Fire Rating For Roof Foam Insualation Boards

Foam board insulation types.

Fire rating for roof foam insualation boards.

An excellent fire barrier densdeck roof boards feature a noncombustible core and inorganic surface that offer greater fire protection than. 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. This q a article discusses the requirement for a fire resistant covering for foam and foam board board building insulation. The glass fiber reinforcement provides improved fire performance and dimensional stability.

Thermax sheathing can be installed exposed to the. 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. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. Polyiso remains the only foam plastic insulation product for direct application to steel roof decks to earn fm approval for class 1 roof systems.

There are three basic foam insulation board products on the. Rigid roof insulation board. Thermax sheathing specially designed to hold a class a fire rating. It s light weight provides ease of handling.

Exposed foam board insulation fire hazards. Foam board insulation is easy to use and is a great diy way to add some insulation. Celetox 100mm has rated class 1 in surface spread of fire and rated e in reaction to fire. Fire rated expanding foam can provide up to 240 minutes of fire rating and is used as an efficient seal against gas and smoke.

Some types of thicker foam board insulation are available but they may need to be special ordered. 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. 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. This large scale fire testing.

Expanding spray foam insulation has grown fast as one of the most popular options over time because of its cost. 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.