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Current Trends Don’t Wait

This is an update to let you know what the current trends are, here at Sing Core.

The biggest trend is this:

Warped Doors… Help!

We have been getting a lot of calls from professionals who have installed large doors who are now in trouble because those doors warped. As you know, Sing Core is the only way to build a large door that does not warp, and we guarantee it for 50 years.

If you are in trouble and need that door right away, we can do it for you, but you will incur rush fees. You will be far better off by getting the door assistance from Sing Core in the first place.

Don’t wait. Let Sing Core save you the headache, lost time, and expense of having to replace that high-end door later. According to the reports of incoming requests, the large doors are having to be replaced within six months of the job’s completion. Don’t let this happen to you.

We Can Do It

When you work with Sing Core to help you make that big door, you are working with inventor Peter Sing’s True Flat Team that knows how to build warp-free doors. They have years of experience with all types of building materials and types of doors. They know what can be done, what cannot be done, and have patented and patent-pending technologies to make an otherwise potentially warped door, warp-free guaranteed.



Ordinary vs. High-end

This is the difference between an average door and a high-end door: Precision over time. Out of the gate, Sing’s door core sports +/- .006 in. tolerance which is the highest precision door core to start with. That’s not including all the anti-warp technologies that are available to the team to make sure your door does not warp over time.

Built to Your Specifications

We can solve the issues that you are facing with your door. We can make the door lightweight, no matter what the size, but if you need to match a weight requirement, we can help you achieve that as well. Your door with Sing Core inside can be built according to your specifications.

Some Other Trends We Are Seeing

Grooved Doors

Architectural doors with horizontal grooves appear to be all the rage. If you have been doing this for a while, you already know that routing kerfs, plow cuts, furrows, or V grooves is compromising the door’s structure and may lend to increasing the door’s tendency to warp, but not if it has Sing Core inside.


High precision 1/16″ groove in 1/8″ skin

We can pre-cut grooves, even deep grooves (we have a special process for extra deep grooves) for you, without jeopardizing your non-warping guarantee. If you are doing a high-end job, you should start with a high-end core, like Sing’s warp-free door core.

Curved Doors

Unlike arched doors, curved doors must be very exacting to match the curve of the structure in question. The last thing you want is for that door to move, rendering the door unusable. This is extremely important for curved doors, that they keep their shape consistent over time.

Sing Core can match any curvature in your perfectly curved door and guarantee maintaining is shape in longevity. Nobody else can do that and guarantee it for 50 years.

CNC Carved Doors

CNC carved doors are really being seen as on the increase. These doors can be rather large, and you will need enough wood (meat) to carve into, and there are varying landscapes being carved into the grain, which is an invitation to warpage.

To prevent future warping doors, these CNC artisans are making sure they have non-warping Sing Core inside, specially designed and reinforced to accommodate both the natural wood grain and the varying depths being carved throughout the door’s surface area.

How Can We Do It?

How can we consistently make the doors that are impossible for other door manufacturers to create? Because it’s all we do. We have been doing it for years and will do it for many more.

We are not saying that other companies cannot provide their clients with 50-year warp-free extraordinary doors, because we work with the biggest and best door companies to assure that they can give this level of service and precision to their clients. They trust us with giving them what they need to deliver their best to their best clients.

Let us help you deliver the best big doors to your best clients.


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Top 4 Ways to Make the Best Door with Sing Core Inside

Here are the top 4 ways architects are making the world’s best doors with Sing Core inside.

1. Check the Size

2. Check the Thickness

3. Check the Skin

4. Check the Sing Core Inside

1. Check the Size

Even the biggest doors, can save the budget and increase performance by making minor adjustments in the size. How tall? How wide?

2. Check the Thickness

How thick is your door? Increase a 1.5-inch door to 3 inches and enjoy 4-times the strength with a weight increase of as little as 5 to 10 percent. A little thickness can go a long way.

3. Check the Skin

Some door skin material is more accommodating than others, different wood species have varying degrees of challenges
Veneer. Very thin veneers are best laid on a very smooth layer of MDF for flawless hot pressing. You will find Sing Core inside the best high-end veneer doors.
Wood Stave: Wood stave skin is sliced and sanded from larger wood stock. We suggest 1/8th inch or 1/4 inch if cutting designs or grooves into the surface.
Paint Grade. MDF is again, an amazingly smooth surface to paint upon for outstanding paint grade doors.
Covered Plywood. Plywood can be covered in a wide variety of skins, such as fiberglass, vinyl, HPL, Formica, ceramic, or metals, such as aluminum, or steel.

See: Other Door Skin Types

4. Check the Sing Core Inside

Sing Core is not just one patented product, though it did start that way. The sing Core door solution now includes many different patents and patent-pending techniques that help to solve the problems facing architectural doors of any size or style, from door blanks to stile and rail doors. By making slight adjustments in the door’s measurements or other ingredients, you could reduce the cost of mandatory engineering and technology to keep the door straight, thereby reducing the overall cost of the door. This is the specialty of Sing’s True Flat Team.

How Are Architects Designing the Best Doors in the World?

