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The Best Large Doors in the World

 

 

Built to last centuries, guaranteed for 50 years

 

 

 

 

Sing Core helps the best door companies, architects, and millworks build the best doors.  Doors with Sing Core inside are built to last centuries, and they are guaranteed for 50 years.

We are proud to provide one of the longest lists of happy customers in the world.  All of those customers now possess the most prestigious large size doors, which are guaranteed not to warp, bend, twist, or otherwise fail for 50 years.

14' Tall Oak Doors in One World Trade Center

Reaching for the stars from the tallest doorway heights of the tallest building in the USA

The most successful, biggest, best, and most well-known door companies and millworks in America rely on Sing Core to provide them with the lightweight warp-free door cores that can support extreme over-sized doors, accommodate added materials (for sound proofing or fire rating), and offer strength ratings which are, pound for pound, stronger than steel.

Sing Core could not make such claims, unless we backed up our words with the highest performance results in the industry.

 

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You can rest assured that your door with Sing Core inside will forever be the best investment you will make, with many years of sustained performance and sustainability.

Eco-friendly Sing Core is fully insulated for sound deadening and climate control.

 

 

 

 

 

 

 

The best doors in the world have Sing Core inside

 

 

 

 

 

 

When you’re looking at an extravagant large pivot door, sliding door, pocket door, or an elegant French door that towers over your head, remember that we don’t build doors.

 

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We get calls everyday from homeowners wanting to add Sing Doors to their own homes, magnificent over-sized, large doors like the ones they see on our Website or in the most luxurious, over the top, locations all over the world, where Sing Core doors have been finished and installed. We do not do this, because we do not finish or install the doors. Only the best door companies in the world do this. You need to contact your favorite door company.

What we do is to supply the best millworks and door manufacturers, and the most prestigious architects in the United States with our handcrafted warp-free custom door blanks, ready to finish and install.  Their expert finishing touches are a major part of why doors with Sing Core Inside look so beautiful.  Without their expertise, Sing Core looks just like plain wood panel.

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Homeowners who would like Sing Core doors in their own homes can contact an architect or millwork to order, finish, and install the doors for them.

 

 

 

 

 

 

What Makes Sing Core Doors Different?

 

 

 

 

 

We have the best patented and patent-pending methods to create the largest, most lightweight, most insulated Eco-friendly most doors that can be guaranteed not to warp, bend, twist, or otherwise fail for 50 years.  Sing Core uses the only door manufacturing methods which can deliver these extreme results in the largest, most high precision modern doors featuring any contemporary material, because conventional large wood grain doors are prone to warping and a host of other problems, including excess weight.

 

 

 

 

 

 

How Do You Build a Sing Door?

 

 

 

 

 

 

If you’re a custom door manufacturer, you start with a Sing Core door blank and build your large pivot door, large sliding door, large pocket door, or huge French door just like you would any other door that you build. Having Sing Core warp-free door substrate inside your door makes all the difference in the world.

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Our modular door system is by far the best in the world!

 

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Before finishing

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We aren’t able to show the final door because of copyright information.

 

One of a Kind Sing Doors

 

 

 

 

 

Keep in mind that no two doors with Sing Core inside are exactly the same (except in the case of large bulk door orders).

Every door with Sing Core inside features a uniquely engineered base door material which is manufactured to exacting standards taking into account all the details of the application associated with each door.

 

 

 

 

 

Attention to Detail

 

 

 

 

 

Attention to detail is the method of ensuring that each Sing Door can be guaranteed for flawless performance and longevity by taking into account where the door will reside when it is installed. What will the climate conditions be? Will it be installed inside, outdoors, or will it be a front door with one side exposed to the elements and the other to the structure’s interior?

 

Will your large exterior door be facing North, South, East, or West? What materials will be used on the exterior of the door? Will the surface material need to match other doors featured in the project?

