Open cell foam has been proven to have insufficient vapour resistance during the cold Manitoba winter months and because of that we feel it is not suited for our climate and therefore we only spray it for commercially specified applications. 2lb Closed cell spray foam has a high per inch R-value (over 6 per inch), and is an excellent air and moisture retarder. It provides structural enhancements to buildings where it is sprayed, and is effective in all climates. In our cool Manitoba climate where the moisture drive is from the inside to the outside of a building, closed cell SPF can eliminate condensation on exterior walls helping to prevent air leakage and mould growth.
Open cell SPF has an R-value of 3.7 per inch. It insulates by trapping air in the foam cells. It acts as an air barrier and noise absorber. Open cell SPF is softer and more flexible than rigid closed cell foams, and, in general, is best suited for mixed or warm climates or as sound barrier for interior walls.