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Strategies for Managing Exterior Foam in Zone 6: Insulation Standards and Best Practices

This document outlines key management strategies for the use of exterior foam insulation in Zone 6, focusing on optimal performance for 2x4 and 2x6 wall constructions. It recommends specific R-values for polyiso and mineral wool insulation to minimize the global warming potential associated with insulation materials. Interior and exterior management strategies are provided to prevent moisture-related issues, emphasizing the importance of air sealing, effective drainage, and proper material choices. Best practices to enhance durability and efficiency of building envelopes are discussed.

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Strategies for Managing Exterior Foam in Zone 6: Insulation Standards and Best Practices

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  1. MoisTURe management

  2. 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

  3. GWP

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

  5. Interior Management Strategies • Dehumidifiers • Bath fans • Range hoods • Sump pits • HRVs/ERVs • Target: < 45%

  6. Exterior Management Strategies • Overhangs • Gutters • Rainscreens • Thick foam and NO POLY • Plywood

  7. When walls go bad.

  8. 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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