Most polystyrene insulated door can be thicker but have a lower R-Value than polyurethane. If you are searching for thermal efficiency and also a high R-Value, do not be tricked by the thickness of the doorway! A polyurethane Garage Door might seem thinner but actually offers a much higher insulation R-value. That is because of the way the insulating material expands through the manufacturing process to tightly fill the cavity between the two steel panels as it bonds to the skins of the door. Not only does this make the door better insulated, in addition, it makes the door incredibly strong and helps decrease noise while the door works. How long your door will last, what kind of punishment it might take, or even how much yearly maintenance it is going to necessitate is firmly influenced by the stuff used to make the doorway.

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