julianf
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- devon, uk
So, on this corrugated roof -
Purlins run parallel to the ridge (ie horizontal) and corrugated steel fixes direct to them.
Where's the membrane go?
If it goes on top of the purlins, it won't run off if needed. Normally it goes on rafters and then freely drains but with purlins on the top of aframes and no rafters to speak of, I don't understand it.
I plan to put cellotex between the rafters and board below that.
If I understood how to do all this, it would have been done ages ago : (. Every time I think it's clear somthing else crops up that I don't understand!
Purlins run parallel to the ridge (ie horizontal) and corrugated steel fixes direct to them.
Where's the membrane go?
If it goes on top of the purlins, it won't run off if needed. Normally it goes on rafters and then freely drains but with purlins on the top of aframes and no rafters to speak of, I don't understand it.
I plan to put cellotex between the rafters and board below that.
If I understood how to do all this, it would have been done ages ago : (. Every time I think it's clear somthing else crops up that I don't understand!