Large over-sized wooden doors present their own set of challenges because every different species of wood grain has its own propensity to shift with changes environmental changes, like temperature and humidity.  Sing Core inside as well as the stiffening and anti-warp configuration in the door substrate will have to be uniquely matched to any difference in door size.

 

 

 

 

 

 

Sing Core is not a one size fits all solution

 

 

 

 

 

 

That’s why you find Sing Doors featured inside the most expensive homes, commercial, and industrial locations in the United States and around the world.

 

It’s no easy job to make a warp-free large door, especially if it is door of enormous proportion which needs to remain dimensionally stable and warp-free over time, but as the most prestigious millworks and custom door manufacturers already know, Sing Core is the only way these results can be achieved.

 

 

 

 

 

 

Sing Core Solved the Problem

 

 

 

 

 

 

Sing Core has solved all of the problems associated with manufacturing large over-sized doors of all kinds.  Door designers and engineers no longer have to deal with the problems of weight to strength ratios, or having to worry about how to transport, handle, or install large heavy doors.

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Doors with Sing Core inside are not only lighter in weight than other solid core doors but they are high precision (hosting .006 inch tolerances) and stronger than steel (660 PSI or more) pound for pound.

 

 

 

 

 

 

How Can You Get a Sing Door?

 

 

 

 

 

 

All you have to do is to go to your favorite custom door manufacturer or local millwork and tell them what kind of door you want being sure to tell them you want,

 

 

 

 

 

 

 

“Sing Core inside your door.”

 

 

 

 

 

 

 

We will work with them hand-in-hand to design the perfect door to your specifications.

 

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With Sing Core
You Can Have Your
Dream Door

 

 

 

 

 

Make your door dreams come true with Sing Core inside your door.

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Wholesale Large Door Alternatives for the Best Door Manufacturers

The best door distributers represent the best in trusted door manufacturers across America for high confidence and superior door manufacturing ethics which translate to high quality and performance standards for upholding your credibility and professional ability to deliver only the best doors for your clientele.

What About Large Doors?

If you are like other distributors of the top selling doors from companies like VT Industries, you are getting some of the most coveted door jobs in your area of expertise. That is, for everything within the standard door size-range. Large doors are another thing altogether.

Large Doors

Large doors in your door schedule are going to be a problem. First off, your regular door supplier does not carry them, doesn’t want to build them, and doesn’t want you to sell them.

Why?

Because large doors fail. Even in the best of circumstances, with all the talent and expertise in making and installing millions of standard-sized doors, your supplier is unable to provide you with a door that will not fail after installation if its dimensions exceed 4×8.

Any door over 4×8 is going to present your valued client with problems. This is why large oversized doors are excluded from your standard warranty which covers the rest of the door schedule, because everyone knows that a large door will warp if it is over 4×8.

Where Does Your Door Supplier Go for Large Doors?

Every once and a while your door manufacturer takes on a large door job, which may include hundreds of standard-sized doors and a few large pivot doors, large sliding doors, or large hinge doors. What then? They don’t want to lose the job due to only a few large doors.  

So, what do they do?

The biggest and best door manufacturers in the world know there is only one trusted door manufacturer in the world that can make a large door that will not warp, bend, twist, cup, or otherwise fail, and that is Sing Core.

Sing Core Warp-free Large Oversized Doors

Enter Sing Core, the only large architectural door manufacturer in the United States who can build a large oversized door of any type or style that can build a large door of any material specified by your architect that can be lightweight, high strength, fully insulated, and can be guaranteed warp-free, not to fail, including a full structure warranty for fifty years.

Made in the USA

Sing Core doors are sustainable Eco-friendly doors which are proudly made by hand using safe domestic materials via our patented manufacturing methods using less energy, with very little waste, and a highly honorable respect for managing the best of nature’s materials and recycled materials for long almost service-free long life now and for generations to come.

Sing Core Door Characteristics

Besides being lightweight, warp-free, and stronger than steel pound for pound, Sing Core Eco-friendly doors bring many other high-end attributes to the end product which will be enjoyed by your clientele for years to come, adding even more value to your Sing Core door.

