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