Education

General Specifications

Professional Sing Core doors are manufactured with patented Sing Core material as the base interior substrate of the door with patent pending composite stiffeners to strengthen and prevent door warping over time. 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 urethane foam insulation, stiffeners are added to support the performance of the door for specific end use application(s). Other foam insulation material is available in various forms depending on your specification. This default on this professional maple ply door is urethane foam. Natural wood lock blocks are positioned at locations as necessary for locking mechanism placement or as anchor points. The core material is wood framed by 1 1/4-inch natural wood for finishing strength and attaching hardware. The torsion box is completed by adhering an exterior material (skin) according to your specifications. The default on this professional series is a wood-grain maple ply material. 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.

This professional Sing Core manufactured door is unfinished (unless specified otherwise) and is guaranteed for 50 years for warp-free performance and 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: 2.5-inch sliding door panel manufactured by Sing Core

• Door component includes unfinished door panel only

Door Panel Materials: Sing Core doors are manufactured using Eco-friendly cold-press process. Composite materials include:

• Sing Core vertical wood-grain torsion substrate filled with urethane foam and stiffeners to spec
• Core material is framed with wood stiles and rails
• Facings are maple 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 are 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 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 door from factory to your location including proper crating to protect the natural beauty of your door during transport.

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.

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 sliding hardware and latching assemblies operate freely and correctly

Finishing: The finishing of the Sing Core professional sliding door is the responsibility of the client due to the product being delivered in unfinished quality unless specified otherwise in writing. Any sealing must be in accordance with manufacturer’s specifications to protect against a variety of environmental conditions as necessary.

• Edge-band edges to encapsulate Sing Core (see T-molding)
• 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 door components are exposed
• Reseal the surface as necessary

Machining: Sing Core 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. Treat Sing Core doors just like you would any other standard 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 professional doors feature built-in urethane insulation value with of R6.5 rating per inch, or more, depending on architect’s specifications and the utilization of other rigid insulation material(s).

Acoustical Performance: Sing Core standard doors 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 fiber and/or recycled material.

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

Basic Sing Door Spec Drawings: Click here

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.

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.

General Specifications

Standard Sing Core Hot Rolled Steel Wall Panels are manufactured with patented Sing Core material as the base interior substrate of the wall panel. 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 or as anchor points. The core material is framed by 1-inch T-slot stiles and 1-inch natural rails wood for finishing strength and attaching hardware. The torsion box is completed by adhering 16 gauge hot rolled steel as exterior material (skin) according to your specifications.

Wall Panel Surface Material

The wall panel surface material is made of 16 gauge hot 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 wall panel is unfinished (unless specified otherwise) and is guaranteed for 10 years for structural integrity.

Detailed Specifications:

Scope: Subject to local building codes, the standard Sing Core wall panel is intended for use in:

• Lighter use industrial building and factory, hotel and retail sales building interior applications

Product Description: 1.132-inch hot rolled steel wall panel manufactured by Sing Core

• Wall component includes unfinished wall panel only

Wall Panel Materials: Sing Core wall panels 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 T-slot stiles and wood rails
• Facings are 16 gauge hot rolled steel
• Formaldehyde-free bonding agent is used for adhesion of all components

T-slot Stiles

T-slot consists of an extruded aluminum square T-slot profile with four open T-slots, one on each face. The profile has align-a-grooves to assist in aligning connecting profiles. The profile is compatible with 10-series T-slot fasteners. The four open T-slots enable access from any direction and are useful for joining hot rolled steel wall panels securely and accurately.

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 (T-slot or vertical wood implants) or rails (horizontal wood implants) can be positioned at any desired location inside the wall panel. (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 wall panels from factory to your location including proper crating to protect the natural beauty of your wall panels during transport.

Storage and Protection: Store your Sing Core hot rolled steel wall panels in an upright position and allowed 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 standard hot rolled steel wall panels is the responsibility of the client due to the product being delivered in unfinished condition unless specified otherwise in writing fro 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 hot rolled steel panels 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 wall panels 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 wall panels 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 fiber and/or recycled material.

Warranty: Sing Core standard wall panels are come with a 10-year warranty, while professional manufactured wall panels can be structurally guaranteed and warp-free for 50 years under normal conditions.

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.

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.

FAQ

What Are Sing Panels?

In the aircraft industry, they call it honeycomb. In the woodworking industry, it is called a torsion box.  In the home industry, it is known as a sandwich panel.  No matter what you call it, Sing Core’s honeycomb panels have the strongest, most lightweight earth friendly core to structure your Sing Core panels.  Sing Core panels has more applications than any known material; use it for home construction, boat building, private jet furniture, home furniture, museum and trade show display, and doors.  Patented Sing Core panels are a hybrid of torsion box, sandwich, and honeycomb panel.  It has the flatness of a torsion box, the strength of a honeycomb panel, and the light weight of a sandwich panel.  Sing Core panels combine all of these characteristics to form the most earth friendly panel in the industry.