Some of the advantages of having a Sing Core door include being fully insulated for climate control and sound deadening qualities thanks to the high-precision (+/- .006 in. tolerance) patented and patent pending composite reinforced door core.

We Don’t Make Doors

Even though the best doors in the world are made with Sing Core inside, we don’t actually make doors at all. What we build is the best non-warping insulated door blanks in the world. We work hand-in-hand with the best door manufacturers in the world to provide your clients with the best doors in the world of any size, even huge mammoth-sized doors.

In this arrangement, as we help support the best door builders, we provide them with the non-warping substrate (what we do best) as we trust them with handling the door finishing, hardware, and installation (what they do best).

What We Can Do

We do provide your biggest and best door manufacturers with the best support system and can provide them with door blanks in various stages of readiness for them to complete in their door factories.

We are often called upon to make bulk runs of standard door blanks quickly, provide door builders with ready-to-finish door blanks prepared by attaching any available flat building materials, such as any species of natural wood grain veneer, natural wood planks, aluminum, cold rolled steel, concrete, fiberglass, FRP, galvanized steel, hot rolled steel, HPL, LVL, MDF, MDO, plywood, stainless steel, just to name a few, ready for your favorite door manufacturer or millwork to finish.

What We Can Do for You

If you have a good local custom door manufacturer or millwork that you work with locally you can order your Sing Core door blanks and have them sent directly to your favorite millwork or custom door maker for finishing, installation of hardware, and installation.

How to Get a Sing Door

You can get your Sing Door blank custom built to your architectural specifications by clicking on the orange Pricing button at the top of the page.

Thank you for supporting Sing Core

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Skin Types Plywood Paintgrade And Other

Plywood door skin is one of our main specialties.

Aside from our higher end soft or hard wood veneer and 1/8″ inch solid wood stave doors, we also offer a full range of soft wood and hard wood ply wood skins for stain or paint.  In our most economical range of products, we offer our paint grade, MDF, MDO, Masonite, and Formica alternatives for more restrictive projects.

 

Soft Wood Plywood – Paint Grade Option

Ply wood is at the core of your most economical, yet stable substrates.  Ply offers you the strength and stability you need to achieve the style and function you need from the most rigorously used doors you can imagine.  

 Standard Plywood Skin

 

AB Plywood Skin

AB-Plywood-Trimmed-Skin

 

Beautiful Marine Plywood Skin

 

Hard Wood Plywood

Enjoy real hardwood grain when you’re on a tight budget.

Hard Wood skins create a pleasant environment that never goes out of fashion and offers so many style choices, so you can achieve the precise look to convey your brand and image.  Whether it’s the upper echelon of the high end residential market or the most reputable segment of the commercial industry, the hard wood look might be your absolute best choice for your current applications.

Walnut Plywood Skin

Walnut Plywood Skin

 

Stunning White Oak Skin

 

Beautiful Mahogany Hard Wood Skin

Plywood Panel Mahogany Hard Wood Beautiful Skin

 

Incredible Maple Hard Wood Skin

 

Hemlock Wood Skin

 

Alder Wood Skin

 

Magnificent Mahogany Hard Wood Skin

Magnificent White Oak Hard Wood Skin

 

MDO and MDF

Many customers choose MDO or MDF because it has good warp-free capability and good resistance to water.  MDF is popular for indoor use, because it is very smooth for priming and painting applying your own veneers.

Medium Density Overlay (MDO)

MDO Plywood Skin

Medium Density Fiberboard (MDF)

MDO Plywood Skin

 

HPL, Formica, Masonite Option

We offer a wide variety of Formica, Masonite, or other types of HPL (High Pressure Laminate) textures and finishes.  We can apply any kind of HPL skin, and many come in natural wood grain designs which are indistinguishable from the real thing but almost indestructible.  This is why you find HPL is high traffic industrial and medical environments, resistant to damage and easy to clean. Just give us the product number and manufacturer.  We can apply it!

