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I have a pantry on my house, its attached to the kitchen but has its own slated roof and an outside wall. I have has issues with it getting damp, I have replaced the outside door as that was leaky, re-pointed the wall as it was in poor condition, now I want to check the roof.

There are patches of moss and other bits of weeds, I can't imagine they are supposed to be there, but I'm not sure what to do to get rid of them. How do I check for issues with the roof, and can I do anything about it myself if I find issues, or should I get someone in?

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If you have thick moss and plants growing on the roof, I think it's safe to say you have issues with the roof. –  DA01 Jul 4 '13 at 15:16
@da01 the moss is quite think, and there are a couple of plants. What's the best course of actions? –  beakersoft Jul 5 '13 at 14:06
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It's probably time to replace the pantry roof. But first, you need to understand how so much water got there that plants started growing on it! Is the pantry roof a much lower slope than the house roof it's attached to? How's the flashing between the house roof and the pantry roof? Are you in a rainy climate? Could the slate roof be leaking water onto wood framing or decking beneath the slate? What are the plants consuming for nutrients? Most things don't grow with only water... are they rooting in some wood?

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Shade + moisture = moss. Doesn't take much for moss to live on, it gets a good toehold on composition or rock without much dust available. Copper Sulphate granules can knock it down. –  Fiasco Labs Feb 18 at 2:45
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