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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 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.

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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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 3-0 x 7-0 Door Specs

General Specifications

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.

Detailed Specifications:

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.

 

Basic Sing Door Spec Drawings: Click here

See also: Door Technical Information

Appearing regularly in Contemporary Architecture Design

* 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.

 

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Door Finishes

There are many ways to build large doors with Sing Core inside, the only doors that can be,

Guaranteed Warp-free for 50 Years


When it comes to oversize doors, one door stands out above the rest for high-end applications; see comparison. Look for these features in your door for the most discriminating taste(s):

  • Available in any size (up to 16 ft.)
  • Lightweight
  • Strong (stronger than steel pound for pound)
  • Insulated
  • Sound-deadening
  • Guaranteed True Flat
  • Resistant to warp, twist, crack & rot
  • Standard 10-year warranty
  • Professional 50-year warp-free guarantee

For more detailed information on our doors, see our Architectural Specifications.

Though Sing Core Doors are available in nearly any wood species, our standard varieties include:

sing-maple sing-cherry sing-oak sing-vg-fir sing-walnut
MAPLE CHERRY OAK VG FIR WALNUT

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)
  • Wood plywood
  • MDO
  • HPL
  • 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.

oversize-panel-edge-glued-together-planks-5ftx10ft Sing-Hardwood-Panels-Variety

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.

Sing Hardwood ply door has excellent strength, yet is lightweight, features good insulation and better sound deadening qualities than solid wood plank doors.

 

variety-of-design-options-for-architectural-doors-illustration-sing-core

 

Applications -> Building Components -> Doors -> Door Finishes

 

 

 

Paint Grade Door

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What We Do

What We Do and What We Do Not Do

We get so many inquiries about people who want Sing Core, we thought it might be helpful to help you better find ways to get Sing Core into your hands. With that in mind, let us tell you a little more about what we do and what we don’t do.

The Only 50 Year Warp-free Guarantee and full structure warranty

What We Do

We do the job that no one else can do. We do not do the work that is better left to more qualified and skilled trade professionals. The reason our clients seek us out is to perform the parts of the job that would not be possible without the use of patented Sing Core. It is the unique combination of what we do best and what the experienced trade professionals do best that results in creating the best if the best, highest quality end products possible.

We have solved the age old problem of warping doors, high end large doors that are lightweight yet extremely strong with the best warranty in the high end door industry. This same invention helps other industries meet or exceed the high expectations or requirements of their most demanding clients.

Sing Core is a patented solid torsion box hybrid core that is lightweight and high strength. We have developed and manufacture this revolutionary building material here in our Pacific Northwest factory. Part of our manufacturing process includes laminating flat exterior surfaces, or skins, to our proprietary core. Our clients often trust our lamination expertise and request our adhering additional flat building materials to the faces and edges, though many of the manufacturers whom we supply apply their own materials to the surface areas of our Sing panel.

We do offer custom interior blocking inserts, custom channeling for utility and wire chases, as well as custom lite cutouts for glass installation per architectural specifications.

We build the biggest lightweight high-strength panels, which can be built as giant slabs (subject to transportation limitations), large oversized doors, or as modular components to be shipped to and assembled on site.

We build to architectural specification only. We only ship to millworks, door companies, custom door builders and manufacturers of almost anything from furniture to bridges and aircraft.

We do build high performance sustainable Sing products with the flattest, straightest, lightweight high-strength material available (Sing Core) with the highest tolerance (+/- .006 in.).

We do participate with architects and engineers on the specifications of products which are built for specific applications for a guaranteed life-span (i.e., 50-year warp-free guarantee) to make certain the Sing product meets or exceeds high performance expectations.

We manufacture all Sing products in our factory in McCleary, Washington, assuring every item is proudly made in the USA.

We ship Sing products directly from our factory to our customers in the United States all over the world.