Architects are the most discerning creators in the world because they desire to push the design envelope to the next level? One of the most dramatic impacts they can make on a new design is to apply their imagination to the structure’s first impression.

The project budget may not allow for a structural design that is so unique that anyone who approaches the project knows they are encountering a unique structure and experience based on the style of the structure. The next point of impact is the front door.

Sing Core empowers architects to create these one-of-a-kind creations that serve as the main entrance to the structure that represents their efforts to share their creativity and imagination with the world. See these Impossible Doors.

How to Design the Best Door in the World

Size Makes a Difference

A common approach to an architectural front door is to create a door of immense size. Architects understand that there will be issues with incorporating a huge front door. The first challenge they face is balancing issues associated with weight and strength.

Door Weight

Big doors are heavy. The bigger the door, the heavier the door. Big doors can be dangerous to install and can be dangerous to use. Large oversized heavy doors are expensive to make, handle, ship, install and maintain over time. Note: Door hardware is based on the weight of the door, a very heavy door, will require very heavy duty and expensive door hardware. (In some cases just the hardware will cost more than the door.)

Door Strength

At some point, as the door size increases, strength and dimensional stability decline. A very large door presents many challenges with trying to keep the door straight and true, so that it not only looks good but operates flawlessly over time.

Door Skin Makes a Difference

The exterior surface of the best architectural doors in the world presents their own set of challenges, whether they be exotic wood (natural wood grain, while it is beautiful, poses the most problem for potential movement due to the nature of the wood’s grain), hot rolled steel, or any other type of surface material.


High precision veneering requires the smoothest surface for hot pressing, so we use our lightweight MDF which also has excellent adhesion. Thin veneers (like .030) can be very fragile and are susceptible to damage easily, so for high traffic doors, we suggest upgrading wood stave for strength and longevity.

Wood Stave

Wood stave is sliced and sanded from larger wood stock. We suggest 1/8th inch (1/8 inch compared to ¼ inch looks identical but less chance to move) or 1/4 inch if cutting designs or grooves into the surface. It can be challenging depending on the wood species and may require more Sing technology inside to keep warp-free.

Paint Grade

MDF is again, an amazingly smooth surface to paint upon. Assure your paint-grade doors are beautiful as you are coating them with high-precision finishing paint.

Covered Plywood

Plywood can be covered in a wide variety of skins, such as fiberglass, vinyl, HPL, Formica, ceramic, or metals, such as aluminum, or steel.

Door Thickness Makes a Difference

Managing a very thick moving door can present challenges, even more so if the door is very thin, and requires a great deal of engineering to make it stay straight and true over time.

Exterior Doors

Exterior doors are by far the most impressive and challenging architectural doors to consider, because they are used regularly, and one side of the door is exposed to opposing environmental conditions, increasing the door’s inclination to favor one side over the other, resulting in a warping condition.

Extra patented and patent-pending Sing technology is necessary to counteract these conditions, and therefore Sing’s True Flat Team must be aware of the conditions this door may be exposed to in order to have the necessary anti-warp technologies inside prior to manufacture or installation,

High Precision

When it comes to high precision, no other door substrate can compare to Sing Core. Go ahead and pull out your micrometer and measure for yourself. Sing Core sports the highest tolerances at +/- .006-in. If your job demands high precision, it doesn’t get any better than Sing Core.

Perfectly Straight

In the world, as we know it, there is no such thing as perfectly straight. The AWI does advise that there are tolerances allowed for straight non-warped doors, and the hardware manufacturers create mounting and articulating equipment to accommodate these specifications.

But this one thing we guarantee, that your door with Sing Core inside will be the closest thing to perfectly straight possible, and it will perform better than any AWI standard.

50-Year Guarantee

Your door, with Sing Core inside, can be guaranteed not to warp, bend, twist, cup, delaminate, otherwise fail for 50 years. No other door in the world can offer The Only 50 Year Non-warp and Structure Guarantee as Sing Core can.

Maybe you will agree with our clients who say,

“Sing Core is The Only Way to Build High End Large Doors.”


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Impossible Doors Our Specialty

If you would like to know more about how to design a door with Sing Core inside, click here.

When it comes to building the most unique doors, especially large, oversized doors of any size (up to 20 x 60 ft. or more), type, or style of door, Sing Core’s True Flat Team knows how to bridge the gap between impossible and possible, by applying many variations of their patented and patent-pending technologies to make it happen. Some of our most recent projects include curved doors, Sing stile and rail doors, new patent pending Sing Core stile and rails, long-span wood stave planks, CNC door carving blanks, large sliders with man doors, billionaire home doors, and hot rolled steel doors.

When an architect’s visionary project is coming to life, it is common for the project to come to a halt when the main door (this inspired visual centerpiece of the project) presents problems for the millwork or door company in charge of the rest of the door schedule.

Oftentimes, the most common response is, “We will build it, or have it built, to your specifications, but this door will be placed on a separate rider, excluding it from any other warranty that may be covering the remainder of the door schedule.”

