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True Flat Sliding Doors

True flat technology is based on expertise in building a sliding door that can be guaranteed true flat and stay flat. This composite science includes the proper proportions of Sing Core, aluminum and/or other materials and bonding agents based on your requirements or specifications. In this way each Sing sliding door is a work of art.

One of the greatest attributes of your sliding door is the actual performance of the sliding door. See our new C Series line of Affordable Barn Door and Sliding Closet Doors.

Certainly, upon installation, your wood sliding door or interior pocket doors may perform superbly… but for how long?

It may be important for you to seek out how to make a sliding door that has a high level of performance. And what are the benefits that will increase the performance of your sliding door? Consider:


1. True flat straight and will stay flat
2. Lightweight 1/3 the weight (or more)
3. High strength stronger than steel lb. for lb.
4. Insulated starting at R3
5. Sound-deadening starting at SCT 30
6. Resistant to warp, twist & rot to meet your specifications
7. Longevity built to last for centuries
8. Guaranteed 10 to 50 year guarantee
9. Eco-friendly sustainable true green technology

Only one door company can deliver a sliding door that delivers high marks in all those important features. See our comparison chart comparing Sing Core doors panels to other door core materials.

True Flat Guarantee premium certified true flatSo if you’re looking for closet ideas, sliding closet doors or double closet doors for your wardrobes that are true flat and stay flat without warping or twisting, then you might consider the Sing Core alternative.

Our industrial sliding doors and marine sliding doors are specially designed to survive the rigorous changes in the elements including exposure to extreme weather conditions.

The secret lies within the core of the sliding door which is basically one of our honeycomb panels (which is also available in aluminum honeycomb panels) that is the foundation for the superior performance of sliding doors that must remain perfectly straight to reduce maintenance over time.

Even though any Sing sliding door can be finished in any flat exterior building material, the aluminum sliding door is extremely popular and can easily have any other surface material, like any wood species, concrete, glass, FRP, HPL, and can be made to be water-resistant or bullet-proof.

The Sing sliding door is not only a light door that reduces strain and wear on the door hardware, but it is also stronger than metal hanging sliding doors and even make magnificent plastic sliding doors.

And when it comes to big sliding doors, our custom oversize sliding doors continue to deliver the best results enjoyed by the top millworks and door companies in the world service the most demanding high-end users.

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

To order True Flat Sliding 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 Sliding 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.