Non warp sliding doors in Manhattan New York best lightweight high strength doorsLarge sliding doors are a challenge for any door manufacturer, especially if they are more than 7 ft. tall because they will warp, compromising the performance of the sliding doors and causing strain on hardware and structure due to heavy weight. That’s where Sing Core comes in. See our new C Series line of Affordable Barn Door and Sliding Closet Doors.

The only 50 year warp-free guarantee and full structure warranty

Our non-warp experts – and the clients that we serve – know that Professional Sing Panels are the only materials that can create a lightweight, insulated, high precision large door that can be guaranteed for 50 years for warp and structure.

Sing Core is growing in popularity across all industries as the large door solution, especially if doors are prone to warp (which most big doors are) but we also help architects, door manufacturers and high-end millworks create the best Doors of Any Size, type or style and is increasingly being sought out for endless products.

How to Build a Large Non-warp Sliding Door

The first step is to contact us with the specs for the doors that you want. The specific size(s), the exterior surface material desired and the functionality of the door, including exposure to weather conditions.

Next up, your specifications are reviewed and conferred with the trade professional via FREE Consultation.

After your free consultation, the True Flat Team will help design to design the metrics matrix of your door’s composition to result in a door that can meet or exceed your expectations and be guaranteed not to warp, bend, twist or otherwise fail (including full structural integrity) for 50 years.

How to build a large non warp sliding door premium sing panels

At the factory, door substrate specialists bond all the materials (patented Sing Core, interior hard point blocking, Professional Sing Panels, surface materials and edging) to the design specifications.

High strength lightweight non warp large sliding doors deflection resistant stonger than steel

Professional Sing Panels are extremely strong and resistant to deflection, like these non-warping door blanks that are lightweight and stronger than steel pound-for-pound.

Then skins are applied and following curing, the door blanks are shipped to door finishers who complete the door manufacturing process.

Now, your door is ready to go to the job site for installation.

Large non warp exterior sliding doors guaranteed for 50 years lightweight high strength

The final result is an Eco-friendly lightweight, insulated, high precision large door that will not fail for 50 years, guaranteed.

These large lightweight panels with extraordinary strength can also be true flat and used for sliding doors, barn doors, carriage doors, moveable walls; if laid flat, can become table top, stage floor or mezzanine floor.

Check out the new doors for one of the world’s largest distributors of mint oil! We were really happy to build two sets of large oversize doors for an essential oil warehouse recently. One pair of panels became the double door set opens to the sides (left), while the other set of three rolls off to the same side (right).

Large sliding doors non warp industrial exterior sliding doors lightweight high strength

It was important for the customer that the doors fit their doorway shape and be easy to roll. These sliding doors have a patented torsion box foam core that will keep them lightweight and smooth rolling. The series of three rolling doors link together and slide so easily that one person can push it open with just one finger.

One finger large sliding door operation non warping exterior door lightweight high strength

The customer was satisfied not to need special slider tracks for our panels. Even though the doors are enormous, they don’t have the weight problems of solid core doors.

Lightweight high strength sliding doors never warp lightweight hanging door hardware


When Peter hand delivered the panels, everyone was smiling because they knew they had made the right decision in purchasing non-warping Professional Sing Panels.

Made of Any Material

Yes, thanks to Sing Core, you can have your large doors of any size made out of any flat building material, such as any available natural wood, aluminum, brass, cold rolled steel, concrete, copper, fiberglass, FRP, galvanized steel, hot rolled steel, HPL, Kevlar, LVL, metal, stainless steel, and the list goes on and on… Like these hot rolled steel doors, easily operated by hand…

Hot Rolled Steel Large Sliding Doors