Dark Stone Finish Formica

Dark Stone Formica Finish

 

Rich Red Wood Finish Formica

Rich Red Wood Pattern Formica

 

Blond Wood Finish Formica

Wood-Pattern-Formica-Skin

 

Beautiful Dark Granite Formica Finish

Stone-Finish-Formica-HPL-Sk

 

 FRP Fiberglass

FRP Fiberglass is another very popular option.  This beautiful, durable skin option is found in some of the highest end applications, because it exudes quality and wealth.

 

Other Skin Options:

We can apply any skin.  If there is a skin you need that you don’t see on our website, please ask.  We can apply any skin.  Your panels are only limited by your imagination.

 

In our mid level category, we offer beautiful, real hardwood veneer with solid hardwood edges.  Solid hard wood edges are an additional option.

 

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.

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WOOD VENEER DOORS

Premium Veneer Doors with a 50-Year Warp-Free Guarantee

Sing Core veneer doors give you the authentic beauty of real hot press wood veneer doors with unmatched performance. Whether you need a grand entry door, pivot door, or architectural interior feature, our lightweight, high-strength panels deliver stability that ordinary veneer doors can’t match. Every Sing Core veneer door is backed by our 50-year structural and warp-free guarantee.

Why Choose Sing Core Veneer Doors?

  • Warp-Free for Life – Our patented core prevents twisting, bowing, or cupping, even in oversized formats.

  • Lightweight Strength – Stronger than steel pound for pound, but a fraction of the weight of solid wood.

  • Authentic Beauty – Compatible with nearly any veneer species, including walnut, oak, mahogany, maple, cherry, and exotic woods.

  • Flexible Options – Order ready-to-veneer substrates or finished veneer panels through our hot-press partners.

  • Trusted Nationwide – Specified for major architectural projects, including One World Trade Center.

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

 

WOOD VENEER DOOR

How Sing Core Veneer Doors Are Built

  1. Engineered Core
    Our torsion-box honeycomb structure creates a perfectly flat, dimensionally stable foundation.

  2. Solid Wood Edges
    Doors can be finished with matching edges, rails, or stiles for seamless joinery.

  3. Veneer Application

    • Local Veneering (recommended): We ship substrates; your local hot-press professional applies veneer.

    • Factory Veneering: We can arrange hot-press veneer application through trusted partners.

  4. Finishing
    Panels can be sanded, stained, painted, or clear-coated. Proper finishing ensures lasting beauty and stability.

 

 

Wood Veneer Doors

 

 

 

 

 

 

WOOD VENEER DOORS

WOOD VENEER DOORS by SING CORE

 

Frequently Asked Questions

What is a veneer door?
A veneer door uses thin slices of real wood bonded to a stable core, creating the look of solid wood with reduced cost and weight.

Why use Sing Core inside veneer doors?
Traditional veneer doors are prone to warping. Our patented substrate ensures long-term flatness and stability, even at extreme sizes.

Do you apply the veneer?
In most cases, we supply warp-free door blanks, and veneer is applied by local hot-press professionals. We can also arrange veneering on request.

Which veneer species are available?
Nearly any — from domestic options like oak, walnut, maple, and cherry, to exotic imports.

Are Sing Core veneer doors guaranteed?
Yes. All professional veneer doors made with Sing Core include a 50-year warp-free guarantee.

 

Other Skin Options:

Finally, 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 conclusion, we offer full on wood stave skin doors, made with the highest quality hard and soft wood 1/8″ real hardwood stave skin. 

 

See more of Sing Core’s Custom Oversized Doors HERE

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One World Trade Center Doors

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.”

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.

14' Tall Oak Doors in One World Trade Center

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.

2.25” thickness. 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.

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.

Ask us if you have any questions.

