Rigid Insulation Roof Over Decking

Plan to replace asphalt shingle roof with standing seam metal.

Rigid insulation roof over decking.

Rigid foam insulation installation prepare roof deck. 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. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. Appreciate this extremely helpful blog.

The first step with roof installation is to prepare the roof deck by getting rid of all dirt dust and contaminants. Now comes the really really big point. The unique construction of densdeck provides excellent flute spanning that stiffens and provides increased foot traffic resistance to the roof deck. Rigid insulation under a cool roof in zone 3.

The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system. The bottom layer of a single ply membrane roofing system is the roof deck or substrate. Foamular xps roof insulation for commercial buildings page 5 foamular xps roof insulation for commercial buildings foamular xps insulation is a rigid foam insulation which meets the needs of today s design professionals for a truly sustainable insulation product. Gable end detail overhang cut and then rebuilt to hide the thickness of the over roofing rigid insulation.

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. But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used. The roof deck can be plywood metal concrete or wood planks. How to install insulation board over an existing roof membrane.

This requires the use of soffit vents and a roof ridge vent to. I live in charleston sc in an old 1858 3 story wooden house. It is an acceptable practice to install a new roof over an existing roof membrane system provided that the roof deck is. Currently there is no insulation anywhere and the third floor basically an enclosed attic gets crushed by heat in the summer.

Polyisocyanurate extruded polystyrene xps.