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pryally in reply to @Howard

I prefer my second suggestion after thinking about it using DCM sitting on the existing roof membrane and not fixing them down puncturing it. Maybe three per side and fix the frame to these. Would weigh 120 kg plus the PVs

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Dammit in reply to @pryally

This sounds sensible, I'm going to but them up against the perimeter wall, as that's going to be to the North of the panels, so between that and the weight I don't think they'll go anywhere.

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Howard in reply to @Dammit

I don't think they'll go anywhere.

Unless the existing roof can't take 120kg + PVs

I'm sure it can. Unless it's rotten already.

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