Dark-coloured felt will attract a great deal of heat in the summer and if the flat roof has insulation underneath, the temperature can only escape upwards. To counteract this white stone chippings are often used to reflect the sun. The problem with chippings however, is that if anyone walks on the roof, the chippings can get pressed through the felt and can cause leaks. Another way of protecting the felt is to use solar-reflective paint which is made specifically for this purpose (6).
The paint can be applied by brush or roller in a single coat. Any flat roof regardless of whether it leaks or not, will have its life extended by the application of solar-reflective paint.
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