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.
Forget 15 Piece Stile and Rail
insulated, high strength, lightweight Sing honeycomb door
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.
Insulated Walnut Door
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.
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.
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.
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.
Accurate Panel Insure Tight Fit Bi Fold Doors
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.
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 Door Panels Flat
It is very important that all panels are laid flat on the ground and are completely level. Attempting to glue the pieces up against a wall or other than completely flat may result in 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. Slide a Spline in to One Side
Each spline and pocket are precisely cut to fit with strength. Our products are built with our warp-free guarantee in mind. Simply push or lightly hammer the spline in place on one side of the joint. Then your panels are ready to be fit together.
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 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.
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.
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.
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.
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)  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  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.
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.
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.
Standard Sing Core 3 0 7 0 doors are manufactured with patented Sing Core material as the base interior substrate of the door. The Sing Core substrate material is created using a vertical grain natural wood torsion box design while the traditionally empty voids are filled wall to wall with recycled foam. The standard foam material is recycled rigid EPS foam. A 10-inch natural wood lock block is positioned centered at 37 inches for door knob and locking mechanism placement on both sides of the door. The core material is wood framed by 2-inch natural wood for finishing strength and attaching hardware. The torsion box is completed by adhering an exterior surface material (skin) in your choice of paint grade (Birch ply), wood veneer(s), or natural wood stave. Bonding agent used in adhesion of the entire composite material is formaldehyde-free.
Standard Sing Core 3 0 7 0 Doors include frame perfectly suited for the door of your choice and ready to hang. Specify either 2×4 or 2×6 wall thickness to determine frame size for door installation (not supplied by Sing Core).
Every Sing Core manufactured door is finished to specifications and guaranteed for 5 years for structural integrity.
Scope: Subject to local building codes, the standard Sing Core door is intended for use in:
Single family dwelling interior applications
Multifamily dwelling, low-rise professional office, library and low-rise motel interior applications
Lighter use industrial building and factory, hotel and retail sales building interior applications
Product Description: Standard 3 0 7 0 door panel manufactured by Sing Core available in 1 3/8” or 1 3/4″ thickness is designed for side-hinges (not supplied).
Door component includes paint-grade door panel, wood veneer, or wood stave for 2×4 or 2×6 wall installation
Door Panel Materials: Sing Core standard 3 0 7 0 doors are manufactured using Eco-friendly cold-press process. Composite materials include:
Sing Core vertical wood-grain torsion substrate filled with recycled EPS foam
Core material is framed with 2-inch wood stiles and rails
Facings are your choice of paint grade (Birch ply), wood veneer, or natural wood stave
Formaldehyde-free bonding agent is used for adhesion of all components
Interior Door: Features R 3.5 per in. insulation, available in 1 3/8″ or 1 3/4″ door thickness.
Exterior Door: Features R 6.5 per in. insulation, available in 1 3/4″ door thickness only
Interior Blocking: Solid wood implant is inserted for door knob and/lock block hard points on both sides of door.
Delivery: Reasonable care is taken to ensure safe transportation of your Sing Core 3 0 7 0 door from factory to door shop for finishing and pick-up or deliver to your location.
Storage and Protection: Store your Sing Core standard 3 0 7 0 door in an upright position and allow to acclimate to room temperature following shipment receipt or prior to finishing or installation.
Preparation: Per manufacturer’s specifications, ensure that door frame openings are constructed plumb, true and level prior to installation. Select fasteners of adequate type, number and quality to assure proper function.
Installation: Installer shall be specialized in the installation of the type of work that is associated with the project and will comply with manufacturer’s installation policies and procedures to ensure proper end use.
Verify that hinging and latching assemblies operate freely and correctly
Finishing: The standard finishing and sealing of the Sing Core standard 3 0 7 0 door includes paint grade (Birch ply), wood veneer, or unfinished natural wood stave. Additional finishing options include your specifications at additional charge.
Machining: Sing Core standard 3 0 7 0 doors are easy to work with in the millwork shop for CNC machining or on-site for finishing, sawing, sanding, cutting and fastening. No specialized skills or equipment is necessary, other than standard woodworking tools are necessary. Treat Sing Core doors just like you would any other standard wooden door blank.
Strength Performance: Patented Sing Core has an unsurpassed strength as compared to other lightweight substrate materials tested at 660 PSI (based on 2″ x 2″ grids and 3/4″ thick) for superior structural integrity and is resistant to warp, twist and crack when compared to other materials.
Light Weight Performance: Sing Core weighs much less than other traditional building materials, as much as 50% less; or more, as little as 4 lbs. per sq. ft. yet sustainable and true green technology.
Insulation Performance: Standard Sing Core 3 0 7 0 doors feature built-in insulation value with an R3 rating per inch.
Acoustical Performance: Sing Core standard 3 0 7 0 doors have a natural sound-deadening quality for noise control. Standard sound transmission class (STC) is 30.
Eco-friendly: Sing Core is manufactured using natural wood fibers, no formaldehyde, or toxic chemicals, is created using less energy than any other core material with little or no waste. The structure of Sing Core is 100% renewable (nature-grown) clean fiber and/or recycled material.
Warranty: Sing Core manufactured doors are structurally guaranteed for 10 years under normal conditions.
* Note: STC rating varies according to size, thickness, skin, and other factors. Sing Core does not rate doors, although we are fortunate enough to have one of the best sound testing labs in the world, here in the Pacific Northwest. If you require a specific STC rating, Sing Core can build a door to your architectural specifications and have the resulting door tested at our rating facility for an official rating.
