What is Spray Foam Insulation?

Spray foam is made by chemical product that is combined of two types of materials, first isocyanate and second polyol resin, which reacts when mixed with each other and expand up to approx. 35-55 times its liquid volume after it is sprayed in gaps of houses  <a href=”https://www.evergreenpoweruk.com/spray-foam-insulation-cost-uk/”>spray foam insulation cost</a>