MOISTURE MANAGEMENT. Code Minimums for Exterior Foam Zone 6 2x4 walls: R-7.5 1.25” polyiso @...

MOISTURE MANAGEMENT

Code Minimums for Exterior Foam

Zone 6 2x4 walls: R-7.5

1.25” polyiso @ R-6/in 1.875” mineral wool @ R-4/in

2x6 walls: R-11.25 1.875” polyiso @ R-6/in 2.812” mineral wool @ R-4/in

Source: Avoiding the Global Warming Impact of Insulation Posted June 01, 2010 03:20 PM by Alex Wilson, buildinggreen.com

Interior Management Strategies

DehumidifiersBath fansRange hoodsSump pitsHRVs/ERVsTarget: < 45%

Exterior Management Strategies

OverhangsGuttersRainscreensThick foam and NO POLYPlywood

When walls go bad.

Follow These Guidelines:

Air leaks are bad. Air-permeable insulation is risky. The thicker the wall, the colder the

sheathing, and the riskier your wall. Rainscreens are good GREAT. Avoid OSB if possible where it’ll get wet. Exterior foam? Make it thick. Reverse laps are bad.

Source: How Risky Is Cold OSB Wall Sheathing?Posted on Nov 5 2010 by Martin Holladay, GBA Advisor

MOISTURE MANAGEMENT. Code Minimums for Exterior Foam Zone 6 2x4 walls: R-7.5 1.25” polyiso @...

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