Fire Rating For Roof Foam Insualation Boards

I ve written several posts about how to insulation basement walls in which i promote the use of foam board insulation as the first line of defense against moisture and mold.

Fire rating for roof foam insualation boards.

It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. 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. Expanding spray foam insulation has grown fast as one of the most popular options over time because of its cost. Some types of thicker foam board insulation are available but they may need to be special ordered.

Foam board insulation types. The glass fiber reinforcement provides improved fire performance and dimensional stability. Polyiso remains the only foam plastic insulation product for direct application to steel roof decks to earn fm approval for class 1 roof systems. 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.

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. 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. 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.

Rigid roof insulation board. 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 specially designed to hold a class a fire rating. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide.

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

Exposed foam board insulation fire hazards. Foam board insulation is easy to use and is a great diy way to add some insulation.