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There could be several different reasons as to why the Topcoat on your Roof has started to crack.
Here are the most common reasons that we come across:
1. OSB Boards
The osb3 should be laid upside down on the rough side writing showing upwards. This should leave a 2-millimeter gap between the structure of the board.
No materials should be applied to the shiny side of the osb3.
2. Topcoat Applied too Thick
The dark grey topcoat may have been applied too thick. The installer may have also not sanded and/or wiped down with acetone before application this will cause clanging and banging. Any thicker than half a millimetre of topcoat applied will crack.
3. Roof Expansion
