FAQs

Thermafiber Insulation does not have an hourly fire rating because it is not a stand-alone product. Thermafiber materials are dependent upon mechanical fasteners and other construction components that must also stay in place for the time period of fire exposure. If these components fail, then the Thermafiber insulation will fall out of place, jeopardizing the fire performance of the assembly. For hourly fire ratings on specific assemblies, go to Underwriters Laboratories Online Fire Resistance Directory at http://www.ul.com/ or Intertek’s (Omega Point Laboratories Inc.) directory at http://www.intertek-etlsemko.com/.

FireSpan® 90 or FireSpan® 40 are the only Thermafiber curtain wall insulations approved for use in UL and Intertek (OPL) tested and listed perimeter fire containment assemblies.
Thermafiber FireSpan Technical Bulletin
Thermafiber OPL/Intertek Listed Products

Thermafiber Safing insulation, in conjunction with Thermafiber FireSpan 90 or FireSpan 40 insulation, provides fire containment at the perimeter of high-rise buildings by confining the fire to the floor of origin. Extensive fire testing has shown that low-melt-point insulations (such as glass fiber and foam plastic types) do not protect the integrity of spandrel panels. Low-melt-point insulations used in combination with Thermafiber Safing insulation negate the fire containment performance of the Safing insulation.
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The standard safe-off area width Thermafiber has evaluated through fire tests with standard 3″ impaling safing clips is 8″. For greater gap widths (up to 12″), Thermafiber provides recommended installation methods for protecting wider safe-off openings.
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In assemblies where Thermafiber cannot be installed from the top of the slab edge, Thermafiber Safing insulation can be installed from underneath the slab.
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Thermafiber FireSpan installed to protect the precast panel, with Safing insulation compression-fit within the safe-off area, can provide fire containment for precast wall assemblies.
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Thermafiber no longer offers a kitchen/grease duct insulating product, since we have not tested the most current test standards required for fire-rated kitchen/grease duct assemblies.
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When the material is wet, the insulating value is reduced. However, if the insulation blanket is allowed to dry and is not mechanically changed in form, the thermal properties will return to their original levels.
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Thermafiber insulation is an inorganic material. Therefore, it does not provide a food source, which is necessary for mold growth. Thermafiber has conducted fungi-resistance testing on our blanket products per the ASTM Standard C 1338, which is the test method for determining the resistance of insulation to the growth of fungi. Thermafiber 4.0 and 8.0 pcf density blankets were evaluated. Test results determined the material to have no fungal growth.
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FireSpan 90 is a nominal 8 pcf density product. FireSpan 40 is a nominal 4 pcf density material.
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ASTM C 612 is a standard that applies to thermal insulation in high temperature applications.
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Thermafiber is a slag-based mineral wool insulation. Slag is a byproduct of steel production. The slag is melted and spun into fibers.
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The shelf life of Thermafiber smoke seal compound is 12 months from the date of manufacture.
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Thermafiber insulation can be purchased with no facing (plain) or with an FSP foil facing applied to the blanket. The foil facing provides a vapor retarder. The FSP foil facing has a 0.02 maximum perm rating.
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Testing per ASTM C1104 resulted in moisture absorption of 0.0022%.

Adding a vapor barrier facing to RainBarrier® products will reduce perm rating, defeating the intended performance of the product.
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Thermafiber insulation products provide a high recycled content, energy efficiency through high R-Values, and indoor environmental air quality with excellent acoustical performance and low off-gassing.

Recycled content (post-industrial):
EPA Choice fiber mineral wool product (U.S. govt. projects) ……………… 75%
Standard fiber mineral wool products ……………………… Minimum 70%
Recycled content (post-consumer):
All Thermafiber products ……………………………… 0%

The only component in Thermafiber blankets that contains trace amounts of formaldehyde is in the binder system (the glue that holds the fibers together to form a blanket). Even with this trace amount, blankets are cured in a high-temperature oven that virtually eliminates the “free formaldehyde.” Thermafiber blankets have been evaluated by an independent testing laboratory for emissions of formaldehyde. Results verified only trace amounts (12 ppb) of formaldehyde.

Thermafiber products do not contain CFCs or HCFCs. Nor does the manufacturing of our products produce these ozone-depleting substances.
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Some of the insulation facings that Thermafiber, Inc. purchases for application to its products contain trace amounts of Deca-BDE. The maximum allowable limit of Deca-BDE pursuant to the statute is 0.1% on a weight basis for finished or component products. Since Thermafiber products are considered a finsihed product, the allowable level is based on the total combined weight of the insulation and facing. All faced Thermafiber products fall below the threshold limit of 0.1% by weight as set by ORS 453.085(16).
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Thermafiber does not have a certification program for any of our products or their installation. We rely on field inspectors and building code officials to determine that the product(s) were installed correctly and that they meet the intent of the original design.
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Thermafiber products are currently UL Listed and Approved for use in many UL tested and listed assemblies and designs. Thermafiber products carry the UL Approved Label. Both FM Approval and UL Approval follow the same process.
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