Rigid Insulation Under Roof Deck

Rigid foam installation after the roof deck is ready the rigid foam insulation is installed.

Rigid insulation under roof deck.

Install nailbase for cladding. When installing a foil faced foam board insulation. For most of us in the low slope roofing industry it s considered to be absolutely standard to have insulation placed above the roof deck. Nailbase must be vented in high snow load areas.

Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. Install roofing underlayment flashing and cladding as per best practices. For standard steel deck construction this approach has many advantages such as. Additionally densdeck has been shown to withstand de lamination deterioration warping and jobsite damage more effectively than other roofing membrane substrates such as paper faced gypsum board fiber board and perlite insulation.

The dew point is typically within the insulation layer lowering condensation risks. The unique construction of densdeck provides excellent flute spanning that stiffens and provides increased foot traffic resistance to the roof deck. In addition to installing the foam board on the underside of the roof deck you can attach it to the bottom edges of the. When installing rigid insulation in an attic to be finished as a living space you must provide a route by which hot air.

The r value is a measurement of the heat loss and heat gain.