Rigid Insulation At Unvented Roof

Insulating unvented roof assemblies.

Rigid insulation at unvented roof.

Foam free don t stay stuck in the sci finightmare of foam foam foam. Houston tx is located in a hot humid climate region. We agree that avoiding sheathing rot is critical and that air permeable insulation such as fiberglass or cellulose cannot be used alone. If you don t want to use sips or nailbase read this article tolearn the four basic approaches to insulating unvented roof assemblies.

Note that table r806 4 indicates the amount of insulation above the roof deck or air impermeable insulation below the roof deck required for condensation control assuming minimum required total insulation as indicated in section n1102 building thermal envelope. We re big fans of fine homebuilding. Senior engineer manager at icynene john broniek makes the case for the unvented attic assembly and why insulating the underside of the roof makes sense. Rigid insulation used to control condensing surface temperatures rigid insulation installed above roof deck.

Figure 3 shows the potential for condensation of an unvented roof assembly in houston tx. The quest for greater energy efficiency in buildings has led to increasing interest and need for insulation improvements in hvac equipment more airtight construction new materials and assemblies. Ratio of r value between rigid insulation and batt insulation is climate dependent.