Moisture management
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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. GWP. Source: Avoiding the Global Warming Impact of Insulation

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Moisture management

MoisTURe management


Code minimums for exterior foam
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
Interior Management Strategies

  • Dehumidifiers

  • Bath fans

  • Range hoods

  • Sump pits

  • HRVs/ERVs

  • Target: < 45%


Exterior management strategies
Exterior Management Strategies

  • Overhangs

  • Gutters

  • Rainscreens

  • Thick foam and NO POLY

  • Plywood



Follow these guidelines
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


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