Poly Foam Board and fiberglass batt - GreenBuildingAdvisor
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I’m in South Louisiana building new home, 2×6 wall construction. Considering installing 2″ poly foam board, then r-13 faced fiberglass batt in exterior wall. The siding I’m using is rated […]
Poly Foam Board and fiberglass batt LeePenn | Posted in Energy Efficiency and Durability on March 26, 2026 12:43am I’m in South Louisiana building new home, 2×6 wall construction. Considering installing 2″ poly foam board, then r-13 faced fiberglass batt in exterior wall. The siding I’m using is rated as structural, so vapor barrier is on exterior of studs. Also planning on installing double layer unfaced fiberglass batt then 2″ poly foam board (cut to fit in between joists) in ceiling. Attic is “not” conditioned. Any problems seen in this scenario? Thanks! Answer GBA Detail Library A collection of one thousand construction details organized by climate and house part Search and download construction details Join the leading community of building science experts Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field. Start free trial Related Questions Insulating an unfinished attic under the roofline: fiberglass batt + foamboard? Comparing fiberglass batt insulation R-values Spray foam over fiberglass batt Preventing air-washing in fiberglass batt insulation Replies Log in or create an account to post an answer. Sign up Log in
