Rigid Foam Above Roof Deck

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. 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. Generally 40 of the total assembly r value should be above the roof deck.

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The assembly that i would like to use would be top to.

Rigid foam above roof deck.

First removing the shingles allows you to inspect the roof deck and address any questionable areas before encasing the whole thing in foam. Deck for a thick roof rigid foam insulation installed above the roof assembly can create an energy smart roof. However the drawing assumed an attic below with additional batt insulation. You might be able to get away with keeping the existing roofing in place but i would recommend removing the shingles for a few reasons.

My question was prompted by your article about using rigid foam insulation above the roof deck. The first step with roof installation is to prepare the roof deck by getting rid of all dirt dust and contaminants. Of cellulose insulation in the rafter cavities the roof shown here has an r value of approximately 63. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and.

Most unvented attics incorporate spray polyurethane foam spf on the underside of the roof deck and attic walls. Polyisocyanurate insulation above the sheathing and approximately 91 4 in. High r value unvented roof assemblies will require a proportionally larger amount of insulation above the roof deck for condensation control. Included with the article was a drawing illustrating a method using layers of polyiso with stacked 2x4 s at the eave.

Then 2x4s usually installed on the flat are installed above the rigid foam. The bottom layer of a single ply membrane roofing system is the roof deck or substrate. More insulation is needed above the roof deck in colder climates and where indoor relative humidity is above 35 in winter. The persist approach shown in that article includes rigid foam above the roof sheathing.

These 2x4s are extended at the eaves and rakes to create a roof overhang. With three layers of 11 2 in. The roof deck can be plywood metal concrete or wood planks. 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.

Contributing editor michael maines. Rigid foam insulation installation prepare roof deck.

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