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Sing Stile and Rail Doors

The Sing-style approach to stile and rail doors is a horse of a different color amidst the age-old door industry. Sing stile and rail doors are lighter in weight and stronger than steel yet made of nearly any flat building material available, not matter how they’re built.

Sing Stile and Rail Look

Our most sought-after stile and rail manufacturing method produces a stile-and-rail-looking door from a solid composite Sing door slab which feature alternating wood grain orientations on the door surface to emulate the look and feel of a stile and rail door without any weak spots.

The resulting Sing Stile and rail door made of a solid door panel is the strongest, lightweight, most insulated, Eco-friendly door proudly made in the USA.

Sing Stile and Rail Construction

Even among the most tried and true stile and rail door manufacturers, they know that the only way to build a large stile and rail door which can be guaranteed not to warp for 50 years, is with Sing Core inside.

Rather than build a stile and rail looking surface and applying it to a solid slab of Sing Core, traditional stile and rail manufacturers prefer to use stile and rail components with Sing Core inside.

Basically, this means that all the stile and rail components are manufactured by Sing Core in building material formats which are very similar to our post and beam configurations, and/or furniture panels. These are assembled by your favorite stile and rail door builder just as they would any traditional wood stile and rail door components.

Sing Stile and Rail Advancements

You might be surprised what benefits can be enjoyed by custom door makers who construct their doors using patented Sing products. This new, revolutionary door building material is

Lightweight Stile and Rail Doors

Weighing in at a fraction of other solid core doors, Sing stile and rail doors can be very lightweight, even if they are very big doors, without threatening the longevity of the door’s performance over time.

High Strength Stile and Rail Doors

Stile and rail doors made of Sing Core are incredibly strong. Rated at 660 PSI, Sing Core is stronger than steel pound for pound, thanks to Peter Sing’s patented solid composite torsion box core substrate, incredible unsupported spans are possible, enabling doors with Sing Core inside to outperform any other lightweight door.

50 Year Stile and Rail Guarantee

Professional grade Sing Core has such a high precision tolerance (+/- .006 in.) and withstands just about any variance in conditions across the board, that these are the only door which can be guaranteed not to warp, bend, twist, or otherwise fail for 50 years, including full structure warranty.

Eco-friendly Sing Core

Using Sing Core is the Eco-friendliest way to build a sustainable door, which is made with a smart combination of minimal natural and recycled material combined to create this revolutionary door core material which is the lightest weight and highest strength way to build doors of any kind.

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New Revolutionary Door Technology by Sing Core

We offer our services to support door manufacturers in building stronger, lightweight, high precision and warp-free (AWI warp standard) insulated doors using our patented and patent pending Sing Door Blanks and Sing Stile and Rail frames.

Sing Core’s specialty is assisting to create incredibly large and extremely wide door panels which door manufacturers can utilize to build the most challenging high-end doors.

Large Quantity Production Runs

We can also assist in the high-quantity production runs for doors using our facility to pre-build base doors which might otherwise create a bottleneck for common door manufacturers. We love taking over the assembly line bulk of your large door orders with rapid turnaround times.

You choose your method of building your Sing Core door blanks:

1. Sing Door Core Panel

You specify the length, the width, and thickness of your Sing door blank, built to your specifications. You determine the insulation value and skin material, and we do the rest. The Sing door core panel method is the strongest and best Eco-friendly insulated door solution for any sized door, even large oversized wooden doors, available in almost any style.

Click Thumbnail to View Photos

2. Stile and Rail Door Frame

For our customers and their clients who prefer the standard design of stile and rail doors, we provide the manufacture of a stile and rail formatted frame made of any combination of Sing panel, post and beam configurations to create the most sustainable stile and rail doors, which are finished by only the best millworks and custom door manufacturers. Sing Core provides the most significant improvement to stile and rail technology (besides automation) in the last 100 years to create the strongest, lightweight, most high-precision, and warp-free performance in the history of the door industry.