The door company will probably not even bother with the manufacturing of this piece, as it is too costly to re-tool to build it and it is likely to fail not long after installation. So, they will sub it out, and have an artisan millwork build it, freeing them from any responsibility for follow up maintenance calls regarding this piece of the job.

That is, unless they are working directly with Sing Core.

Many of the biggest door companies and high-end millworks are back into the specialty door business because they have partnered with Sing Core.

Why Sing Core?

Sing Core offers solutions that make impossible doors possible, and not only possible, but these magnificent works of art can be guaranteed not to fail, as they are covered by Sing’s

50-Year No Fail Guarantee

These enormous or one-of-a-kind unique doors are nothing short of amazing, with unparalleled service records and longevity, and they are guaranteed not to warp, bend, twist, cup or otherwise fail (including full structure and lamination warranty) for 50-years. No other door in the world comes with such an impressive guarantee unless it has Sing Core inside.

The Most Unique and Challenging Doors

Large doors are not the only unique and challenging doors to come to the attention of the True Flat Team. Many other types of architectural doors will present a huge list of problems that will send door engineers, designers, and custom door makers running for cover, yet they are no problem for the Sing Core factory teaming up with the sophisticated door manufacturer or millwork to accomplish. Like these:

Curved Doors

Curved doors are unique specialty doors, that require precise curvatures, especially if they are being newly installed in a pre-existing wall or structure that is curved. Matching the curvature of the door to the existing wall can be extremely difficult, but the True Flat Team at Sing Core make the perfect curved door to match any curved wall or structure, while still guaranteeing the door for 50 years to perform without warp.

Sing Stile and Rail Doors

The Sing-style of stile and rail door is a departure from traditional stile and rail door technology. The clients who prefer the Sing-style stile and rail door are looking for characteristics that are unavailable via traditional door building methods but still retain the look and feel of a traditional stile and rail door. Specifically, they are looking for a stile and rail door that is impact resistant, insulated for both sound deadening and climate control, and of course guaranteed for 50 years. Sing Core accomplishes this by building the stile and rail face on top of a patented warp-free core.


Large Thin Stile and Rail Framed Doors

Sometimes the architectural door specifications are unusual, like this wood-framed traditional stile and rail door with a large glass lite opening. This is a 14 foot tall door that calls for only a three-inch wood stile and rail surround to hold the glass. This is unusual and would be hard to accomplish with standard door building methods, and it was even a challenge for the True Flat Team, which led to their creating a new type of stiffener, which is now patent-pending technology. Now, standard stile and rail doors made with Sing Core stiles and rails can be guaranteed to remain warp-free for 50 years using new patent pending Sing Core stile and rails.

20-ft Span Wood Stave Garage Door

This is just one example to the many kinds of garage doors that Sing Core has helped to make possible. In this case, the architect insisted on 20-ft spanning warp-free wood stave planks, that any other way would have been impossible. 50 years from now, will be just as straight and true as freshly installed thanks to Sing Core and their long-span wood stave planks.

CNC Carved Doors

These beautifully CNC carved doors would be impossible to keep straight as they are accentuating the wood’s natural grain which is already trouble brewing, if not for the warp-free Sing Core working hard behind the scenes, deep inside to keep these doors perfectly and truly flat even though they are 107-inches tall using Sing CNC door carving blanks.


Large Sliding Doors with Man Doors

When it comes to large sliding doors with man doors, there is really only one way to do it with a high degree of precision. The large sliders with man doors must remain decidedly straight and true in order for the man door to operate seamlessly, plus, because there is Sing Core inside, you get the added benefit(s) of getting lightweight, high strength, fully insulated for sound and climate control, and our 50-year warp-free guarantee.


Billionaire’s Exotic Home Doors

These massive natural teak doors have Sing Core inside to keep them from warping and also to provide added protection from outside interferences to privacy and the elements. Not everyone can have their whole homes fitted with Sing’s doors, but what a great feeling it is having done so with Sing’s billionaire home doors.


Hot Rolled Steel Doors

Hot rolled steel doors can be a challenge, especially if they are very large. Normally, large hot rolled steel means a lot of weight needs to be articulated adding stress and strain to the frame, hardware, and structure if used very often. Patented and patent-pending Sing Core reduces the weight greatly while enhancing the door’s characteristics enabling one to install a man door or open and close a mammoth-sized hot rolled steel door easily.


When Bigger is Better

Thanks to the patented and patent-pending technologies in the hands of the True Flat Team at Sing Core bigger does not necessarily have to mean heavier or big troubles are ahead. With Sing Core inside your big doors can be lightweight, high strength, fully insulated, and guaranteed warp-free for 50 years.

If you would like to know more about how to design a door with Sing Core inside, click here.

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How to Build a High-End Stile and Rail Impact Door

Being in the business of helping the biggest door manufacturers and high-end millworks building the best doors in the world, we thought we might let you in on a little secret. Sing Core is world renowned for building the best enormous doors that are lightweight, high strength, fully insulated, and guaranteed to perform warp-free for 50 years. But did you know that we also make the world’s strongest lightweight and insulated stile and rail doors?