What We Do Not Do

While we can do a great many things, we leave certain areas of expertise to the industry professionals whom we supply with patented Sing Core products. That said, we do not build any finished product. While we are renowned for the most magnificent large doors built, and the only Eco-friendly lightweight high strength doors in the world, we do not build doors. These luxurious doors are finished by find crafts people who have the highest level of skill and competence which makes our product so beautiful.

We do not do any finishing of any Sing product(s) or build any finished Sing products.

We do not engineer, certify or have any stamped or code-approved stock items. For instance, we do not sell fire-rated doors, even though we build doors to engineer approved fire-rated specifications, which are rated, approved and/or stamped, but this is done by the door companies or other clients.

Likewise, we do not build sound-rated doors, even though we have built doors to architectural specifications which are used and may be rated as acoustical doors and sound proof walls (we even have a local sound testing and rating laboratory nearby, which may be used at customer’s expense). We supply the best door panels for door manufacturers and millwork to meet their client’s demands such as fire rating, sound proof, even bullet proof, etc…

We do not install glass in Sing products, although we can custom pre-cut and/or frame for lite cutouts, which are ready for glass installation by the company responsible for finishing the product.

We do not have stock items, with very few exceptions (i.e., trade show panels) and we do not ship to residences unless it is a job site being managed by our wholesale-approved client.

We do not sell retail. We are licensed only for wholesale and do not ship Sing products to anyone who is not in the business and qualified to expertly finish and ensure proper installation of Sing products.

What We Love

We love helping our architecturally advanced clients enjoy the most prestigious, high end Eco-friendly lightweight high-strength insulated products, panels, posts and beams, and doors that can be guaranteed not to warp for 50 years.

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Sing Core Door Operation & Maintenance

Materials Overview

Sing Core manufactures door blanks made exclusively using patented Sing Core and patent-pending Sing warp-free stiffeners to create door blanks which are paint grade, or surfaced with any available flat surface building material, such as any available wood species, aluminum, brass, cold rolled steel, concrete, copper, diamond plate steel, fiberglass, FRP, galvanized steel, hot rolled steel, Kevlar, LVL, MDF, and stainless steel, just to name a few.

Receipt of Sing Door Blanks

In most cases, when receiving a multiple Sing Core order, where Sing door blanks have been shipped in a stack, or side by side, it is perfectly normal for even a warp-free door blank to appear to be warped upon receipt. Usually, the Sing door blank(s) which face the outside of the crate, or the top of a stack of warp-free door blanks will appear to be warped. By acclimatizing these doors, they will straighten out to their straight and true flat appearance.

Acclimatization

To acclimatize your Sing door core, stand your door on its edge at least twelve inches away from any adjoining surface area, allowing it to acclimate for up to 72 hours. Measure your door again and you will find it to be straight and true. If not, document for warp and contact Sing Core.

Storage

After you’ve received your patented Sing products, if you will have to store them prior to finishing and/or installation, try to store them standing upright, on end, with plenty of space in between. Do not lean them against a wall. If you must store them stacked, wrap in plastic and place one or two sheets of plywood underneath and on top of the stack of Sing products. This will help keep the entire stack similarly acclimatized while not in use, otherwise, you may have to re acclimatize the top and/or bottom Sing products later, when you are ready to use them.

Fabricating

Note: Use protective eyewear such as goggles or safety glasses, cover your nose and mouth with a filter mask when cutting Standard Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners Door Blanks. Always position the panel so the saw blades enter the exterior side first to avoid chipping and damage.
Any drilled holes or cut-outs must also be filled and sealed with an approved sealer to maintain the original panel warranty.

Finishing Sing Core Doors

With proper care and maintenance, professional grade doors created with Sing Core inside can be guaranteed not to warp, bend, twist, cup, or otherwise fail for 50 years.
Doors built with Sing Core inside are shipped to the millwork, door company, or custom door manufacturer unfinished. Finishing of the door should be completed directly following the receipt of the door blank to protect your investment.

