I show you some of the problems with asphalt flat roofs and felt flat roofs, these old roofs have blisters forming in them ( sometimes called bubbles) because of water vapour getting trapped under them. The fact that the roof has been painted with solar reflective paint only stops the roof from getting hot. Asphalt flat roofs when hot go soft and moisture trapped underneath vaporises and pushes through to the surface. If the asphalt has not been laid correctly over a subsurface that has been prepared correctly this also leads to pockets of moister forming.

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