Is Rigid Foam Insulation Flammable

They keep your home at a comfortable temperature without the need to crank your heat.

Is rigid foam insulation flammable.

In other words rigid foam can be applied on walls foundations and roofs and works great for both retrofits and new constructions. Because this type of insulation is made from plastic it is combustible and may give. Polyisocyanurate also referred to as pir polyiso or iso is a thermoset plastic typically produced as a foam and used as rigid thermal insulation. Thermal performance is rated at r6 6 5 per inch but don t count on that if your winters are cold for the reasons we re about to explain.

When insulating above a ceiling with non ic rated recessed lighting the least flammable material to use is rock wool also called mineral wool or slag wool. Rigid insulation is one of the best tools to reduce your energy costs. Not only does it provide high r values but foam board insulation is also easy to install lightweight and can be used in any room of your home. Rigid foam insulation whether it is expanded or extruded polystyrene does have to be covered if it is installed in the interior of a building.

Rigid foam insulation also known as insulating boards provide high r values. You can even place it under the foundation slab. This wall covering must have a minimum fire rating to protect the insulation from quick combustion during a fire. The starting materials are similar to those used in polyurethane pur except that the proportion of methylene diphenyl diisocyanate mdi is higher and a polyester derived polyol is used in the reaction instead of a polyether polyol.

Pir polyiso or iso is a thermoset plastic product typically produced as a foam and used as rigid thermal insulation panel most often with aluminum foil facing.