Proper finishing is required to ensure the warrantied condition of a door with Sing Core inside. Please note that if a failure to finish your Sing product in a timely manner contributes to a defect, the defect would not be covered under the warranty — and the Sing Core warranty does not cover issues associated with improper finishing. Please refer to the warranty.
Sing Core is recognized as the leader in high quality Eco-friendly door manufacturing. However, finishing of Sing Doors is the responsibility of the experts entrusted with completing the details of door blanks provided.

The local finisher will coordinate with Sing Core to assure your door is finished properly in regard to finishing options to assure your door will perform best in your regional location taking into consideration exposure to the elements, changes of seasons, temperature and humidity.

Finishers will follow the manufacturer’s instructions regarding application, storage and disposal of finishing products.

Maintenance

A minimum requirement to assure the long-term performance of your Sing product annual inspections of the door must be conducted to ensure the warrantability of your Sing door. Annual cleaning, repainting, or restaining your Sing door as needed will ensure the performance of your Sing door over time.

Annual inspection includes checking for corrosion, peeling, or cracks on the door’s surface. Problem areas must be touched up as soon as possible to prevent further compromise or damage.

Any sealant material should not be cracked, broken, or missing. Any damage to the Sing door or structure due to improper or insufficient maintenance is not covered by Sing Core’s warranty.

Warranty

Sing Core professional manufactured doors are structurally guaranteed and warp-free for 50 years under normal conditions. See guarantee/warranty which accompanies your professional Sing product.

Sing Core – P.O. Box 1691 – McCleary, Washington 98557 – USA – (360) 495-3577 – www.singcore.com

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Product Data Sheet Sing Core Insulated Reinforced Torsion Box Sliding Door Blank with Stiffeners

Product Data Sheet

Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners

The standard Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners consists of base core material of patented Sing Core, enhanced with patent-pending stiffening technology sandwiched between two exterior faces. Standard facing material is Birch ply. Sliding door blank is framed with 1.25-inch natural wood for finishing strength and attaching hardware.

 

Condition of standard Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners is unfinished. Finishing to be completed by professional door manufacturer, millwork, or custom door builder.

Most common size is 10 ft. tall, 5 ft. wide, 1.75 inch thick. Custom sizes and alternate external faces are routinely ordered and manufactured on an “as specified” basis with minimum quantities and extended lead times.

The standard Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners is the most reliable, well-tested, and only door blank that can be guaranteed for longevity and warp-free performance for 50 years.

In the event of door damage, repairs to the standard Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners can be made on site without compromising the structural integrity of the door.

Table 1 – Physical Properties – Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners

 

Item

Nominal Thickness

Nominal Panel Weight

Exterior Faces

Sizes

Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners 1.75-inches

Other Thickness as Specified

2-3 LBS PSF Birch Ply Skins

Alternate Materials Available as Specified

120″ x 60″ x 1.75″

Custom Sizes Available per Specifications

Typical Applications

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

Features

Smooth Birch ply surface is paint grade (not paint ready) and can be used to apply additional surface materials using cold-press or vacuum press methods by the finishers, millworks, or custom door manufacturers. Alternatively, Sing Core can apply additional surface materials to specifications.
Standard Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners is not recommended for hot press treatment. If intended for hot press, please order hot-press-ready Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners.
Process of adding additional materials must be approved by Sing Core true flat team to assure the application of additional exterior facings will not void the warranty.
Standard Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners has the world’s best strength to weight ratio of any sustainable dimensionally stable building material.

Storage and Protection

Store your Sing Core door in an upright position and allow to acclimate to room temperature following shipment receipt or prior to finishing or installation.

Handling

All Sing products are shipped as unfinished to the millworks and door companies who are highly proficient in working with high-end materials such as Sing Core.
Sing Core works in tandem with the industry professionals and the factory may, or may not, handle some of the detail work, such as applying exterior skins to the door blank.
The door finishing, hardware, framing, and installation are all coordinated before your Sing door blank is built.

