How to Insulate Crawl Space Walls in a Cold Climate
Key Takeaways In a vented crawl space, insulate the floor above the crawl space—not the foundation walls. In a conditioned or encapsulated crawl space, rigid foam or closed-cell spray foam belongs on the foundation walls. Fix water entry first, then install a continuous floor vapor retarder and seal foam-board joints and edges. Keep the crawl space’s relative humidity between 50% and 60%, and leave a 3-inch termite inspection gap at the top of wall insulation. Table of Contents Should you insulate crawl space walls or the floor? How does wall insulation help in a cold climate? Which crawl space wall insulation is best for DIY? What R-value should crawl space walls have? How to install rigid foam on conditioned crawl space walls What moisture and humidity checks should come first? Which approach fits your crawl space? Common crawl space insulation mistakes to avoid Frequently Asked Questions Key points to remember How to insulate crawl space walls in a cold climate depen...