The popularity of stile and rail doors has been around for years because, number one, they look amazing. They have a unique appearance as they are manufactured of panels of various sizes. The most popular, and it is the one you are most likely to think of when you think of a stile and rail door, is the six-panel door.

Hands down, this is by far the most popular design. The traditional six panel door is made up of 15 individual wood pieces with alternating grain orientation and all the components are assembled by varying means depending on the application of the door.

If the best feature of the stile and rail door is the undeniable appearance of the door, the second-best feature of the stile and rail door is it’s ability to stay relatively straight over the life of the door. This is accomplished by varying the grain orientation of all the individual panel pieces, which push and pull against each other, unlike a traditional solid slab door which can move wildly at any time or according to any change in the environment.

But the biggest disadvantages include very low insulation value. This means they are not well suited for climate control or sound reduction, and for high-end clients, though they love the appearance of the panel doors, they are not very strong.

If you build stile and rail doors, you may need to know how new technology can lower your labor costs and increase your productivity when building all types, styles, and designs of doors. Sing Core has done it and proven it backed by the best guarantee in the industry.
We can help you:

  • Meet your production needs – Fast Delivery
  • Exceed your quality expectations – High Precision
  • Reduce your labor cost – Money Saving
  • Structural guarantee – 50 Years!
  • Custom sizes – Any Size or Weight
  • Fully insulated and sound deadening door panels

The Sing solution is to build your stile and rail door on top of the patented Sing Panel Door Substrate invented by Peter Sing. Sing’s substrate is lightweight, high strength, fully insulated and comes back by the only

50-year Warp-free Guarantee

in the door industry.

Now, you do not have to settle for a weak stile and rail door because your stile and rail door can have Sing Core inside.

How to Build a Stile and Rail Impact Door

The first step is to start with Sing’s patented core which is built of small metric vertical grain torsion box where the voids are filled with foam for insulation, and this is sandwiched between two stress skins.

The next stage is where the expertise of the millworks and door manufacturers come in. Instead of manufacturing the door out of individual pieces of wood stuck together, the panel design elements, as in our six-panel door option shown here, are added to the surface of the door.

This gives you the appearance of the traditional six panel that we all have come to love, but if your six-panel door has Sing Core inside, you have the lightweight for panel doors of enormous size, or adjustable weight for smaller doors, with all the insulation and incredible unbreakable strength.

Sing says, “If you kick a traditional stile and rail door you will break the door, but

“If you kick my door, you will break your leg.”

(Don’t try this at home.)

This is just the beginning. Sing can help you make any kind of door. Sing Core is featured in all kinds of doors and is highly sought after when creating replacement doors is historical restorations, especially if they are large doors which are problematic for maintenance because they do not have Sing Core inside. We do not sell our products to homeowners, door stores, or door shops. We do not sell our products to general contractors without door finishing facilities or capabilities. We mainly deal with door manufacturers and millworks which have experience to build high-end doors.

Problem Solved.

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Get Your Custom Super Large Door Substrate in 1 Week

Did you know you can get your custom super large door substrate in 1 week? It’s true, thanks to inventor Peter Sing’s patented and patent-pending large, oversized door core technologies and his factory that is 100% dedicated to manufacturing nothing but large doors for you and your clients, you can get these enormous door blanks created in as little as 1 week. This is an unprecedented turnaround time and also comes backed by Sing’s full warp-free and structure guarantee for 50 years. You won’t see an offer like this anywhere else in the door industry.

Are You Getting Tired of Being Disrespected and Given Long Lead Times for Big Doors?


Now you don’t have to wait around for long lead times, as much as seven or eight months to get going on your project when you are waiting on the most important part, that big door.

How Sing Core is Included in Your Project

Often the Architect specifies Sing Core in your challenge, large, curved, arched, or specialized surface skinned door. In other cases, the door manufacturer or the millwork building the door says,

“There’s only one way to make this door: 

with Sing Core inside.”

And they are right. Peter Sing’s inventions are the only known methods of producing a lightweight, high strength, fully insulated door blank that will not warp, bend, twist, cup, delaminate, or otherwise fail, and can be guaranteed to remain fail-free for 50 years.

Can I Get a Door from Sing Core?

Sing Core does not make doors, but we help door manufacturers and millwork make the best doors with our patented and patent-pending technologies as the foundation.

The Door makers use our substrates as the base material to create their one-of-a-kind works of art that our clients have learned to appreciate and enjoy. It takes a concerted effort of Sing’s True Flat Team, assisting in the design and creation or the door and the highly skilled door builders and millworks to finish and bring these beautiful doors to life.

What Does Sing Core Do?

We provide the lightweight, high strength, non-warp door blanks with fast delivery so your big door does not have to hold up your production time. Our True Flat Team helps to design the core material from the inside out, takin into consideration all the specifics necessary to create a warp-free door.

What Does Sing Core Need to Know?

