Spray Foam Attic Thermal Barrier

When these systems pass a full scale nfpa 286 test in accordance with the interior finish acceptance criteria of ibc 803 1 2 1 the use of the system omits the code prescribed thermal barrier it does not make the intumescent coating a. If you ve got spray foam insulation in an attic for example it s probably already separated from the living space by a thermal barrier. Nothing unusual about that.

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According to a guide for spray foam installers thermal barriers and ignition barriers for the spray polyurethane foam industry when exposed to fire sources such as trash fires welding arcs cutting torches or red hot metal unprotected spf spray polyurethane foam can ignite and may result in a flash fire.

Spray foam attic thermal barrier.

If a home has spray foam insulation in an attic or crawl space the building code requires using materials or assemblies that offer some fire resistance but not as much as is required for a thermal barrier. The same applies for spray foam and intumescent coating systems that meet interior finish test requirements. Thermal barrier is applied between foam and interior space to delay the temperature of the foam during a fire situation and delay prevent the foams involvement in a fire. In the summer radiant heat is the biggest contributor to heated attic spaces so spray foam insulation may not be as effective in keeping attics cool.

To be classified as a thermal barrier the material must resist severe fire exposure for a minimum of fifteen 15 minutes. Spray foam insulation doesn t protect attic spaces from radiant heat but does protect them from convection and conduction. If a home has spray foam insulation in an attic or crawl space the building code requires using materials or assemblies that offer some fire resistance but not as much as is required for a thermal barrier. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits but then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents.

A thermal barrier is a material applied between foam plastics including spray polyurethane foam and interior spaces designed to delay the temperature rise of the foam during a fire situation and to delay or prevent the foam s involvement in a fire. Earlier this year i got a question about a home that had spray foam insulation in the attic. If you ve got spray foam insulation in an attic for example it s probably already separated from the living space by a thermal barrier.

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