| http://www.w3.org/ns/prov#value | - SPF is durable, maintains physical properties over time, contributes little to the waste stream, and in a single product (depending on the formula and project) can take the place of three-four other products, including insulation, air barriers, sealants, vapor retarders, and weather barriers. *SPF reduces energy use in the following ways: Has high R-value per inch (open-cell 3.5 per inch and close
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