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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”).

Contact your door maintenance company and send them two photos.

c) [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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What to Expect from Sing Core

What can I expect to receive when I order Sing products?

Sing Core only ships authentic Sing products to millworks and door manufacturers. Why? Because Sing products are raw building materials in unfinished condition. You cannot order a completed Sing door from Sing Core. Even though we are renowned the world over for the best doors, our web site clearly states,

“We do not build doors,” we only supply the best millworks and door manufacturers with the best professional door slabs which can be guaranteed not to warp, bend, twist, or otherwise fail for 50 years.

See also, What We Do: http://singcore.com/education/what-we-do

Don’t you have a standard Sing door?

No. Every custom door we build is like a one-of-a-kind work of art, though we are able to build many of the same type/style/size of doors at the same time, which can reduce pricing if purchased in bulk.

Don’t you want to make Sing Core available to the world?

Yes, we do, but remember, Sing Core is shipped in an unfinished condition and therefor is not ready for public consumption. It would be similar to ordering a 20×40 concrete slab, then being upset when the concrete truck shows up because you wanted a completed slab, not wet concrete. (The contractor knows what’s going on, but it might be a shock to the contractor’s customer.)

Isn’t Sing Core available in retail locations, like Lowe’s?

Yes, and no. We only ship to locations which have a full millwork shop inside to adequately finish the Sing products for their clientele. If the retailer does not have a full millwork shop for finishing Sing products, we will not intentionally ship unfinished product to that location.

What if I’m a contractor and my client wants Sing Core?

No problem, we will ship directly to your millwork, or the finisher of your choice. Once the Sing products have been finished, they can be installed by your installers.

How does architectural specification affect our bid?

If you’re a contractor bidding on a project where Sing Core has been specified, note that your quote from Sing Core is for unfinished materials. For instance, if a 20 ft x 10 ft x 4 in pivot door with birch wood stave has been architecturally specified, you will only receive the unfinished door slab with the appropriate interior supports for the hardware specified. You will still need to have the slab finished and prepped for hardware by your millwork, you will also need to source and price hardware, and account for framing and installation to complete the job.

What if my warp-free products show up warped?

Professional millwork companies know it is common for panels to display some warp when unpacked due to being crated and transported. It is the nature of raw materials which are packed, and traverse varying climate conditions while being shipped. Acclimatization of Sing products (separating them, standing them on edge for 72 hours, and allowing them to acclimate to your climate will allow the products to return to their true flat condition).

What if my Sing products are defective?

In the event that your professional Sing panels are warped beyond AWI standards, or the architectural standards as notated by your work order, you may have a defective Sing panel. Working with our warranty department will help to determine if you have a defective sing panel. If so, Sing Core will fix, repair, or replace the defective panel to assure its architectural integrity.

Know What You’re Getting

We at Sing Core want you to know what you’re getting, wo that you can be prepared to enjoy the best Eco-friendly lightweight/high strength raw building material available and achieve its maximum potential and elegance.

For more information, see our Frequently Asked Questions: http://singcore.com/education/faq

Sing Core Definition of Terms: http://singcore.com/education/sing-core-definition-terms

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Basic Sing Door Spec Drawings

The following are standard drawings of doors which you can print and/or modify for marking up your specifications as an alternative to paying for professional shop drawings.

Hinged Door

Pivot Door

Sliding Door

Splined Door

Doors with Professional Sing Core inside are the only Eco-friendly doors that can be guaranteed to remain warp-free for 50 years, including full structure warranty.

Thank you for trusting Sing Core with all your lightweight high-strength door needs for any type or style of door in any size made of any flat building material.

 

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Sing Panels with Plumbing and Wire Chase

sing-panel-horizontal-embedded-cable-chase-wire-chase-plumbing-chaseCustom Sing Panels can be manufactured to your architectural specifications which may include special chases for plumbers to route hot and cold water feeds via plumbing or electricians to run electrical wiring, communications and security through a patented Sing panel.

Surface mount conduit and exterior chases can be added to Sing panels as they are, though many users of our patented insulation reinforced torsion box core prefer to use embedded wiring chase of for water supply pre-installed plumbing chase.

