Most polystyrene insulated door can be thicker but have a lower R-Value than polyurethane. Should you be looking for thermal efficiency along with a high R-Value, don't let yourself be misled by the depth of the door! A polyurethane Garage Door might look thinner but actually offers a much greater insulation R-value. That's due to how the insulating material expands during the manufacturing process to tightly fill the cavity between both steel panels as it bonds to the skins of the door. Not only does this make the door better insulated, additionally, it makes the door very strong and helps decrease noise while the door functions. How long your door will survive, what sort of punishment it can take, or even how much annual maintenance it is going to necessitate is firmly influenced by the material used to create the door.

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