Rigid Insulation Roof Over Decking

Rigid foam insulation installation prepare roof deck.

Rigid insulation roof over decking. The bottom layer of a single ply membrane roofing system is the roof deck or substrate. 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. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. 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. Plan to replace asphalt shingle roof with standing seam metal. Polyisocyanurate extruded polystyrene xps. How to install insulation board over an existing roof membrane.

This requires the use of soffit vents and a roof ridge vent to. 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. Rigid insulation under a cool roof in zone 3.

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. Appreciate this extremely helpful blog. 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. I live in charleston sc in an old 1858 3 story wooden house.

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. Materials appropriate for insulating sheathing with unvented cladding substrate include. 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.

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.