Doors of Almost Any Style Could be Made with Sing Core Inside

1. Pivot Doors

Pivot doors are the highest and best use of Sing Core because for the most part, pivot doors are quite large in size and are often much thicker than a standard door. If your intention is to feature a real wood finish, you know you’re going to be in trouble, that’s when the warp-free attributes of patented Sing Core shines through as the only way to build a large wood door which can be guaranteed to offer warp-free performance over time: 50 years, guaranteed, on professional grade doors.

2. Sliding Doors / Pocket Doors

Sliding Doors often present problems when they are very large due to their sensitivity and tendency to move, bend, or cup in response to changes in the environment, for which Sing Core is the perfect solution.

Large bypass sliding doors are likely to deface, scar, or otherwise damage themselves if they are not kept straight and true by being built with Sing Core inside in advance of bypass door failure.

Pocket doors, which are the most problematic of all sliding doors, because they hide within a cavity are highly benefited from being built with Sing Core inside. If warped, the finish of the door may be compromised as it brushes against the frame or cavity’s interior, and if it cups or bends too far, may become lodged either inside or outside of the pocket unable to open and close as a door. Sing Core keeps them straight and true.

3. Hinged Doors

Hinged doors are for the most part manageable even when facing a certain degree of warp, which is normal in normal sized doors. Problems arise when doors are very large, especially if over 7 ft. tall or 3.5 ft. wide. Any movement or change in the door’s being compromised is increased exponentially in relation to the dimensions of the door. Not a problem with Sing Core’s professional door blanks.

Diverse types of hinged doors, such as French doors, sliding folding doors, front entry doors, and carriage doors (among other types of hinged doors), all present varying challenges when migrating from the drawing board to the real world, and Sing Core makes the difference.

Door Sizes

While Eco-friendly insulated Sing door blanks could be used in doors of any size, the efficacy is maximized in door performance in any door over 7 ft. tall and 3.5 ft. wide. This is why you find Sing Core inside the largest doors in high-end homes, businesses, and industrial sites, because it’s the only way to build a large door which can remain straight and true, regardless of the size of the door, while still remaining lightweight.

Door Shapes

Since every door slab manufactured by Sing Core is likened unto a one-of-a-kind piece of art, architects and designers are free to create a door of any size and shape using any available flat building material.

Sing door slabs can be created to accommodate any shaped design in any thickness, and so it goes for any shaped light cutout for glass openings.

Skin Options

Sing door slabs are available in almost any skin you want, limited only by flatness (surface material must be flat), ability to be laminated, and availability.

Some examples include, paint grade plywood, aluminum, brass, cement board, cold rolled steel, concrete, diamond plate steel, fiberglass, FRP, galvanized steel, glass, hot rolled steel, LVL, Masonite, stainless steel, any wood species including exotic species, and many more.

Our most common specialty includes the cold pressing of solid wood stave to our patented and patent pending core material, resulting in natural wood doors that can be guaranteed to remain warp-free for 50 years. Unheard of in the wood working industries. We also supply high end millworks with hot-press-ready warp-free substrates to apply their skins to.

Light Openings

Available in any size and any shape, based on your drawing(s).

STC-rated Sound Doors

We assist in the creation of sound reducing or sound proof doors which can be STC-rated at our local world-renowned pro sound testing lab. Some typical composite configurations include combinations of steel, sheetrock, MDF, and other materials to achieve the sound proof results to meet your specifications.

Fire Proof Doors

We build fire proof doors to your specs and can have them rated at the fire-rating facilities selected by our fire proof door clients.

And that’s just scratching the surface…

Imagine all the possibilities… Click Here for More

Don’t Get Stuck with a Fake Sing Door

Does Your Door Have Sing Core Inside?

If your door has Sing Core inside it can come with a full 50-year warp-free guarantee. No other door can be guaranteed like that, unless it has Sing Core inside.

It is rare, but there have been occasions when a door has warped, when someone thought it had Sing Core inside, but it did not.

