We all know that modern science has put a great impact on our lives. It has changed the way we go about our routine much to our benefit. Its new inventions are a source of comfort and usefulness for all. Polyurethane is also one of the greatest innovations of modern science. It is an organic molecule which exists in the form of a polymer. Its structure is highly flexible and hydrophobic (water resistant). It is used in making foam seats, insulation panels, surface coatings and hard plastic parts. Polyurethane is chemically inert which means it does not react with any chemicals. All these characteristics make polyurethane an ideal substance for roofing purposes.
Source: http://www.houserepairtalk.com/f45/r-thane-spray-polyurethane-foam-roofing-11625/
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