Insulation Entirely Above Roof Deck

Roofing with insulation entirely above deck a roof with all insulation 1 installed above outside of the roof structure and 2 continuous i e uninterrupted by framing members. Ashrae 90 1 defines a roof with insulation entirely above deck as a roof with all insulation 1 installed above outside of the roof structure and 2 continuous i e uninterrupted by framing members table 1 compares prescriptive requirements of the 2004 and 2007 editions of ashrae 90 1. Generally more insulation is needed for condensation control in colder climates.

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Insulation entirely below the roof deck.

Insulation entirely above roof deck.

2007 levels are based on today s energy. Also the higher the indoor humidity the more insulation is needed to avoid condensation. The ratio of insulation above the roof deck or air permeable insulation below the roof deck is a matter of climate and interior conditions. Insulation entirely above the roof deck.

Placing all of the iecc code required insulation above the roof deck with a vapor retarder will provide acceptable hygrothermal performance in all climate zones figure 7. This meets the requirements of section 5 1 4.

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