Fire Rating For Roof Foam Insualation Boards

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.

Fire rating for roof foam insualation boards.

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. Polyiso remains the only foam plastic insulation product for direct application to steel roof decks to earn fm approval for class 1 roof systems. Fire rated expanding foam can provide up to 240 minutes of fire rating and is used as an efficient seal against gas and smoke.

Foam board insulation is easy to use and is a great diy way to add some insulation. Rigid roof insulation board. Shown to withstand delamination deterioration warping and jobsite damage more effectively than other roofing membrane substrates such as paper faced gypsum board fiber board and perlite insulation. 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. Exposed foam board insulation fire hazards. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. Thermax sheathing specially designed to hold a class a fire rating.

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. Thermax sheathing can be installed exposed to the. There are three basic foam insulation board products on the. An excellent fire barrier densdeck roof boards feature a noncombustible core and inorganic surface that offer greater fire protection than.

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. 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. 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. This large scale fire testing.

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.