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    Bitumen, Thompson 10 year roof seal or something else to replace old fiberglass flat roof

    Hi, DIY noob here, we've just moved house and I now have a double external garage with a flat fibreglass roof that looks like it's letting water in. It's not dripping in or leaking, but there's black patches on the boards after it rains and signs of some mould on the boards underneath. I don't...
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