I've been lookng at some FAQs and fitting details relating to SIPs supplied by a local supplier
Is this normal, it seems to rather defeat the object of using the membranes?
I wouldn't worry about it ......
They are there to top the passage of water vapour, not actual water & therefore are not totally waterproof.
I've been watching a lot of Holmes on Homes videos on youtube, pretty certain that in one he said that each puncture hole in the membrane lets through a cupful of water a year.
He rips out a lot of soggy mouldy rockwool.
He's canadian - they need insulation there summer and winter !
George
Info on the topic here.
Sounds like a reason not to use rockwool in that particular scenario...
You can't rely on DPM being 100%. It needs to slow ingress to the point where what little makes it through can escape via other means.
Change proof to "control" & it makes more relative sense.
Slightly more troubling is 'bolts through the underfloor dpm...? How thick is the floor? Made of what?
Is it murican? Some of it is well garbled.
"Spray foams may also act as a vapour barrier"
Mmm
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