Fire Rating For Roof Foam Insualation Boards

There are three basic foam insulation board products on the.

Fire rating for roof foam insualation boards.

An fm class 1 designation means the roof assembly has been subjected to a series of tests in addition to external and internal fire exposure including wind uplift water leakage and impact resistance. Since most fire codes call for a minimum of half hour fire rating over foam insulations paneling would probably not provide a sufficient fire barrier over the foam insulating board. Rigid roof insulation board. Thermax sheathing can be installed exposed to the.

An excellent fire barrier densdeck roof boards feature a noncombustible core and inorganic surface that offer greater fire protection than. Exposed foam board insulation fire hazards. It s light weight provides ease of handling. Fire rated expanding foam can provide up to 240 minutes of fire rating and is used as an efficient seal against gas and smoke.

Thermax sheathing specially designed to hold a class a fire rating. Composed of a closed cell polyisocyanurate foam core bonded in the foaming process to 1 2 thick duraboard an expanded perlite mineral aggregate board on one side and a fiber glass reinforced facer on the other. This large scale fire testing. Polyiso remains the only foam plastic insulation product for direct application to steel roof decks to earn fm approval for class 1 roof systems.

Examples include 1 polyisocyanurate roof insulation and spray polyurethane foam roofing systems directly applied to steel roof decks 2 some metal faced polyurethane and polyisocyanurate laminated panel products and 3 some polyurethane foam sealant applications. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. Expanding spray foam insulation has grown fast as one of the most popular options over time because of its cost.

Foam board insulation types. Thermax sheathing is a nonstructural rigid board insulation with a glass fiber infused polyisocyanurate foam core laminated between 1 0 mil smooth reflective aluminum faces. Celetox 100mm has rated class 1 in surface spread of fire and rated e in reaction to fire. This q a article discusses the requirement for a fire resistant covering for foam and foam board board building insulation.

Some types of thicker foam board insulation are available but they may need to be special ordered. The glass fiber reinforcement provides improved fire performance and dimensional stability.