There are many details about the door that go into the building of the door’s substrate that Sing’s True Flat Team needs to know before they can go about building the substrate. First, and most obvious, is the size of the door. Doors over 8 ft. tall start to introduce challenges into the design. Then there is the door type. Will it be a pivot door, hinge door, sliding door, or other type of door? Where, geographically, will the door be installed? Will it be an exterior door? Will it face the elements or be isolated? What surface material is desired (some provide more challenges than others), and much more. With data in-hand the team can develop a warrantable substrate.

How Fast Can Sing Core Do It?

We can have your custom substrate ready for the manufacturer to finish in as little as 1 week, and we answer this call by clients who would rather not wait for our standard turnaround time which is four to eight weeks.

What Does the Door Mfg. Do?

We provide the fail-free door blank to the manufacturer (door builder or millwork) who cuts lite openings and hardware access locations in the door, installs glass if specified, hardware, finishes, and hangs the door. The door manufacturer or Sing Core (or a combination of them both) may be responsible for applying the final layer(s) of skin material.

How Easy is it to Get a Price Quote?

It’s as easy as 1, 2, 3. Within minutes you can submit a price quote for your specialty door, and instantly see a 3-D graphic or your proposed door and a preliminary architectural drawing of your door instantly. All you need is the length, width, and thickness of the door you want and what skin you would like to see on your door. (See How to Order and What to Expect)

How Can I Get a Door with Sing Core?

The easiest way is to have your architect specify a Sing Core door in your project. Other ways include contacting your custom door manufacturer or millwork and requesting that they build your door with Sing Core inside.

Can You Guarantee Any Door for 50 Years?

Unfortunately, we cannot guarantee any door for 50 years. If the door cannot be built to specs and guaranteed for 50 years, we will not participate in the building of that door in that respect. But if the architects, designers, and engineers can work with Sing’s True Flat Team, with a little re-engineering and ingenuity, it is highly likely that Sing Core can help to produce a door that can be guaranteed for 50 years.




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How to Order and What to Expect

Answering your questions about how to order, how to solve your oversized and super large door challenges, and with patented and patent-pending solutions from Sing Core.

In these unprecedented times, our sales staff are telecommuting and may be unavailable to take your calls, but everything you could possibly want to know is online, and readily accessible to you.

Just click on the orange search tool found in the upper right-hand corner of your screen

Then enter what you’re looking for in the dropped-down top of your browser and hit ENTER

The SingCore web site is full of a vast array of valuable information that is instantly available to you by using our on-site search tool.

How to Order and What to Expect

We show you how.

Easy Pricing Method

You can use the same method as our previous customers.

All you need to know is the height, the width, thickness of the door, plus what type of surface material you would like.


To start, click on the orange PRICING button…

You will see our fillable form with blanks for each detail of your application.

First you will see the Company section. Enter your company name and website here.

The next section is for your contact information.

Next you will see the section titled ‘Project’. This is looking for the basic information about your project. You can create a project name, input the project’s address, and the date you need your panels.

The following section will be titled ‘Panels’ and is looking for the specific details for your application. There will be a blank to enter your door’s ID, which is for your use and especially useful if ordering multiple doors. The other blanks will look for dimensions, surface material, thickness, and you can decide here if you want your panels trimmed, untrimmed (raw), light openings, and add edgebanding.


Instantly, you can see a basic 3D rendering of your door based on the information you entered online,

Click on SHOPS

and you can download the drawing of your door based on these preliminary steps.

This is an example (above) of a free instant drawing available for you to download before even completing your price quote request. Just click on SHOPS

Press Submit and get a basic price quote.

Once your price quote is submitted, a salesperson will present you with a preliminary invoice for the details you entered.

How Much Does a Sing Core Door Cost?

You will receive your price quote via email.

There are more things involved in accurate pricing which is far more involved than this simple pricing form. That’s why,

Price Quotes Are Not Final

So many details go into the actual design and pricing or your door, your initial price quote may just be a round number which is in the general ballpark of the door you desire with Sing Core inside.



Sales Staff

There are many options and considerations which may not have been taken into consideration in your initial price quote. Once we have received your prices quote request, you will be assigned to one or our experienced sales staff who will help guide you through the rest of the process.

The Entire Sing Team

The entire Sing Team is here for you to help you get the best door in the world for your door dollar. All details will be taken into consideration.

Will the door need to be redesigned to meet your expectations?

What geographic area of the world is this door going to be installed?

Is the door too thick or too thin?

Is it an interior door or exterior door?

How warp resistant is your desired exterior mater



If an exterior door, what direction will it face?

Do you have insulation requirements for sound proofing or temperature control?

What kind of finish will be applied to the door?

What kind of hardware will be used on this door?

So many things go into making sure that you get the best door in the world, and the only door in the world that comes backed by Peter Sing’s unsurpassed 50-year guarantee.

50-Year Warp-free and Structure Guarantee

Only doors made with Peter Sing’s patented and patent-pending core inside come fully guaranteed not to warp, bend, twist, or otherwise fail, for a full 50 years, which includes structure, even warranted against delamination over time.

“No matter what you order, if we cannot guarantee it, we will not do it for you.”  -Peter Sing

What Kind of Skin Do You Want?

Normally, what we do the best is the smoothest for finishing, and any skin can be applied.


What About My Budget?

