In northern Mexico, where the heat is very strong in summer (the daytime temperature is above 40 degrees Celsius), is very common to use polyurethane on the roof expriado if concrete or sheet, and then on the poliretano waterproofing is added white and gives very good results. With two inches is sufficient and when the wooden ceiling and false ceiling (attic having American type) then in the sky fiberglass is placed three or four inches thick and the wooden roof extractors are placed either electric heat or fungus that work with the same heat that builds up in the attic.
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