Rigid Foam Insulation Under 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 board fiber board and perlite insulation.

Rigid foam insulation under roof deck.

After installing several layers of rigid foam above the roof sheathing these workers installed plywood above the rigid foam. This type of insulated roof assembly limits thermal bridging through rafters. Polyurethane spray foam metal roof insulation in order to add moisture barrier under metal roof you can spray the undersides of the roof by using a thick layer of polyurethane spray foam. The unique construction of densdeck provides excellent flute spanning that stiffens and provides increased foot traffic resistance to the roof deck.

Install nailbase for cladding. The rigid insulation over roof would have controlled the temperature of the condensing surface the underside of the roof deck so that i would not have had to use the spray foam except at the perimeter to provide the air seal to the tops of the walls. Position the foam board between the rafters and push it upward until it fits snugly against the underside of the roof deck. Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance.

This construction approach was first used in the 1970s and it has been implemented much more widely since it was first included in the international code council s icc model building code in 2007 irc section 806 4. It will help you to eliminate problems that may come when the house becomes extremely cold in the winter and terribly hot in the summer. This can be perlite concrete vermiculite concrete concrete made with polystyrene aggregate or cellular concrete. Strip the old roof lay down ice and water membrane add the foam overlapped screw down the 2x4 s add sheathing shingle.

Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. Install rigid insulation board in multiple layers with joints offset vertically and horizontally between adjacent layers. The snugness of the foam itself should be sufficient to hold the strips. The plywood was fastened through the rigid foam to the rafters with long screws.

Rigid foam under roof sheathing indydog.