fire-retardant-doorsFire retardant doors can be made using our patented Sing torsion box composite cores. Natural wood lock blocks are positioned at locations as a necessary locking mechanism. The core material is wood framed by 1 3/4” natural wood for finishing strength and attaching hardware. We have made doors that are fire retardant by adhering noncombustible 3 mm Magnesium Board to the panels, which results in 0 Flame Spread and 0 Flame Development.

Note: Though we build panels that are used to make fire-rated doors, SingCore does not participate in the rating of fire doors. We only build to the engineering specifications of our customers who then have the door rated and stamped prior to installation.

Additional exterior (skin) options can be applied to the fire retardant door to meet your specifications and/or match appearance of designed structure. Bonding agent used in adhesion of the entire composite material is formaldehyde-free. The fire retardant Magnesium Board is a Class A product that meets ASTM E 84 certifications.

Lightweight vs. Heavy Fire Doors

Due to the heavy materials used in manufacturing fire doors they can be problematic to deal with. By using Sing Core in your fire retardant doors, your door will weight approximately 60% less than other fire retardant doors. This reduced weight allows your fire retardant doors to be utilized in applications where larger and heavier doors are just not practical.

Available in Any Size

Fire retardant doors with Sing Core inside are available in any size and are custom built to our architectural specifications. Every Sing Core fire retardant door is unfinished and guaranteed for 10 years of structural integrity.

Detailed Specifications:

Scope: Subject to local building codes, the standard SingCore unrated fire retardant 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: 1 ¾” side-hinged unrated fire retardant door panel manufactured by SingCore

  • Door component includes paint-grade door panel only

Door Panel Materials: SingCore unrated fire retardant doors are manufactured using Eco-friendly cold-press process. Composite materials include:

  • SingCore vertical wood-grain torsion substrate filled with recycled EPS foam
  • Solid wood implants are inserted as lock blocks or anchor points
  • Core material is framed with wood stiles and rails
  • Facings are 3mm (adjustable according to individual fire-rating performance specs) Magnesium Board
  • Formaldehyde-free bonding agent is used for adhesion of all components

Formaldehyde-free: This will help qualify for LEED credit points under MQ 4.4.

Additional Facing Material(s)

Your Sing untreated fire retardant door is built to our engineer’s specifications and can be custom designed to host any facing material to match the look and feel of your project. Nearly any additional flat exterior building material can be added and not affect the unrated fire resistant door’s rating. In this respect, each Sing fire retardant door is an individual work of art.

Engineered Ratings

SingCore only builds door blanks to architectural or engineer’s specifications. SingCore does not certify, nor stamp any doors for commercial use. All Sing doors used in commercial applications are certified, approved and/or stamped by engineers independently contracted or associated with each independent project.  SingCore does not rate, manufacture or sell any rated doors. Rating is the responsibility of the customer.

fire-door-sing-coreDelivery: Reasonable care is taken to ensure safe transportation of your SingCore fire retardant door from factory to your location including proper crating to protect the natural beauty of your door during transport.

Storage and Protection: Store your fire retardant SingCore 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 finishing of the SingCore unrated fire retardant door is the responsibility of the client due to the product being delivered in paint-grade 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.

  • 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: SingCore unrated fire retardant 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 SingCore unrated fire retardant doors just like you would any other standard door blank.

Strength Performance: Patented SingCore 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: SingCore 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 SingCore doors 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: SingCore 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: SingCore 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: SingCore manufactured doors are structurally guaranteed for 10 years under normal conditions, and professional Sing door blanks can be guaranteed to remain warp-free for 50 years.


See also: Door Technical Information

Fire Rated Case Study

As with all Sing unrated fire retardant doors, SingCore does not offer fire rating on any doors. Sing fire retardant doors are built to architectural specifications, like the Center for Architecture Design in Seattle, Washington (photos above). SingCore built the big extreme edge pivoting doors to the architects’ specs. In this case, SingCore provided 4 Sing pivot door panels, each weighing only 500 lbs for easy shipping and installation (it took half an hour to unload and install on the pivot hinge).  After those doors were completed on the job site, the weight neared 2000 lbs. to pass the city Seattle fire regulation, (the general contractor had to follow city requirement to add sheet rock). The doors were then submitted to the local municipality for rating approval. This is the standard procedure for rating Sing unrated fire retardant doors as no two Sing doors are manufactured exactly the same because each architectural door specification is unique to each door panel.

See: Pricing for how to buy

* 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.