Spray Foam Insulation Pt 2 Myths Busted | Build Show Podcast Ep. 227

Do not rely solely on spray foam for air sealing; it's a cavity insulation, and dedicated air barriers like tape and fluid-applied sealants are crucial for effective air and water control.

When using spray foam, especially open-cell, ensure sufficient thickness (e.g., 10 inches in Texas attics) to meet or exceed code requirements, as underspraying leads to inefficiency.

For critical areas requiring moisture control, structural strength, or maximum R-value in thin cavities, closed-cell spray foam is the superior choice over open-cell.

Consider hybrid insulation approaches like 'flash and batt' (1-2 inches of closed-cell foam with other insulation on top) to combine the benefits of different materials and potentially reduce costs.

Invest in a trained and reputable spray foam crew; confirm their quality control processes and adherence to manufacturer guidelines to mitigate toxicity risks and ensure a stable, cured product.

Utilize closed-cell foam for specific applications such as rim joists, foundation walls below grade, or encapsulating crawl spaces to create effective moisture and thermal barriers.

Prioritize continuous exterior insulation to improve overall building performance, aiming for at least one-third of total insulation on the outside of the building, especially as codes evolve.