Our extensive selection of mouldings includes flat trim moulding, a versatile addition to many projects. At Architectural Depot, our products bring you beauty, flexibility and quality. Flat trim moulding is crafted in rigid polyurethane, a high-density foam material with a weight similar to that of pinewood. Urethane has a closed cell structure that locks out moisture, which results in a product that will not warp, splinter or decay. In addition, urethane does not offer a food source to insects. It can be tooled like wood millwork. Flat trim moulding is factory-finished in a durable primer.