There are two types of spray foam: closed-cell spray foam and open-cell spray foam.Closed-cell spray foam is a great choice for insulating damp basements and crawl spaces because of its higher density. Closed- Cell is also perfect for insulating homes or buildings in flood zones. It is the only type of insulation classified as an “acceptable flood-resistant material” by FEMA because of its ability to withstand direct and prolonged contact with water.
Open-cell foam (a lighter density foam) can be installed for a lower cost, but still target the R-value (insulation’s resistance to heat conduction). Open-cell is commonly used in attics and for sound proofing homes and buildings.