickness
3. Door size

Based on years of experience, we know how to manipulate those numbers to your best advantage to make certain that you get the results you desire. If you’re considering an immense large interior or exterior door, you should consider a Sing Core large oversize door that comes with a full 10-year structural warranty.

Large extreme edge pivot swing doors with man door Center for Architecture Design Seattle singcoreSome of our design solutions include very large doors, like large French doors, large church doors, large carriage doors, large closet doors, large cabinet doors and large front doors and in most cases to guarantee true flatness aluminum plays a part in the composite design.

Sing Core oversized entry doors, oversized French doors, oversized front door, oversized interior doors, large glass doors, large patio doors and large entry doors by far exceed the requirements of any other doors available on the market today.

When it comes to large exterior doors, large pocket door, large interior doors, large glass sliding doors, large garage doors or large wooden doors no other door manufacturers can deliver superior results, like Sing Core.

Whether you’re considering a large sliding glass door, large wood doors, large sliding doors exterior, large shop doors, large opening doors or large pivot doors, Sing Core is your one-stop solution for your oversize door, guaranteed.

Lightweight insulated door core 15' length

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

To order Sing Large Doors 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.