Rigid Foam Insulation Roof Deck

Depending on the type of insulation you choose and the desired r value you want for your facility you may need to build up a few layers of insulation.

Rigid foam insulation roof deck.

Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. They had to look original. Nailbase must be vented in high snow load areas. The 6 inches of rigid insulation added to the top of the existing roof deck needed to be done in a manner that was invisible.

The r value is a measurement of the heat loss and heat gain. There s a reason polyiso rigid foam insulation is used in more than 70 of commercial roof construction as well as in many residential builds. The trim the frieze boards the fascia and the overhangs all had to look like they belonged. At r 4 it also has the lowest r value per inch.

Rigid foam insulation is available in two main types. Foamular extruded polystyrene xps rigid foam insulation offers foamular extruded polystyrene xps rigid foam insulation offers a comprehensive line of products in a wide choice of sizes thicknesses and edges with a lifetime limited warranty for the life of the home or building. Install nailbase for cladding. Owens corning foamular xps insulation is a closed cell moisture resistant rigid foam board ideal for many roofi ng applications including single ply protected roof membrane assemblies prma tapered vegetative roofs plaza decks architectural metal roofi ng and recover roofi ng.

Both install in the same manner but the foil faced product offers slightly more r value. The purpose of the requirement that rigid foam installed above roof sheathing meet certain minimum r values is to ensure that the roof sheathing stays warm enough during the winter to avoid moisture accumulation and possible sheathing rot. Polystyrene foam and foil faced polyisocyanurate foam. Polyiso is an easy cost effective sustainable and energy efficient construction material.

Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. All three types of rigid foam insulation expanded polystyrene eps extruded polystyrene xps and polyisocyanurate are suitable for use on the exterior of walls and roofs though they do not perform equally. Install roofing underlayment flashing and cladding as per best practices. Rigid foam installation after the roof deck is ready the rigid foam insulation is installed.