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Hi, Thanks for the reply. Do I need to get permission even it is a small pitch (just enough for the water to run down).

HI, I have a detached garage that is 9ft wide x 19ft long. It has a flat roof that is beginning to leak. I would like to try and replace the flat roof including the boards. But I would like it to have a small pitch. How do I calculate the pitch. Is their some ratio I need to follow and how...