Sometimes, one of our clients might be facing a limited price budget. Oftentimes, we can make changes in the design, size, details, or finishing of your door with Sing Core inside to meet any limitations of your price budget.

Check with your salesperson to see if Sing’s True Flat Team can help in re-engineering your door to meet your budget constraints. Many times, we are able to do this for our clients when necessary.

When you submit your price quote request, you will know ahead of time, roughly the weight, how straight it will be, and how strong your initially designed door can be.

You do not want to spend 50 or 100 thousand dollars on a door that cannot even be guaranteed for 1 year. If you are looking for the world’s best door with the best and only 50-year guarantee, then Sing Core is the right company for you.

We will work together to build the best door in the world for you.


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Sing Core Update

We produce patented and patent-pending door blanks for high end door manufacturers and mill works in the industry.
Sing Core door blanks are most popularly used for large sliding doors, pocket doors, pivot doors, hinge doors, and carriage doors. Most commonly we create door blanks for doors that are 8 ft. to 20 ft. tall, and range from 4 ft. to 25 ft. wide.

On average, how much do Sing Core panels weigh?
approximately 2-3 lbs. per square foot. If you double the thickness, you quadruple the strength while increasing the weight by only 5-10%.

How straight is a Sing Core panel really?
We guarantee the same or better than the AWI standard. We are always able to achieve the most dimensionally stable reinforced insulated panel than any other door core. This includes very large and thin doors which pose the most challenge to remain straight. Only our patented and patent-pending technology is able to achieve this. If other door manufacturers are unable to guarantee your doors, please contact us. We will be able to ensure your doors will be straight before we even produce it for you. We are the most experienced non-warp, high strength, and lightweight door panel manufacturer in the world.

What kind of skins do you offer?
The most popular skins we offer include veneer, wood stave, metal, MDF/paintgrade, or marine plywood for exterior applications.

What type of style or design door can you make with Sing Core?
You can add trim or moulding to create a design or can use a CNC machine to carve any design you can imagine, from classic 6 panel styles to complex artistic designs with or without light openings. The possible designs are endless, but Sing Core creates the strongest lightweight and non-warping door panels in the industry. Every door comes guaranteed by inventor Peter Sing.

What type of home uses Sing Core door panels?
Our door panels are used in a wide variety of applications, but most commonly in high-end luxury homes; homes over 8 million dollars for our extremely large door panels.

What type of trade professionals does Sing Core service?
Architects for luxury homes, high-end millworks, nationwide high-end door manufacturers, and general contractors with access to a millwork. We do not sell our products to home owners.

What’s new besides providing the best large door blanks?
We are starting to build standard sized unfinished door blanks for door manufacturers for them to build affordable high-end stile and rail doors. We have been producing MDF skinned paintgrade door blanks in large quantities. Our production line is capable of building hundreds of standard door blanks per day. If interested, send us a schedule of the doors for your project and we will be able to make your door panels at an affordable price; including your large doors. We don’t and are not capable to build doors, we just supply the most straight, non-warping, high strength, lightweight door panel for door manufacturers or millworks to build the highest quality doors at an affordable price.

Who does Sing Core sell their products to?
Most Sing Core door panels are sold because they are specified by high-end architects while designing their multi-million dollar projects or by top millwork companies building high-end doors for very demanding luxury homes.  Luxury homes often require large doors for various applications in the home; Sing Core large door panels could be used for sliding doors, pocket doors, or pivot doors that need high precision, high-strength, lightweight, and non-warping door cores.

A millwork company that has been using our patented door technology for over 10 years told us, ‘We have not had any issues with our doors since switching to Sing Core.’  Before, even if they are the top door company in the USA, oftentimes they would face recalls which is their worst nightmare.  With our Sing Core innovations and revolutionary technology, we can offer the only 50 year guarantee in the door industry.  They love our 50 year guarantee, as most manufacturers in the industry only offer 1 year guarantee or no guarantee at all.  Call us if you would like to have that peace of mind.  We provide the best door panels and peace of mind in the high-end large door industry.

We also work with general contractors to provide Sing Core unfinished door panels to their designated millwork to properly finish their doors.

We do not sell finished doors.  We do not sell our door panels or substrates to people outside of the building industry’s door designers and manufacturers.  We do not sell to homeowners or door distributors.

Architects Love Sing Core
Architects spec Sing Core in their huge doors because they trust Sing Core to provide the high-precision, lightweight and dimensional stability, which makes them look good when it comes to these oversized egress points, building credibility with their clients. They know there is no known door construction method that can accomplish such a feat.

Let us know if you are interested to learn how to build any style or design of door with Sing Core panels using a CNC machine subcontractor. You can find CNC subcontractors by searching the internet with phrases like “CNC wood co-op” or “CNC wood shop for rent.” You can find CNC shops to be rented if you are or know a CNC operator. See picture of possible doors you could build by using other wood working machines and talents.

Besides very large doors, standard doors in large quantity, Sing Core technology proves to be useful for all different industries. Click here to see the endless applications of patented and patent pending Sing Core.