Embedded Chases

Embedded chases can be placed at specified locations prior to manufacturing your Sing panel to meet the specific requirement of the job at hand, accommodating communications center needs or the special needs of inplant offices, clean rooms, temporary warehousing, watch towers, guard shacks, portable classrooms, spa expansions, home theaters or any application where running utilities, like electricity, wiring and/or cables or plumbing inside and through your Sing panel may be advantageous.

Common horizontal chases are specified at 16 inches and 45 inches from the base, while the most common location for a vertical chase is in the center of the Sing panel. Regardless, every Sing panel is custom manufactured in our factory, and we can have your wire chase or plumbing pre-installed within your panels at any location specified.

How to Specify Wire Chase Locations

sing-panel-embedded-cable-chase-wire-chase-plumbing-chaseIt is easy to have your embedded chases pre-installed at the proper locations. All you have to do is to be certain to disclose the precise locations and sizes of your wire chase (plumbing chase or cable chase). We will provide you with an architectural drawing of your panel before your custom Sing panel is built for you to confirm the chase’s location.

No Loss of R Value

To preserve the R-value of your Sing panel it is advisable to have the cable chase filled with spray foam insulation after pulling the wires or routing the plumbing through the embedded channels. Likewise, if a channel is not used, it should also be filled with foam insulation prior to final assembly, unless insulation properties are not necessary for your application.

Panel Chase Options

Although many options abound for electricians and plumbers to install access to services, another popular method includes running cable, wire and plumbing through panel connectors that run the length of your standard Sing panels, or alternatively running services through the floor.

Many creative options are available for adding access to water, electricity and communications without having the necessity of pre-installed chases being embedded in your Sing panels.

Economy Chase Options

An emerging value-minded approach to inexpensive reinforced structural insulated panels is to obtain two economy 1.5 inch Sing Panels from your local Lowe’s Pro Desk. Prior to gluing them together to make a single 3 inch panel, simply router out where you want your chase channel to be, then adhere the two panels together. This is an inexpensive option discovered by price conscious tiny house builders.

 

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Large Cold Rolled Steel Pivot Door Specifications

General Specifications

 

Standard Sing Core Cold Rolled Steel Pivot Door Blanks 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 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 20 gauge cold rolled steel as exterior material (skin) according to your specifications.

Cold Rolled Steel Pivot Door Surface Material

The door blank surface material is made of 20 gauge cold rolled steel 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 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 standard Sing Core 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

 

Cold Rolled Steel Pivot Door Materials: Sing Core cold rolled steel 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
  • Core material is framed with solid wood stiles and rails
  • Facings are 20 gauge cold rolled steel
  • 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 cold rolled steel 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 cold rolled steel pivot door from factory to your location including proper crating to protect the natural beauty of your cold rolled steel doors during transport.

Storage and Protection: Store your Sing Core large cold rolled steel 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 cold rolled steel 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 cold rolled steel pivot doors are easy to work with in the metal shop for machining 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: Standard Sing Core 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 standard 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 pivot door blanks come with a 10-year warranty, while professional manufactured 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.

 

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Large Cold Rolled Steel Sliding Door Specifications

General Specifications

 

Standard Sing Core Cold Rolled Steel Sliding Door Blanks 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 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 sliding 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 20 gauge cold rolled steel as exterior material (skin) according to your specifications.

Cold Rolled Steel Sliding Door Surface Material

The door blank surface material is made of 20 gauge cold rolled steel 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 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 standard Sing Core sliding 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

 

Cold Rolled Steel Sliding Door Materials: Sing Core cold rolled steel 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
  • Core material is framed with solid wood stiles and rails
  • Facings are 20 gauge cold rolled steel
  • 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 cold rolled steel sliding 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 cold rolled steel sliding door from factory to your location including proper crating to protect the natural beauty of your cold rolled steel doors during transport.

Storage and Protection: Store your Sing Core large cold rolled steel sliding 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 cold rolled steel sliding 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 cold rolled steel sliding doors are easy to work with in the metal shop for machining 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: Standard Sing Core sliding door 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 standard sliding 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 sliding door blanks come with a 10-year warranty, while professional manufactured sliding door blanks can be structurally guaranteed and warp-free for 50 years under normal conditions.

Basic Sing Door Spec Drawings: Click here

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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.