Rigid Insulation Roof Over Decking

It is an acceptable practice to install a new roof over an existing roof membrane system provided that the roof deck is.

Rigid insulation roof over decking.

The first step with roof installation is to prepare the roof deck by getting rid of all dirt dust and contaminants. 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. Rigid insulation under a cool roof in zone 3. This requires the use of soffit vents and a roof ridge vent to.

Polyisocyanurate extruded polystyrene xps. 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 insulation installed over the roof deck must be installed in multiple layers with joints offset in order to control convective looping at joints between insulation panels. Currently there is no insulation anywhere and the third floor basically an enclosed attic gets crushed by heat in the summer.

Plan to replace asphalt shingle roof with standing seam metal. Materials appropriate for insulating sheathing with unvented cladding substrate include. Appreciate this extremely helpful blog. I live in charleston sc in an old 1858 3 story wooden house.

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. The bottom layer of a single ply membrane roofing system is the roof deck or substrate. When installing rigid insulation in an attic to be finished as a living space you must provide a route by which hot air can escape. How to install insulation board over an existing roof membrane.

The roof deck can be plywood metal concrete or wood planks. Now comes the really really big point. Rigid foam insulation installation prepare roof deck. Gable end detail overhang cut and then rebuilt to hide the thickness of the over roofing rigid insulation.

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.