For instance, last year, an architect in Florida specified a large wooden door with Sing Core inside. The contractor contacted Sing Core and received an initial price quote.

Nine months later, we received a call from the architect who had been contacted by the building department that reported that a large wooden door with Sing Core inside had warped.

We searched our records and could not find any record of the job. We did discover the initial price quote request from the contractor who must have found a different way to make the large door.

Your large door with Sing Core inside comes with a certificate of authenticity and guarantee.

Be forewarned, if your large wooden door doesn’t have Sing Core inside, you can expect it to warp.

Make sure your large doors have Sing Core inside.

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How to Join Sing Doors

Gorilla polyurethane glue is an effective glue for joining Sing panels. We recommend consulting the glue manufacturer website for instructions on use of the adhesive. For Gorilla Glue, look here.

Failure to follow the joining instructions or the manufacturer adhesive instructions could void the
warranty on your panels.

Before you begin

Attention: Please read all instructions before starting to assemble your panel
Follow the acclimatization instructions before joining panels

1. Lay Your Door Panels Flat

It is crucial that all of your panels are resting on a flat surface and are completely level. If you attempt
to glue the panels together against a wall, or any way other than flat, you will end up with a crooked
joint and “warped” door.

The first step to join a Sing Core sectional door is to lay the panels on a flat surface.

For very large door panel assembly please place straight guide beams on top of sawhorses so the
bottom of the panel can be accessible.

Assemble on a Flat Work Surface

To ensure best results, it is critical that you assemble your panels on a flat surface. If you do not
have a work surface large enough, the best way is to build your own.

The best way to level your work surface is to lay guide beams end to end, then use shims to level
each beam. It is important to lay your beams perpendicular to the joints on your panel.

Uneven Floor Surface

For wider panels you will need more rows of beams to distribute the weight more evenly and to ensure flatness of the joined panel. Make sure to level each additional row of beams with your initial row that you have already leveled. Once your work surface is level, you are ready to join your panels.

 

2. Glue and insert Your Biscuits or Spline into the Edge of One Panel

Each biscuit and slot are precisely cut to join with the greatest strength. After applying the glue to the slot and biscuit, do not use an excessive amount of glue. If the air is very dry a light misting of water can help the bond and cure time of the glue. Carefully push or hammer each biscuit lightly in place into the edge of one panel. Tap in with a rubber mallet.

 

3. Joining the Panels

The final step in joining your panels is to press the sides together. This can be accomplished a variety of ways, including gentle application of a sledgehammer, a few ratchet straps, clamps, or any other means you have of providing joining force.

 

4. How to Clamp at the Join

When you want perfect alignment for very high tolerance applications, it’s best to sandwich each joint with a straight guide temporarily during the gluing process. Polyurethane Glue expands during the cure process. You will be ensuring the glue does not expand and bow the joints.

You will need:

Flat boards to clamp or screw to (depending upon the size of your panels); Clamps or screws to create pressure on the joint while the glue cures; and a flat surface. If your panels are so large that you need to use rows of screws to clamp the joints you will need to putty the holes before finishing.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

—Old Instructions—

 

When your beautiful new Sing Core door sections arrive, it is important to take the time to glue the door together properly using polyurethane adhesive. Although Sing Core panels are guaranteed warp-free, we cannot guarantee work done on site. Failure to properly follow these directions may result in a poor final product.

Sing Splines Don’t Crack

Sing Core uses our patented core material as a spine to join several panels on site. Unlike solid wood, the stability of the core material means that there is no danger of cracking or splitting of the seam at the join location.  When Sing Core fabricates your door as a single panel it is almost seamless.  When a door is splined, it is not as high precision as a single panel due to the tolerance of glue, which is roughly 0.01-0.02 inches.

Join on Site in Three Steps

1. Lay Your Door Panels Flat

It is crucial that all of your panels are resting on a flat surface and are completely level.  If you attempt to glue the panels together against a wall, or any way other than flat, you will end up with a crooked joint and a “warped” door.