Fabricating

Note: Use protective eyewear such as goggles or safety glasses, cover your nose and mouth with a filter mask when cutting Standard Sing Core Insulated Reinforced Torsion Box Sliding Door Blank w/Stiffeners Door Blanks. Always position the panel so the saw blades enter the exterior side first to avoid chipping and damage.
Any drilled holes or cut-outs must also be filled and sealed with an approved sealer to maintain the original panel warranty.

Sing Core Tolerances

Thickness: + or .006 in.
Width: Plus 0 in, Minus 0.0156 in.
Length: Plus 0 in., Minus 0.0156 in.
Square: + or – 0.0156 in.

Warranty

Sing Core professional manufactured doors are structurally guaranteed and warp-free for 50 years under normal conditions.

See also: What to Expect from Sing Core

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Sing Door Ship Receive Warp-free Care

Shipping, Receiving, and Care of

Your Warp-free Sing Door

Sing Core only works with the best and most highly proficient millworks and door manufacturers. This segment of the industry is well-versed in how to deal with high-end building materials such as Sing Core. For many years, Sing Core has provided unfailing warp-free solutions to the biggest and best architects and millworks in the world, without one complaint.

As more millworks and smaller door companies are reaching out to offer their clients access to Sing Core, we do occasionally run across industry professionals who are not aware about what to expect or how to handle Sing Core raw materials. Some of these less-experienced, newer and/or smaller millworks and door companies may not know what to expect when dealing with a product like patented Sing Core. We desire to welcome newcomers to have access to patented Sing products. For those, we are providing the following information:

Unfinished

All Sing products are shipped as unfinished to the millworks and door companies who are highly proficient in working with high-end materials such as Sing Core. A Sing door blank is not a ready-to-install door and are not available from the factory with hardware or as pre-hung doors. Sing Core works in tandem with the industry professionals and the factory may, or may not, handle some of the detail works, such as applying exterior skins to the door blank. The door finishing, hardware, framing, and installation are all coordinated before your Sing door blank is built.

Packaging and Shipping

Sing products tend to be very large in size and require custom crating to assure they are not damaged in shipment to the industry professionals. Even with the best efforts of Sing Core’s custom crating team, sometimes a Sing product may arrive blemished and/or damaged by the shippers entrusted with the handling of crated Sing materials. In most, if not all, cases the level of structural integrity of Sing products in combination with the high level of proficiency of the finishers receiving Sing products, even damaged Sing Core can easily be returned to new condition, even if mishandled or damaged in shipment.

Arrival of Sing Products

Upon arrival of Sing products, be prepared to receive an unfinished product via truck. Offloading may require a forklift and dock for receipt. That said, there will be work that needs to be done to the product received by the millwork or door company before it is retail-ready.

Acclimatization

In most cases, when receiving a multiple Sing Core order, where Sing door blanks have been shipped in a stack, or side by side, it is perfectly normal for even a warp-free door blank to appear to be warped upon receipt. Usually, the Sing door blank(s) which face the outside of the crate, or the top of a stack of warp-free door blanks will appear to be warped. By acclimatizing these doors, they will straighten out to their straight and true flat appearance.

To acclimatize your Sing door core, stand your door on its edge at least twelve inches away from any adjoining surface area, allowing it to acclimate for up to 72 hours. Measure your door again and you will find it to be straight and true. If not, document for warp and contact Sing Core.

Storage

After you’ve received your patented Sing products, in the event that you will have to store them prior to finishing and/or installation, try to store them standing upright, on end, with plenty of space in between. Do not lean Sing products against a wall. If you have to store them stacked, wrap in plastic and place one or two sheets of plywood underneath and on top of the stack of Sing products. This will help keep the entire stack similarly acclimatized while not in use, otherwise, you may have to re acclimatize the top and/or bottom Sing products later, when you are ready to use them.

