Lean to roof and waterproofing

5 Apr 2013
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United Kingdom
Am looking into building a lean to on the side of my house to put bikes, tools etc in.
I feel ok about building the structure, walls etc. was going to use feateredge boards similar to a garden shed but am unsure of the best material to use for the roof? Was considering a shed type wood (chipboard or OSB) covered with roofing felt or the clear wavy corrugated plastic sheeting.
Am also unsure of what to do where the roof meets the house wall to prevent water from running down that gap.
Any advice would be much appreciated.
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I would use chipboard and felt it. Where the roof meets the house you need some kind of flashing like lead or a cheaper type.

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