Note: This is an archived page and is no longer available. For current information visit us online at: singcore.com
Sing Core has a long history of solving the most challenging obstacles in thermally insulated doors made of any flat material that can be guaranteed true flat and stay flat for 50 years. Our doors are highly unique one-of-a-kind solutions that are used in the most exclusive (and expensive) structures around the world.
That is, until now. There has been an sharp increase in the demand for standard Sing doors that could be used in more traditional residential applications at a price that is in-line with other quality doors that are commercially available to the public but do not have all the characteristics that are unique to Sing doors.
Introducing Standard 3 0 7 0 Sing Doors
Sing Core is raising the standard of all doors by offering Sing Standard Doors that are available from any door company or lumber supply. For virtually unlimited door options, see even More Doors.
Even though Sing Standard 3 0 7 0 Doors may look like other doors (because we can duplicate the look and feel of any door style) looks are only skin deep. The real difference between Sing doors and any other commercially available lies deep beneath the skin in the heart of the door itself. The core value of Sing door core imbues the door with a set of unique characteristics that cannot be found in any other types of doors.
3-0 x 7-0 Flush Door
Our standard 3-0 x 7-0 doors are framed for hanging by the door company or millwork you choose.
For instance only Eco-friendly insulated Sing 3 0 7 0 doors are lightweight, high-strength, sound deadening and can feature any exterior material surface or look and appearance. Sing doors are the only doors that use a high-precision core (within .006 inch) that can be guaranteed to be true flat and stay flat, not to warp, rot, bend, twist or otherwise fail for 50 years.
Standard Door Sizes
Your standard 3 0 7 0 door is available in your choice of standard thicknesses:
All three standard door styles and sizes (above) are available in your choice of three surface material types, paint grade, veneer, and natural wood stave, to better suit your application(s).
Standard doors are available in
Paint Grade (Birch ply)
Natural Wood Stave (check for availability)
Standard 3 0 7 0 Doors
All standard 3 0 7 0 doors are provided as door slabs only. Standard lock blocks are installed on both sides of door. No hardware, such as hinges or doorknob is included. Standard 3 0 7 0 doors are not available pre-hung from Sing Core. See your door company, finishing, adding hardware, and hanging door is the responsibility of the door company or millwork.
Interior doors available in 1 3/8″ or 1 3/4″ thickness w/R 3.5 per in. insulation. Exterior doors available in 1 3/4″ only w/R 6.5 in. insulation. Prices do not include shipping, handling, or crate.
One Price Fits All
Sing Standard Doors are all the same price. Choose from Birch, Oak, or Mahogany veneer doors; all the same price. Also select your choice of standard 1 3/8″ or 1 3/4″ thick door (for even more strength and insulation) at no extra cost.
Enjoy getting the lowest prices on the best standard 30 70 doors available by participating in our special get acquainted offer. You can have our standard 3 0 7 0 door ready to pick up at your favorite door company or millwork and have the same Eco-friendly high quality doors that out-perform any other insulated doors in terms of lightweight and high strength.
Where to get Standard 3 0 7 0 Sing Doors: From your local sellers of doors or any of your favorite front door manufacturers.
Standard lite cutouts available (1 style cut-out per block. 10 piece minimum). Choose from style number 1-8.
Submit Form for Introductory Discount Price
Submit the following form to receive your special discount wholesale price on Standard 3 0 7 0 Sing Doors and pass the savings onto your customers.
Custom Standard Doors
For an additional charge, Sing Standard Doors can be customized to meet your specifications. As a custom order, you may specify any door type, light cut out / window openings, dimensions, characteristics, composites or door surface material.
Custom Sing Doors are available in any size – even large oversized doors – and Premium Sing Doors can be true flat and guaranteed to remain true flat, not to warp, bend, twist, cup or otherwise fail for 50 years.
For pricing on Sing custom doors, see: Pricing for more information.
Though Sing Core Doors are available in nearly any wood species, our standard varieties include:
Note: Door designs can be modified to meet your specifications and requirements an may include the application and bonding of any flat building material. Please feel free to inquire for more information.
1. Paint Grade Door
2. Wood Grain and Wood Stave Door
3. Hardwood Plywood Door
1 Paint Grade Door
Our most popular door blanks are paint grade, and can be made to your specs including surface materials of,
Birch ply (most common)
Other material, as specified
2 Wood Grain and Wood Stave Door
Besides paint grade for the surface, we also provide solid wood stave laminate on both sides of the sliding door. Wood stave is easy to work with and will last. Your Sing wood stave door will be more high precision than solid wood door (less warping, and twist and crack) due to Sing Core’s extremely high tolerance (+/- .006 inch) and, rigidity and high strength (660+ PSI) and professional grade wood grain and wood stave doors are certified and guaranteed not to warp, bend, twist, or otherwise fail for 50 years.
Sing Core provides hot-press ready door blanks to door manufacturers who add wood veneer on both sides of Sing door blanks which are made of Luan skin or marine grade plywood sandwich with patented Sing Core in the middle, solid wood around 4 edges and wood block implants where needed for hardware.
Note: Veneer has to be handled very carefully every step of the way during production (we prefer to let the millworks handle this delicate procedure) and it is easy to damage by users over the years (but wood stave can be easily sanded and repaired).
We offer a very good price for wood stave doors, the cost is not much more than wood veneer doors.
3 Hardwood Plywood Door
We could make door with hardwood plywood as an effective way to make super large doors that you can stain any color. Up to 4×8 doors have no seam, but by orienting the grain horizontally, you can achieve a nearly seamless presentation on really big doors or extraordinary size.
Available in any available wood species, most common are Sapele, Oak, and Maple ply.
Marine Grade Ply
Sing Hardwood ply door has excellent strength, yet is lightweight, features good insulation and better sound deadening qualities than solid wood plank doors.