1. Default Section

* 1. Please provide your email address. We value your privacy. This email address will be used ONLY to notify the winner.

* 2. Approximately how many times a polyurethane spray foam (closed cell) is better than a fiberglass batt in terms of the long-term thermal resistance per the unit of thickness?
E.g. What is the ratio of the R-value of 1 inch of SPF to 1 inch of batt?