Non warp Sing Sandwich panel for building anything non warpingProfessional Sing Sandwich Panel

The Professional Sing Sandwich panel starts as a 4 ft x 8 ft Sing “sandwiched” panel. Professional Sing Sandwich panels are guaranteed not to warp for 50 years.

If you are an architect, general contractor or home owner and expect a non-warp guarantee from the door manufacturers (especially the very large and expensive doors) you would be very hard-pressed to come to an adequate warranty arrangement with either a door manufacturer or millwork because large doors and doors made of exotic woods are prone to fail; that is, unless the door is made with Professional Sing Sandwich inside. This is how we help to make the best doors in the world that can be guaranteed not to warp for 50 years.

Professional Sing Sandwich panels do not have a solid wood edge. For embedded solid wood edging, see: Professional Sing Panel. Just like it’s name Sandwich means professional patented Sing Core is “sandwiched” between two skins. This creates the best non-warp, lightweight, high strength panel material for superior construction. Standard Sing Sandwich continues to break all records for flatness but it will move if the skin is made of porous materials (non metal or plastic). In the event one side is exposed to excessive moisture or temperature then it could cause warping if the panel is very thin. If you have high expectations for non warping (which most of the high end large doors have problems with) Professional Sing Sandwich is the only insulated sandwich panel that warps less than any known core material. All Sing customers are happy with what we deliver when using the Professional Sing Sandwich panel to build their non warping doors, which is changing the previously known idea that all the large doors in North America warp due to the change of the seasons. The secret inside the best non-warping doors is the Professional Sing Core which keeps the Professional Sing Sandwich panel flat from our factory to its destination and stay flat for 50 years with structural integrity guaranteed.

A Professional Sing Sandwich panel consists of a substrate of 1 inch patented Sing Core® torsion box reinforced insulated substrate with special patent pending Sing stiffeners sandwiched between two ¼ inch sheets of plywood, resulting in the most Eco-friendly lightweight and high-strength (660 PSI, stronger than steel pound-for-pound) non-warp material. The Professional Sing Sandwich panel is the basis of many applications spanning a multitude of industries.

Professional Sing Sandwich panels have no solid wood edge. For embedded solid wood edging, see: Professional Sing Panel.

Premium Sing Panel SealStandard Professional Sing Sandwich

The Professional Sing Sandwich panel takes the standard Sing Sandwich panel to a new level of high precision and increased performance. The Standard Professional Sing Sandwich panel comes in standard 4 ft. x 8 ft. x 1.5 in. size that can be cut, ripped or sawn into any shape, size or thickness in your wood working shop (no special tools required).

Standard skin = 1/4 inch plywood  Option = Marine-grade plywood

Available in any thickneess from half-inch to 6 inch.

Standard Professional Sing Sandwich panels are specially re-enforced for increased performance by our team of experienced professionals with an acute sense of composite technologies to create a professional panel that will have the structural integrity to far exceed performance standards deemed “acceptable” by the trade industry.

The Professional Sing Sandwich panel is available only to trade professionals, includes embedded stiffeners and is cold-press-ready or available as paint grade or with natural wood stave surfaces. For hot-press-ready see Hot-Press-Ready Sing Panel.

Case Study

Large Midwest door manufacturer regularly caters to high end clients seeking doors that are larger than normal size.

Problem: It’s just a matter of time before these large doors fail due to warp.

Solution: Door manufacturer uses Professional Sing Sandwich to use as substrate in their doors to prevent warp.

Details: Midwest large door manufacturer stocks Professional Sing Sandwich panels in convenient door blank sizes 4 x 8, 4 x 10, 4 x 12, 5 x 8, 5 x 10 and 5 x 12. These panels are cut to size and used as substrate inside their custom door frames, skinned and finished in house solving their large door problem; now they can warranty their own large doors to never warp again.

What is Standard Professional Sing Sandwich designed for?

To keep panels and beams perfectly straight, lightweight with high strength to the very extreme. Almost no other door core material (such as balsa wood, LVL core, composite lumber, solid wood core, plastic core, aluminum core, paper core, cardboard core) could match the performance. Other cores do not have all the features of Professional Sing Sandwich panel, such as being fully insulated up to R-5.7 per inch, true flat / non warp, strong and light weight yet Eco-friendly.

Which industries use Standard Professional Sing Sandwich?

The majority of Professional Sing Sandwich panels are sold to high end mill works and door manufacturers to build very large doors such as pivot doors, sliding doors, entrance doors, French doors, etc… If the door builder has a problem for keeping the door from warping, lightweight and super-strong? Professional Sing Sandwich is the answer for use as a fully insulated door plank, door substrate, door core and/or door panel.

Premium Sing Panels 50 Year Non-warp Guarantee for exterior useCustom Professional Sing Sandwich Panel

Available with all the options available in the classic Sing Sandwich, the Custom Professional edition has even more strength, integrity and ability to span distances with little or no support and little if any whatsoever.

Custom Professional Sing Sandwich panels are available in any size, any thickness i.e., large oversize panels or planks, posts and beams, with any of the following custom options.

Custom Professional Sing Sandwich Panel Upgrade Options

Available to trade professionals and industries are a myriad of custom Sing Sandwich panel upgrade options that include (but are not limited to):

  1. Closed Sing Barn Door

    Non-warping Sing Sliding Door in closed position

    Skin Options

    1. Natural wood stave
      • Red cedar
      • Port Orford cedar
      • Sapele cedar
      • White oak
      • Mahogany
      • Cherry
      • Birch
      • Maple
      • Walnut
    2. Composites
      • LVL
      • MDF
      • Fiberglass/FRP
      • Masonite
      • Kevlar®
    3. Metal
      • Aluminum
      • Cold rolled steel
      • Stainless steel
      • Hot rolled steel
      • Copper
      • Lead
    4. Open Sing Barn Door

      Non-warping Sing Sliding Door in opened position


      • Granite
      • Marble
      • Travertine
      • Limestone
      • Soapstone
      • Onyx
      • Slate
      • Concrete
      • Cement
  2. Inner frame options
    1. Natural wood frame
      • Fir
      • Poplar
      • Oak
      • Ash
      • Maple
    2. Metal
      • Extruded aluminum
      • T-slot
  3. Embedded hard points
    • Lock blocks
    • Stiles
    • Rails
    • Window frame(s)
  4. Glass window cut outs
    1. Per your design drawing/specs

And any other options that may be available per your specifications. Contact us for more information.

For Hot-press Applications, See: Hot-Press-Ready Sing Panel