The first step to join a Sing Core sectional door is to lay the panels on a flat surface. Any flat clean surface will work. For very large doors we like to use two straight beams laid on the ground along to hold the top and bottom of each door segment.

2. Insert Your Biscuits or Spline into the Edge of One Panel

Each biscuit and slot are precisely cut to join with the greatest strength. Carefully, push or hammer each biscuit lightly in place into the edge of one panel. Then your panels are ready for joining.

3. Joining the Panels

The final step in joining a modern sliding or pivot door is to press the sides together. This can be accomplished a variety of ways, including gentle application of a sledgehammer, a few ratchet straps, clamps, or any other means you have of providing joining force. Once joined, the door is strong and secure, built to last, and can be finished and installed as any other Sing Core door.

 

 

Joining Large Sliding Pocket and Pivot Doors

Joining Large Sliding Pocket and Pivot Doors-Animated

Joining in Action

How to Clamp at the Join

When you want perfect alignment for very high tolerance applications, it’s best to sandwich each joint with a straight guide temporarily during the gluing process.

In order to make your process easier, Sing Core offers construct custom true straight guides for your application and ship them with your order. These guides are made with the same high precision core material as our other products and offer superior ease and performance.

Specify you would like clamping guides when you place your order and we will gladly include them for you.

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Cracks in Wood Stave Doors

Here, at Sing Core, we get calls all the time about problems associated with wood stave doors, especially if they are large, oversized wood stave doors. These problems, such as bending, twisting, cupping, and warping should be celebrated as wood’s natural tendency to adapt to it’s environment. Unlike other synthetic materials, wood stave is sourced from a previously live authentic tree unique unto itself, a valuable resource in the eco structure of our planet.

A tree is a living, breathing part of our environment, made of the same atomic stuff we are, a sort of shirt-tailed cousin, which survives consciously for years by continuously adapting to its environment.

Even following the harvesting of a tree’s wood, the wood’s independent slices fight for their right to continue to acclimate and survive, expressing their individuality and uniqueness.

That’s why designers, architects, and pretty much the rest of us love the look and feel of real wood. We appreciate the look of it, the design of the individual expression of the tree’s growth rings, and it makes you have a comfortable sense of being home in a virtual hug from Mother Nature.

When wood stave (natural slices of wood) is applied to a door core material, the wood will move to accommodate the environmental challenges and circumstances which it is presented with.
In the case of cracking wood stave doors, the surface crack is the nature of the wood to adjust to the tension of the door’s core. The wood is still trying to provide you with the best door ever, so it sacrifices the surface finish and moves to accommodate the needs of interior core of the door. A crack-resistant finish will result in the tension being spread over a larger surface area, developing a warped or cupped door which can be more problematic to deal with than a surface crack.

Natural wood stave doors will move, warp, bend, twist, and crack, unless they are uniquely engineered with the proper composite materials to result in a wood door that does not move.

Sing Core provides architects, custom door manufacturers, and millworks with the best structurally sound composite door core which is lightweight, insulated, dimensionally stable, and stronger than steel pound-for-pound. Properly laminated materials, including the application of the natural wood stave to the patented torsion box composite core in concert with patent pending straighteners, delivers to clients a natural wood stave door which can be guaranteed to remain warp-free, including a full structure warranty, for an unprecedented 50 years.

A cracked natural wood surface door is likely due to a moisture problem, which varies in intensity between interior wooden doors and exterior wooden doors. Any wood door needs to be properly acclimatized to avoid cracking and excessive movement, also contributing to a wood’s tendency to move would be considering the way in which the wood was sliced, cut, or sawn.

Wood stave is a much higher concept in wood-faced doors than wood veneer as wood veneer which is not susceptible to cracking or warping, it is very thin and cannot easily be repaired when slightly damaged. Wood stave is a thicker natural wood product which can easily be maintained using basic woodworking skills.