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  • I would never design (Arch Tech) a fixing detail at the waterproofing level (maybe ok for a garage) especially with a timber structure below. I would be looking at fixing an upstand at least 50mm high (ideally 150mm) so any penetrations don't have the potential of being in standing water.

    Could maybe use 100/140mm thick DCM blocks laid on there side (140mm 20kg) - might not even have to fix them down depending upon your frame design

  • I would never design (Arch Tech) a fixing detail at the waterproofing level (maybe ok for a garage) especially with a timber structure below. I would be looking at fixing an upstand at least 50mm high (ideally 150mm) so any penetrations don't have the potential of being in standing water.

    Yes, this is what I suggested. Although I wouldn't bother trying to meet the regs on height.

  • 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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