06/08/2026
Not everyone can invest in the Full Monty but spray foaming the entire basement foundation and rim has the greatest impact on the dynamics, environment, comfort level and energy efficiency in your home. When costs determine otherwise, the rim joist pockets are the linchpin, with the greatest area of leakage, frosting and potential mold. So spray foam this section! However, you also need to take it to the next level by using the foam to seal the top plate of the stud wall to the basement wall. (Sealing this gap simply can’t be done effectively with the poly vapour barrier). As a result, warm conditioned air can slip down inside this wall cavity causing the wall to frost during the winter months. This leads to homeowners grief, damage and eventually a costly demolition and repair. Yes, it happens every year and we get this call. This missed detail keeps us busy! See photos.