It is important to know the differences between open and closed cell urethane foams. If you are purchasing or specifying urethane foam for a home or commercial building, you must identify whether you will use .05 lb. /cu. ft., open cell foam, or 1.7 to 2.0 lb. /cu. ft. closed cell foam. This makes a difference in performance, application methods, and cost.
With the open-cell vs. closed-cell issue, there are two major factors to understand and consider.
This document is adapted from SprayFoam.com, with additions and changes made in blue.
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