Door Warp Definition

Door warp is a variation from a plane surface within the door itself. It does not refer to the door in relation to the frame or jamb in which it was hung. Bow, cup, and twist are terms which describe warp in a door and are defined as follows: Bow is a curvature along the door height, or a deviation from a flat plane from end to end. Cup is a curvature across the door width or a deviation from a flat plane from side to side. Twist is a distortion in which one corner is out of the plane of the other three corners. Warp is usually a result of unequal stresses within the door from one face to the other caused by changes in humidity and temperature conditions or uneven conditions from one face to the other. Buildings shall be humidity and temperature controlled before doors are delivered and installed. Required conditions are 25% to 55% relative humidity and 50° to 90° F (10° to 32° C) temperature range. Improper handling, stacking, and storage can also contribute to warp. Doors shall be stored flat on a level surface off the floor with cross supports.

HOW TO MEASURE WARP

Use a taut string or straight-edge and measure on the concave face of door – diagonally, horizontally, or vertically. Measure at the point of maximum distance between the taut string or straight-edge and the face of the door.

Measurement must be made on the concave face of the door. Door shall be open when measuring for warp (lock not latched into strike). One person can measure warp using a string and taping one or both ends onto the face of the door, holding it taut. Don’t measure warp in relationship to the door frame. Often a door may not fit into the frame properly but is not warped. In these cases, check the frame – it must be set plumb and square and jambs must not be twisted or out of alignment. Action on any claim for warp may be deferred for up to one year after project completion to permit doors to acclimate to temperature and humidity conditions.

 

ALLOWABLE WARP TOLERANCE
FOR WOOD DOORS

1-3/4 inch (44 mm) or thicker doors:

  • 3’-6” x 7’-0” (1050 mm x 2100 mm) or smaller, 1/4 inch (6.4 mm) maximum.
  • Larger than 3’-6” x 7’-0” (1050 mm x 2100 mm), 1/4 inch (6.4 mm) maximum in any 3’-6” x 7’-0” (1050 mm x 2100 mm) section.

1-3/8 inch (35 mm) doors:

  • 3’-0” x 7’-0” (900 mm x 2100 mm) or smaller, 1/4 inch (6.4 mm) maximum.
  • Larger sizes not addressed in this standard

Warp-free definition: Doors with patented professional SingCore inside outperform any other Eco-friendly door in the world in terms of being lightweight (SingCore weight is approximately 10 % of solid wood, timber or plywood core) and high strength (660 PSI+, stronger than steel pound-for-pound). No other door Eco-friendly door made in the USA can reach our high precision (SingCore approximately +/- .006 inch) or flatness meets or exceeds door industry allowance for door warp, as seen above). We guarantee no other Eco-friendly, lightweight, high-strength insulated door can compare with any door that has patented professional Sing Core inside. SingCore is raising the standard of what is possible in terms of building large doors that can be true flat and warp-free.

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.

See Also: Sing Core Definition of Terms

 

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Large Trapezoid Pivot Door 40 ft. Tall

General Specifications

Sing Core Professional Large Trapezoid Pivot Door Blanks are 40 ft. tall,18 ft. wide at the top 12 ft. wide at the bottom, and 3.5 in. thick and manufactured utilizing patented Sing Core material as the base interior substrate of the door. Size to be adjusted to varying specifications. 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 foam material is available in various forms depending on your specification. The default is recycled EPS foam. Natural wood lock blocks can be positioned at locations as necessary for locking mechanism placement and/or as pivot hardware anchor points. The core material is framed by 1.25-inch wood stiles and rails for finishing strength and attaching hardware. The torsion box is completed by adhering .25 in. marine grade birch paint grade ply as exterior material (skin) or other material according to your specifications.

1/4 in. Marine Grade Birch Ply Pivot Door Stress Skin

The trapezoid pivot door blank surface material is made of .25″ marine grade birch ply paint grade stress skin unless otherwise specified. Bonding agent used in adhesion of the entire composite material is formaldehyde-free.

Click here for tips on How to Create the Right Sing Panel for your specific project.