How Do I Order Sing Panels?

If you are an architect, wholesale supplier, millwork, or other trade professional, submit a price quote from our pricing page.

Dear Homeowner/DIY’er, unfortunately we do not sell to individuals, only to the building trades and commercial/wholesale companies.  Please contact your local millwork and request that they order your panels for you.  We will then work with them to utilize Sing Core for your project.

How to Handle and Deal with Sing Products

Our best long-standing clients know how to best handle and deal with Sing Core products due to their high level of expertise.  We welcome new clients to enjoy the benefits of patented Sing Core products.  If you are a potential new user of Sing Core you are advised to make yourself aware of how to handle and deal with Sing Core products before ordering any patented Sing product(s).

Can I Get a Discount?

You may be able to get a special discount in exchange for professional photographs of your project.  You can ask at the time you place your order, if you might like to participate in our photo marketing agreement.  You will pay the price on your invoice and receive a check from Sing Core as a rebate in the amount noted on your invoice following the receipt and approval of your photos.

How do I fasten to your panels?

Our panels have a solid wood frame and block inserts can be implanted inside the panel to create secure anchoring points. Anchoring points can be used for placing hardware, overlays, and even fastening the panel.
Stiffeners can be implanted to ensure a true-flat panel. The necessity for stiffeners depends on the overall size of the panel, application, and weight.
For more information, see our custom blocking page.

What are your skin options?

Skin choice is one of the biggest factors to avoid warping.
It is important to choose a skin that is non-permeable. Permeable skins allow moisture to be trapped in the skin material causing it to swell. This can cause structural issues over time.
Wooden doors have the most problems with moisture absorption.
It is important to specify exterior grade when needed for your application.
Skin choice can affect sound deadening capabilities and is important for adhering to a certain Sound Transmission Class (STC) rating.

Can I have dissimilar skins on my panel?

Dissimilar skins may be possible depending on your panel’s thickness. Please discuss this with your sales representative for more information.

Do I need to calibrate my panels before veneering?

Yes.

How do you handle such large doors?

Oversized panels are panels with dimensions over 4’ x 8’.
Oversize panels are often more difficult to handle and more costly to ship.
Luckily, we have devised a method to overcome this. The Sing Spline allows us to ship oversized panels in modular sections that can be joined at the work site. See Sing Spline for more information.
Almost any door can be made with Sing Core. Stile and rail style doors can be made by simply adding trim or molding pieces; however it will be much stronger than a traditional stile and rail door.

What is True Flat?

All Sing Core products are guaranteed true flat; that is to say that they far exceed AWI industry standards or ¼ inch deflection to be considered flat.  Specific degrees of flatness can be achieved and guaranteed based on your requirements, specifications and application.  See What is True Flat? for more information.

What is the difference between your core and your Sing Core panels?

What edging options does Sing Core provide?

Sing Panels can feature a 1.25 inch solid wood edging.  Other sizes are available as custom options as well.  Edge-banding is available at an extra charge.  Sing Core panels can also be purchased without an edge.

Why Do Sing Core panels have such a long lifespan?

Patented Sing Core panels use zero formaldehyde structural glue to bond Sing Core and the surface material creating the strongest lightweight eco-friendly sandwich panel/honeycomb panel, see comparison.  The patented Sing Core panel is nearly unbreakable due to being so lightweight and strong.  Even if damaged by rough handling, Sing Core panels can be repaired to their original strength (Our patented structural core and stress skins are much easier to repair than solid wood, MDF or plywood).

What is the weight of your panels?

The weight of our panels are based on many factors, W x H x T, the types and thickness of the skins chosen and of course the solid wood edging as well.  But for a rough ballpark estimate the weight of one of our standard panels 4’ x 8’ x 1” (finished size = 47” x 95” x1”) is somewhere in the 25 to 30 lbs range depending on the skin, which is much lighter than standard plywood of the same size/thickness.

What are the lead times for new orders?

Lead time for new orders is 6-10 weeks. Every order Sing Core manufactures is custom made, so please keep that in mind in regards to your project’s timelines.

If you require a rush order, rush fees are as follows:

Ship in 4 weeks – 20% price increase
Ship in 3 weeks – 40% price increase
Ship in 2 weeks – 70% price increase
Ship in 1 Week – 100% price increase

Rush fee times are counted beginning the day you approve the shop drawings for your project.

Exactly how strong are your panels?

The strength of our panels depends on factors like span, thickness, and skin type.  They have been independently tested by the University of Washington to exceed 660 PSI, and can be custom designed to achieve over 1,000 PSI per your specifications.

How well insulated are Sing Core panels?

The R-Value of a Sing Core sandwich core using EPS Foam is 3.5 per inch.  For technical specifications on our EPS foam, please visit this page.  The R-value of a Sing Core sandwich core using Urethane Foam is 6.5 per inch.