High-end doors are often sold for tens of thousands of dollars and should last a lifetime. Door companies usually do not offer any guarantees for doors over 10 ft., the most they offer could be 1 year only. Sing Core will provide a written guarantee for 50 years. This is why Sing Core is recommended by our fellow door manufacturers to use our products. Let your friends and associates know that we are ready to service your needs if you are looking for peace of mind for any large door project you may have.

Sing Core is the best lightweight, high strength, non-warping material. Our product uses our patented and patent-pending technology to solve the issues associated with high-end large doors; not only in the US but in the worldwide – especially Europe. Often times, when a customer is building a $10 million and up house and use other door technologies, they tend to warp over time. This same customer then comes to Sing Core to solve their problems. No one else can create a door like this that can remain straight, and we guarantee it for 50 years.

When talking to a door company you have to ask questions like, “What is your guarantee against warping?” or “How long is your guarantee?”

Warping is the biggest issue in large doors besides weight issues or insufficient strength.

Often times you find out that the other doors companies do not offer guarantees for doors over 10 ft. and sometimes they have an issue guaranteeing doors that are less than 10 ft. The best guarantee they may offer is for only one year.

Lets say you have a $15-25 million dollar home and the doors are only guaranteed for one year. If you have problems with them and call the company after one year they will tell you that you no longer have any guarantee.

Do you want to deal with that kind of door or do you want to rest easy with Sing Core?

We guarantee our doors for 50 years. If the door does not last 50 years, then why would you want to spend tens of thousands of dollars for doors that aren’t reliable?

Sing Core has a deal with most high-end door companies in the US.

Our performance shows. We haven’t had a single door fail.

When a door fails, everyone panics; from the architect to the millwork to the general contractor and especially the high-end clientele. ‘It’s not just about the money, but the reputation.’

At Sing Core, we keep your reputation. No body else in the world can the issues with large doors.

You are a high-end professional, you do not want people to call you and complain that their doors have failed. We know how you can panic if a high-end customer complains. We can help you sleep better by avoiding the trouble a head of time.

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Why Architects Trust Sing Core

It is not uncommon for a contractor on a high-end project to come across a specification for Sing Core that they have not previously seen.

The contractor contacts Sing Core for more information about this particular job.


If you are a contractor working on a project that features Sing Core in the specs, you are privileged and must be considered one of the best contractors in your area because Sing Core is never featured in any project that isn’t considered by architects and designers to be the top in the industry.

You will be expected to be at the top of your game on this project, so congratulations to you for being awarded this project.

If I were to guess, I would think that your project is located the greater New York area. Your project is industrial or if it is residential, it is probably a home valued at 5 million dollars or more, and features at least 1 very large door.

Though shipped all over the world for many different applications, most of the products Sing Core helps to produce would fit this description.

What Next?

Know that working on such a high-profile or top-secret job like this must be handled properly, contacting Sing Core is your first order of business if you find this in your specifications.

Though we are primarily specified for the largest most important doors in America and around the world, Sing Core does not build the enormous doors for which they are so well-renowned.

What Sing Core Does

Inventor Peter Sing developed the patent and patent-pending technologies that allow large doors to be built without fear of failure in the very near future. Large doors, especially large wooden doors, have been problematic ever since architects and engineers began to create them, that is until the advent of Sing’s core. It enabled door engineers, manufacturers, and millworks to create enormous fail-free doors that could withstand the text of time.

When you contact Sing Core about the door or doors in your specifications, they begin reviewing and designing the interior of the door, the core, to support the surface material of the door so that it will counteract any potential for door warping, which is the main reason why large composite doors fail, especially if they feature a surface material that tends to move, such as natural wood grain.

Then, Sing Core coordinates with the team that will complete the door build. Surprisingly,

Sing Core Does Not Build Doors

They design the base material, conducted by Sing’s True Flat Team, that takes into account all the details of the build and creates the flawless substrate. Then Sing Core coordinates the rest of the process from attaching the surface materials and finishing the door. The door can then be sent to your millwork or door company, who can prep the door, install the necessary hardware, and ready it for installation.

When the specs callout a Sing Core door, it is not unlike Boeing’s 787 Dreamliner specifying a Rolls Royce engine. In the same way as you will see Rolls Royce specified in 35 different types of modern aircraft, you will find Sing Core inside a wide variety of doors around the world.

Contractor’s Millwork

As a contractor, if you work with a local millwork, they may have the proficiency to participate in this extreme door project. If so, Sing Core will work with them and send the unfinished door to them for finishing. You must have a great deal of confidence in your local millwork to trust them to handle such a job.

Utilizing only the best people in the industry on this elite project is of paramount importance to ensure your client’s satisfaction.

Why Architects Trust Sing Core

Architects, engineers, millworks, and door companies trust Sing Core because they understand the science behind Sing’s invention and know that “This is the only way to build such a door,” that will not fail.

Inventor Peter Sing backs all his big doors with his comprehensive

50-Year Warp-free Guarantee

Only Sing Core can create a fail-free large door core that can counteract any surfaces tendency to move without having to sacrifice precision or weight. Sing’s core boasts +/- 006 in. tolerances and weighs in at a fraction of other wood-based door cores. So, your big door doesn’t have to be so heavy that it compromises the structure or is dangerous to handle.

