Using Bitumen Paint Instead of Felt on Log Store? Information, help and advice on maintaining, installing and repairing a flat roof. Post your questions and view answers here

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Hi
I want to put up a log storage area, shelter with an osb sheet as a roof to keep of the rain. My question is, do I have to put on felt first or can I just use BITUMEN PAINT to keep the cost down? Is there any other paint on style material I could use if I cannot use BITUMEN PAINT?

Thanks