Rigid Insulation Roof Over Decking

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.

Rigid insulation roof over decking.

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. Polyisocyanurate extruded polystyrene xps. The unique construction of densdeck provides excellent flute spanning that stiffens and provides increased foot traffic resistance to the roof deck. The first step with roof installation is to prepare the roof deck by getting rid of all dirt dust and contaminants.

The roof deck can be plywood metal concrete or wood planks. 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. 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. Currently there is no insulation anywhere and the third floor basically an enclosed attic gets crushed by heat in the summer.

This requires the use of soffit vents and a roof ridge vent to. Now comes the really really big point. 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. It is an acceptable practice to install a new roof over an existing roof membrane system provided that the roof deck is.

Rigid foam insulation installation prepare roof deck. 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. Gable end detail overhang cut and then rebuilt to hide the thickness of the over roofing rigid insulation. I live in charleston sc in an old 1858 3 story wooden house.

Materials appropriate for insulating sheathing with unvented cladding substrate include. Appreciate this extremely helpful blog. Rigid insulation under a cool roof in zone 3. The bottom layer of a single ply membrane roofing system is the roof deck or substrate.

Plan to replace asphalt shingle roof with standing seam metal.