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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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WOOD VENEER 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."

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.

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.

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.

Ask us if you have any questions.

 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.

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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.

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

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How to Join Sing Doors

When your beautiful new Sing Core door sections arrive, it is important to take the time to glue the door together properly. 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.

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 sledge hammer, 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.

Sing Beam

If you have a very wide and large door, you might consider ordering a straight Sing beam to keep the top and bottom of the door in process perfectly straight in addition to the temporary guide to make sure the door perfectly flat the entire length.
Let us know if you would like sing beams added to your order and we would be happy to oblige.

Summary

The flatness of your door depends on how flat your sections are when they cure. Any warping in the mold will be retained once the glue drys, so it is vitally important that you clamp up your sections precisely straight.
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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.

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How to Measure a Warped Door

How can you tell if you have a warped door or not?

There is an industry standard method of determining whether your door is warped or not.

To determine whether you have a warped door or not you will need a length of string (longer than the length or height of your door) and a measuring stick or tape measure.

a) Tape one end of the string to the edge of the door and the other end to the opposite edge of the door.

The string should be straight. If there is a gap between the string and the door’s surface, you may have a warped door.

b) Measure the gap between the string and the door’s surface area.

If the gap is greater than ¼” your door is warped (according to AWI standards for 1-3/8 to 1-3/4 inch doors 3’-0” to 3′-6″ x 7’-0”).

c) If the length exceeds 7 ft. AWI standard applies to any 7 ft. section. Apply string to any 7 ft. span.

Contact your door maintenance company and send them two photos.

d) [1] Photo of the length of the string which shows as much of the door in its entirety, or at least from one end of the string to the other. Then [2] a closeup photo of your measurement of the gap.

Armed with these two photographs, which can easily be emailed to the millwork or door maintenance company of your choice, the recipients will be able to determine how best to approach the repair or replacement of your warped door.

You might consider replacing your warped door with a professional door which has Sing Core inside which can be guaranteed not to warp, bend twist or otherwise fail so as to avoid this pitfall in the future.

For more information, see: Door Warping vs. True Flat

What if my door with Sing Core inside is warped?

The same standard method of determining and measuring any door with Sing Core inside is used just like any other door (as noted above).

Contact Sing Core about your concerns about your door being certain to include the two photos as noted above.

If you have purchased a professional door with Sing Core inside, you may be the recipient of a replacement Sing door.

Note that upon arrival and un-crating of a door with Sing Core inside, a door may appear warped (and indeed it will be measurable). This is normal for a door which has been packed and in transit. Stand your door on its edge at least twelve inches away from any adjoining surface area, allowing it to acclimatize for up to 72 hours. Measure your door again and you will find it to be straight and true. If not, document for warp (as above) and contact Sing Core.

In the event that a professional door with Sing Core inside is warped (which is highly unlikely) your help in determining the cause of the door’s warping is appreciated. Please assist documenting the chain of custody of your professional door with Sing Core inside, including the millwork or door company which finished the door, and the installers who installed the door, to help us insure your replacement door remains warp-free.

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Standard-sized Doors for Retail

You asked for it, and Sing Core delivers, and as always, goes the extra mile.

For years, Sing Core has been providing the most exclusive solutions for large high-end door manufacturing, made available to only the best custom door manufacturers and millworks. Since we started supporting the door industry rarely does a day go by when we aren’t dealing with many requests for standard-sized doors for retail installations.

Unfortunately, since our factory is only set up for one-off custom large doors, the cost of making a standard-sized door with Sing Core inside is just too cost prohibitive, except in the most high-end jobs with a large budget for architectural doors. That is, until now.

Introducing Retail-ready 3-0 x 7-0 Sing Doors

Financed by our success of building high precision Eco-friendly one-of-a-kind warp-free doors that can be guaranteed not to warp, bend, twist or otherwise fail for 50 years (no other door company in the world can do that without having Sing Core inside), we have created a new division at our factory to build standard-sized 3-0 x 7-0 doors with Sing Core inside.

These warp-free flush doors are priced to sell, so that you can now provide the best doors to your retail clientele featuring Sing Core inside at a price point that is attractive and affordable.

Priced for Retail Kick-off Event

We are kicking off this new line of retail-ready doors in the most requested size: 3-0 x 7-0 doors, available for either interior or exterior applications. You also get to choose from paint grade, veneer, or natural wood stave Sing flush doors starting at $xx.xx each, with no minimum order.

Standard lite cut outs are available (8 styles to choose from). Doors with window openings cut require a 10 piece per cut out design minimum order.

Strongest Lightest Weight Doors in the World

Kick My Door

As we kick off this event, inventor Peter Sing invites you to kick his door, which is so strong, “You will break your leg before you crash my core.”

Sing Core is renowned world-wide as the only way to build a lightweight door using high precision (+/- .006 in. tolerance) core material which is stronger than steel pound for pound (660 PSI) for building doors that can be guaranteed not to warp or fail.

Note: Kick doors with Sing Core inside at your own risk.

Ready to Ship Unfinished Doors to You

As always, Sing Core does not finish, provide hardware, or pre-hang doors. Prices are for unfinished door slabs only.

To sweeten the deal even more, we will ship to your company direct. Sing custom doors are only shipped to millworks and custom door manufacturers only, because finishing and creating the ultimate warp-free door depends highly on the craftsmen who create the finished product.

Since these are standard 3-0 x 7-0 sized doors, there is plenty of hardware and retail-ready framing material available over-the-counter, so these doors do not require the same attention to details as our custom-sized doors. The only thing is, we need to trust your skills in finishing the door.

5-year Warp-free Guarantee

Assuming the door is adequately sealed and finished, Sing Core guarantees every one of these doors, both interior and exterior doors, to remain warp-free for 5 years, including full structure warranty.

Now you can order with confidence and at special retail-ready pricing your choice of 3-0 x 7-0 doors with Sing Core inside.