The top doors in America are installed in the top floor of the tallest building in the United States, located at One World Trade Center, New York. These 16 ft tall 3 ft wide 2.25-inch thick warp-free door panels are among the only Eco-friendly lightweight, high strength, insulated doors made in the USA that can be guaranteed not to warp, bend, twist, cup or otherwise fail for 50 years.

Top floor of One World Trade Center has "Sing Core inside."

Top floor of One World Trade Center has “Sing Core inside.”

If you’re one of the top contractors in America, when you’re called on to deliver the best tall doors to the top of the World Trade Center, you want to make sure you’re not embarrassed when your sleek white oak doors fail due to warping. See: How to Make the Best High-end Veneer Doors.

Tallest 16 ft. doors at the top of the tallest building in the USA

These 16 ft. tall doors feature 0.020 veneer very long and matched perfectly.


The secret to creating an incredibly smooth wood veneer door is what lays underneath the natural wood veneer. At Sing Core, the True Flat Team is likely to laminate 0.020 veneer over top of 1/8″ MDF on top of 1/4″ plywood. Of course, your door will only remain straight for 50 years, if you have Sing Core technology inside.


When your reputation depends on it, you need the backing of a professional company that can deliver the goods and have your back, and there’s only one company in the United States that builds large doors which can be guaranteed for 50 years.

The most exclusive architects in the world specify “Sing Core inside” their doors when nothing less than the very best will do, and you want your customer to be on the top of the world.

Let’s take a tour of these revolutionary doors from the factory to the top floor of World Trade Center One…

Photos taken from the edge of the panel show the perfectly straight quality. The panel shows glue on the edge, because the customer requested untrimmed ends.

Measuring at 2.25 inches thick, this is the most premium quality door money can buy.  Due to the patented and patent pending SingCore technology, this 15.5 foot long, 3 foot wide, 2.25 inch thick pivot door is straight as an arrow, better than AWI standards.

Many Ways to Build It

Depending on your budget, you have a number of different options when you opt to go with Sing Core.

  • You can order substrate only and apply your own soft wood or hard wood veneer (economy option)*
  • You can supply your own veneer for us to apply
  • You can choose solid wood edge banding
  • You can choose our highest end selection, where we provide the veneer and apply it in nearly any soft wood or hard wood, such as, Mahogany, Walnut, Maple, White Oak, Alder, Cedar, Hemlock, Fir.

How to Build the Perfect 16 ft. x 3 ft. High Precision Warp-free White Oak Door

You start with patented and patent-pending Sing Core inside sandwiched between American-made A/B plywood with solid oak around all four edges.

After pressing, trim the edges, then add another 1” x 2.25” solid oak to the edges. Sand it to perfection then hot-press 16th-inch white oak veneer, then all you can see is solid white oak. Beautiful.

The result is a perfectly flat lightweight white oak door that is stronger than steel pound-for-pound, weighing in at a mere 220 lbs.

 * Professional veneering can be very tricky. If you are getting substrate from Sing Core and having your millwork (or someone else) apply the veneer, be certain to affirm that they have the expertise to apply the veneer appropriately. We use the highest level of professional veneer professional and techniques. We can guarantee our veneering, if you have veneering done off-site, it is their responsibility to do it correctly. A faulty veneer could jeopardize your Sing warranty.

Ask us if you have any questions.

Full Service Veneering:

We offer our ultra high quality veneering service for customers who need that extra level of quality.  

The process of applying veneer isn’t simple.  One wrong move can ruin your product, which means large amounts of money fixing the problems.  It can even result in the need to buy new doors. We have solved all of these problems for you, but your choice of methods will ultimately depend on your budget.


If you decide to veneer your own doors, we offer more than one option:

Premium Option

MDF layer.  We apply an MDF layer to our legendary ply substrate.  This offers you the most stable option for applying your veneer job.  You can save money on your end by getting the job done correctly the first time.  Besides, if your do not apply your veneer to the proper surface, it could result in having to redo your veneer job.  In the worst case scenario, applying your veneer improperly can ruin the doors.  That’s why, with our premium option, we ensure you a proper surface for your application.


Our standard substrate, made from high quality plywood, offers you a great surface to apply your skins, but you must make sure to do your veneer job properly, or it could result in a ruined veneer job.  Veneering requires experts who have a very high level of skill.

Note: SingCore is not responsible for any damages which result from skins improperly applied by our customers.

Other Skin Options:

In our economy class products, we offer soft wood and hard wood plywood skins.  We also offer MDO, MDF, Formica, Masonite, and many other skins.  Click here for more information.

In our highest end price point, we offer full on wood stave skin doors, made with the highest quality hard and soft wood 1/8″ 
real hardwood stave skin.  Click here to see some of the most beautiful doors in the world.