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How to Build a True Flat Long Lasting Carriage Door

How to Design Order and Build your Carriage Door

True Flat Guarantee premium certified true flatTrue flat technology is based on expertise in building carriage doors that can be guaranteed true flat and stay flat. This composite science includes the proper proportions of Sing Core, aluminum and/or other materials based on your requirements or specification. In this way each Sing carriage door is a work of art.

Wood-based carriage doors are exposed to a variety of weather conditions, glaring sun, wind and rain and it is important to keep the surface primed and coated to make sure that it does not crack while exposed to weather.

Sing carriage doors prolong functionality of surface treatments due to being made with patented Sing Core’s torsion box structure that holds the wood surface to maintain a forever flat surface without twisting or cracking.

You may further weather-protect – even for withstanding the most severe weather conditions – by integrating other material into the surface of your Sing carriage door. Surface skins of aluminum, FRP or stainless steel will not crack like natural wood or plywood to prevent compromise of your Sing carriage door.

Rot-resistant-wood-panels-will-not-warp-twist-crack-or-cup-for-long-lasting-true-flatnessIf you like the look of solid wood but seek high-performance and longevity, you can use Sing aluminum as your true flat carriage door’s substrate, you will be able to maintain straightness of your doors making them less likely to crack due to movement cause by expansion and contraction of the wood surface material.

See how Sing Panel’s torsion box structure prevents surface crack because of the patented Sing Core’s unique characteristics.

To keep your carriage door true flat is a challenge for solid wood or even plywood.

Sing Core and Sing Panel master true flat technology for very high-end doors requiring less that 1/16 inch deflection which is more costly.

Sing carriage doors far exceed the AWI industry standard or ¼ inch deflection to be considered flat.

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

To order True Flat Carriage 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 True Flat Carriage 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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Sing Panel Q & A

Home -> Products -> Sing Panels -> Sing Panel Q&A

1) Are Sing Panels like other honeycomb core panels?

· Only in appearance. Other honeycomb panels do have a grid system, but generally the grids are left empty.

· Sing Panels feature vertical wood grain torsion box to form the grids. The voids are bonded and filled wall-to-wall with resilient recycled foam (a variety of foams are available to meet your specifications).

· Only Sing Panels are solid as a rock. (Warning: Do not kick a door made with a Sing Panel, you will break your leg before you break the door.)


2) What is the R-value of the Sing Panels?

· The R-Value of Sing Panels using EPS Foam is 3.5 per inch. The R-value of Sing Panels using Urethane Foam is 6.5 per inch.


3) How strong are Sing Panels?

· Very strong. In fact, they are the strongest affordable lightweight building material.

· They have been independently tested by the University of Washington to exceed 660 PSI, and can be custom designed to achieve over 1,000 PSI per your specifications.


4) Do Sing Panels have solid wood edges?

· Yes. Sing Panels feature solid wood (or other solid material) edges. If solid edges are not necessary, consider Sing Sandwich panels.

· The wood edge is visible between the exterior surfaces (or “skins”) on the edges. Edge-banding is available at extra charge.


5) What surface materials are available for Sing Panels?

· Our standard surface material is Luan (lightweight plywood).

· Sing Panels are available in basically any flat exterior building material and is limited only due to availability.


6) What thicknesses are available?

· Standard thickness of Sing Panels are 3/4 inch to 8 inches thick.

· Custom thicknesses are available to meet your required specifications, up to 12 inches and beyond.


7) How big can you make Sing Panels?

· Standard sized Sing Panels are 4 ft. x 8 ft..

· They are available in any dimensions, up to 22 ft. by 40 ft. or larger.

· Note: When ordering oversized Sing Panels be certain to confirm that the panels that you order will meet your performance specifications.


8) Are Sing Panels weather resistant?

· Sing Panels are lightweight, high strength and weather resistant only to the degree of the surface material.

· Sing Panels can be manufactured to withstand the most extreme weather conditions, and are even used in underwater applications (consult with Sing sales staff prior to ordering waterproof Sing Panels).


9) Can Sing Panels resist the heat of powder coating?

· Yes. Sing Panels can be designed and manufactured to withstand the heat of powder coating.


10) Can I bond other materials to the surface of Sing Panels?

· Yes. Many of our high-end millworks adhere other surface materials to Sing Panels when used as substrate.

· Standard Luan (lightweight plywood) surfaces are easily adhered to with regular carpenter glue and cold-pressed.

· If your intention is to laminate other materials to your Sing Panels, you should check with us first, to make sure that you are using the proper bonding agents) to achieve the results you desire..


11) Can I use Sing Panels to make furniture?

· Yes. In fact many leading edge furniture manufacturers are joining the Sing Panel revolution. See: Sing Furniture.


12) Can I hot press Sing Panel?

· Yes. We just finished up a 40 run of hot-press veneer for one job. Tip: When using a wood veneer, some warping could occur. Our expert staff encourages adding a thin later of aluminum between the core and the skin.


Sing Core mission statement: To make life easier, Sing Panels are simple to build with, simple to use and are built to last and this makes them beautiful, so Simple is Beautiful.