Derived from American soy oil, BioBased 501 spray foam insulation is installed in liquid form and, the maker says, expands to 100 times its original size in seconds. It has a Class 1 fire rating, does not support mold growth, will not shrink, and emits no VOCs. 800.803.5189. www.biobased.net.
Sealection 500 is a nontoxic spray foam insulation that has a Class 1 fire rating and reduces heating and cooling costs by as much as 50%, the maker says. The product also limits airborne noise and dust, improving indoor air quality. 877.336.4532. www.sealection500.com.