How big can you make Sing Core panels?

A standard sized panel is 4 ft. x 8 ft. We also specialize in custom sizes, which are available in any dimensions, up to 22 ft. by 40 ft. or larger.

Can you join together Sing Core panels?

Yes.  One way to join Sing Core panels is with a biscuit. visit this page.

Can I bond other materials to the surface of Sing Core panels?

Yes.  Many of our high-end millworks adhere other surface materials to a Sing Sandwich when used as substrate.  Standard lightweight plywood surfaces are easily adhered to with regular carpenter glue and cold-pressed.  If your intention is to laminate other materials to your Sing Core sandwich core, you should check with us first, to make sure that you are using the proper bonding agents) to achieve the results you desire.

Are your lightweight panels weather resistant?

Our panels are resistant to the degree of its surface material and/or its coating.  Sing Core panels can be manufactured to withstand the most extreme weather conditions, and are even used in underwater applications.

Where do you distribute?

We distribute to anywhere in the world, and have delivered panels to Europe and Asia.

What types of material can I laminate to SingCore?

Any substrate (skin) that is capable of carrying a load.

What is a torsion box?
A torsion box is best explained by this article.

( http://woodworking.com/ww/Article/What_is_a_Torsion_Box_8816.aspx  )

What is a “board foot”?

12″ x 12″ x 1″ = 1 Board Foot

12″ x 12″ x ½” = ½ Board Foot

12″ x 12″ x 2″ = 2 Board Foot

What if I want 1/4″ MDF?

Instead of 1/4 inch MDF, we use our own plywood-backed MDF which is made by laminating 1/8″ plywood to a 1/8″ sheet of MDF.  This still gives you the smooth MDF face to paint, hot press to, or apply other materials, like vinyl wrap(s).  You get the same smooth surface with added high performance because MDF is prone to movement.  If you have to have 1/4 inch MDF, we will make your panel to your specifications, but we may have to re-engineer the rest of the panel to assure high performance.

Will Sing Core’s spline joints crack?

Because of the stability of the patented Sing Core, spline joints in sectional Sing panels/doors will not crack, unlike traditional solid wood which is not stable enough to be used in this application.

Here at Sing Core, we’re proud to be providing the Sing Sandwich to the world thanks to your distributors and other sheet good and lumber suppliers across the USA. It is our sincere desire to see Sing Sandwich in use in all American homes.

Sing Sandwich has Sing Core exposed on the edge. This is normal and rudimentary for millworks and the high end developers that we work with day-in and day out. With exposed edges it is not uncommon for the average do it yourselfer to not have knowledge about how to close the edge of the Sing Sandwich, so for those we offer this simple guide to offer ideas of some of the ways the exposed edge can be closed or hidden when necessary for your project.

Edge-banding

Edge-banding can take on many different forms. The first method, as when working with a standard Sing Sandwich with plywood surface, would be to use a similar strip of wood to match the surface material cut to the thickness of the panel, then gluing the strop to the exposed area and finish the edges to your specifications. You may use a material that does not match the surface as edge-banding materials are readily available in almost any material including nylon, plastic, aluminum and other composite materials.

Interior Blocking

You can use any solid material cut to size for interior blocking to seal the edge of your Sing Sandwich. In most cases, this is a slender piece of wood that can be used not only as an edge but for purposes of connecting hardware or other panels. Simply router out the exposed Sing Core to the depth of your wood, clamp and glue as in traditional wood cabinetmaking.

U Channel

The U channel is an effective manner of closing the edge of a Sing Sandwich and it can be used in three alternative fashions depending on your intended application of your Sing Sandwich. Having three closed sides and one open side, the U Channel could be made of any material, like wood, plastic, aluminum, etc… and it can be bonded into place in any one of these ways.

1 End Cap Closure

Gluing the U cannel to the exterior of the exposed edge seals the edge nicely. While this is quite common it is the method that leaves a slight lip that may or may not affect the end product. The other U channel methods leave smooth edges without a ridge.

2 Embedded Open Cavity

Useful in many high tech designs, the embedded U channel with the cavity exposed can be elegant and useful when integrating your Sing Sandwich into your design. Possibilities about with the exposed cavity for running utilities, adding hardware and joining panels.

3 Embedded Closed Cavity

For a sleek, smooth effect using an embedded U channel, bonding inside with the closed edge exposed is an excellent way to use your U channel. Certain advantages come with using this method, especially if your U channel is made of aluminum or steel for machining, etc…

Embedded Aluminum Square Tube

Like the embedded, closed cavity U channel, extruded aluminum tubes in a square format (closed on all four sides) can also be embedded in your Sing Sandwich offering extra reinforcement and connection options.

Edge Fill

 Edges can be mildly routed out to your specifications and filled with any specified materials, like epoxy, to achieve the closed end results that you desire.

… And these are only some of the most popular ways of closing the edge of a Sing Sandwich.