This ensures years of low maintenance enjoyment, which has put many door companies back in the business of creating large, oversized doors, something they had abandoned long ago because they wanted to cover all the doors in a project with their standard one-year guarantee, now these huge doors have an even better guarantee that their standard-sized doors because they have Sing Core inside.

Is a Sing Door Expensive?

Yes, Sing Core is more expensive to use than other door cores, and all the artists and craftspeople who help to create such a one-of-a-king piece of art, all contributing does make these doors more expensive that the average door, but your clients, the ones who have hired you and specified Sing Core on this project will settle for nothing more than the very best, at any cost.

And it’s up to you to see this project through to fruition.


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MDF Doors

In the artistic world of contemporary architecture design, creativity is the primary driving force expanding beyond the limitations of standard building materials. Architects and designers who yearn to express their artistic approach to groundbreaking structures and features with flair and high-precision detail are empowered by new advances in composite building materials, like Sing Core.

Creative visions come to life in the present day in projects with the most amazing degree of clarity and detail that might have taken thousands of artisan manhours in the past, by using patented and patent-pending Sing Core technologies with CNC artistry. The results can be most intricate and massive in scope and size using Sing Core.

MDF Doors

The primary focus of Peter Sing’s invention of Sing Core is in the large medium-density fiberboard (MDF) door venue. MDF is a fine surface material made of recycled wood products which makes it an excellent option for responsible use of wood fiber and sustainability for concerned architects and builders.

For voluminous designs on a budget, MDF is an inexpensive alternative when used in commercial and institutional projects when steel or prefinished wood may have been cost-prohibitive.

Admittedly, the bulk of Sing’s core being featured in MDF doors is far more practical than artistic. Using Sing’s core and assisted by his True Flat Team, the largest door companies and most prominent millworks in the country are able to create a lightweight MDF door that is stronger than any other MDF door. This enables door manufacturers to create lightweight MDF doors of immense size that can be guaranteed not to warp, bend, twist, or otherwise fail for 50 years.

The number one MDF door application of Sing’s MDF door substrate is in Paint Grade Doors.

Paint Grade Doors

When you are looking for the smoothest painting surface, then an MDF paint grade door is a clear choice. It is quicker and easier to produce a paint-ready door made of MDF over other wood door products.

The only problem is that MDF is heavy and unstable for heights exceeding 8 feet tall, or widths greater than three-an-a-half feet. Where MDF is concerned, size does matter.

To use MDF for large oversized paint grade doors, you need to get into the door engineering details of the door. Thankfully, the biggest and best door designers, millworks, and door companies are able to depend on Sing’s inventions and his True Flat Team to work out the details of the design.

The result? A lightweight, high strength, perfectly smooth flat surface ready for that special treatment, your expert paint, and great result. But that’s not all. These doors are guaranteed unlike any other door known to man.

50-year Warp-free Guarantee

Doors created with Sing’s composite of patented and patent-pending technologies are guaranteed not to warp, bend, twist, or otherwise fail for a full 50 years. No other large lightweight high strength MDF door can be guaranteed like that, which also includes a full 50-year warranty on the structure of the door as well.

MDF Veneer Doors

Next up, MDF veneer doors. When you’re talking about a large-scale job incorporating veneer for that high-end client who demands the very best, Sing’s patented and patent-pending veneer substrate is the premier solution for the most exclusive clientele.

Veneer can be sliced very thin, and any imperfection in the material underneath the veneer can become exponentially more apparent on the finished surface area. To combat this problem, the best millworks and veneer shops crossband to create a more natural surface area resulting in less noticeable imperfections.

Using Sing’s MDF underlayment for veneer provides a flawlessly smooth surface area to apply even the thinnest veneer for that perfect finish. And size? Well, the biggest and best veneer jobs have fail-free high precision Sing Core inside, which also matches perfectly with Wood Stave Doors as well.


For the architect, artisan, designer, visionary artistic creations can be brought to life with Sing’s lightweight warp-free CNC MDF door substrates. Imagine having a high-precision lightweight door canvas that is fully insulated for sound deadening and climate control capabilities that can be CNC sculpted to your heart’s desire.

That’s like a dream come true as your dream door is manifested via the efforts of top craftspeople and CNC artisans with the help of Sing’s inventions and his True Flat Team, all working together to see your idea become a reality.

To bring such a work of art to life may not have been impossible in the past, but to have a lightweight high strength configuration that was fully insulated and fail-free for 50 years guaranteed? Now that is something previously unheard of.

CNC Carved MDF Doors

CNC carving is taking the place of hand-carved projects all around the world, saving time and money.

Note that 3D carving can impact the surface area enough to make it less than stable. Using patented and patent-pending Sing Core technology as underlayment can solve the issues of carved surfaces creating challenges over time, even if the surface material is one that tends to move according to changes in the environment, like natural and exotic woods, which can be added to MDF and Sing Core, not unlike natural wood veneer.