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Question:

How to make a building roof insulated against solar heat?

Hi, my building is hot in temperature in summers, so I am finding ways to tackle the problem by placing some heat insulating materials against the sunlight on the roof of my building. I have found several possible solutions, but none of them close to perfect. 1. grass layer: hard to maintain2. heat-insulating brick: might be too heavy to carry them to the roof3. heat-insulating coating: would it be damaged if we step on them? Are there things like heat-insulating carpets that would be convenient to instal?

Answer:

Closed cell spray foam applied to the inside of your roof sheathing will work just fine. It needs to be installed by a specialty contractor. Good Luck
If you're redoing the roof, a radiant barrier under the sheathing helps. So does insulation. And also, if there is an attic space there, consider putting in a fan to blow the hot air out.

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