Most polystyrene insulated door can be thicker but have a lower R-Value than polyurethane. If you're trying to find thermal efficiency as well as a high R-Value, do not be fooled by the depth of the door! A polyurethane Garage Door might seem thinner but really offers a much greater insulation R-value. That's due to the way 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 incredibly strong and helps decrease noise while the door operates. How long your door will last, what sort of punishment it can take, or even how much annual maintenance it is going to need is strongly influenced by the stuff used to make the door.

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