Every Sing Core manufactured trapezoid pivot door blank is unfinished (unless specified otherwise) and professional grade is guaranteed for 50 years for warp-free and structural integrity.

Detailed Specifications:

Scope: Subject to local building codes, the Sing Core trapezoid pivot door blank 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

 

Large Trapezoid Pivot Door Materials: Sing Core large trapezoid pivot door blanks are manufactured using Eco-friendly cold-press process. Composite materials include:

  • Sing Core vertical wood-grain torsion substrate filled with recycled EPS foam
  • Professional grad composite stiffeners are included for long lasting warp-free performance
  • Core material is framed with solid wood stiles and rails
  • Stress skins are .25 in. marine grade paint grade birch ply
  • Formaldehyde-free bonding agent is used for adhesion of all components

Architectural Specifications Substitutes

For information on some of our architectural substitutes click here.

Interior Blocking: Solid wood implants can be inserted as lock blocks or anchor points. Also additional stiles (vertical wood implants) or rails (horizontal wood implants) can be positioned at any desired location inside the large trapezoid pivot door. (Note: Depending on your expectations, solid wood implants should be supported by at least 12 inches of Sing Core material to maintain true flatness.)

Delivery: Reasonable care is taken to ensure safe transportation of your Sing Core large trapezoid pivot door from factory to your location including proper crating to protect the natural beauty of your pivot doors during transport.

Storage and Protection: Store your Sing Core large trapezoid pivot doors 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 openings or attachment walls 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 attachment, hinging and latching assemblies operate freely and correctly

Finishing: The finishing of the Sing Core large trapezoid pivot doors are the responsibility of the client due to the product being delivered in unfinished condition unless specified otherwise in writing for use in interior applications only. Any exterior use must be approved in advance to avoid warranty exception and sealing must be in accordance with manufacturer’s specifications to protect against a variety of environmental conditions as necessary. In reference to exterior applications:

  • Seal all 6 surfaces with two coat minimum on operable panel(s)
  • Finishing or re-finishing must be completed following acclimatization and installed within 7 days
  • Avoid finishing after rain (or damp) or during periods of higher than average humidity
  • At least once a year, conduct periodic inspections of coating to ensure no wall panel components are exposed
  • Reseal the surface as necessary

Machining: Sing Core large trapezoid pivot doors are easy to work with in the millwork or standard woodworking shop for CNC work or on-site for finishing, and fastening.

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: Sing Core large trapezoid door pivot blanks feature built-in insulation value with an R3 (can be upgraded to to R6.5 or more) rating per inch, depending on architect’s specifications.

Acoustical Performance: Sing Core trapezoid pivot door blanks have a natural sound-deadening quality for noise control. Standard sound transmission class (STC) is 30*. Additional noise control specifications can be met at the behest of the customer or designer and must be noted in advance.

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 wood fiber and/or recycled material.

Warranty: Sing Core professional large trapezoid pivot door blanks can be structurally guaranteed and warp-free for 50 years under normal conditions.

Basic Sing Door Spec Drawings: Click here

variety-of-design-options-for-architectural-doors-illistration-sing-core
Custom-cut Window/Lite Openings: Lite openings for glass inserts can be custom cut per your specifications (drawings above show examples of standard openings) for glass insertion.

Door Specifications

Door Width
Rough Opening Width
Rough Opening Height 6/8
2/0 (Single) 26″ 82-1/2″
2/4 (Single) 30″ 82-1/2″
2/6 (Single) 32″ 82-1/2″
2/8 (Single) 34″ 82-1/2″
3/0 (Single) 38″ 82-1/2″
4/0 (Double) *50″ 82-1/2″
4/8 (Double) *58″ 82-1/2″
5/0 (Double) *62″ 82-1/2″
5/4 (Double) *66″ 82-1/2″
6/0 (Doulble) *74″ 82-1/2″

See also: Door Technical Information

Appearing regularly in Contemporary Architecture Design

* 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.