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Posted By: SteamyTeaI put insulation hard against the sarking and it was wet within hours, redid it with a ventilated gap and not had a problem since.
Posted By: davidfreeboroughWas the air barrier in place, any loft hatches closed & all ceiling penentrations sealed?
Posted By: Phil.Chaddah-DukeWe already have 70mm PIR board on top of the rafters so no issue with thermal bridge through rafters, with breathable membrane on top and then battens and counter battened and tiles. I know it would have been better if the PIR had been something breathable but its where we are, we are installing airtight VCL on inside of service void and then fermacel boarding. Looking at the videos I think the Icynene can easily fill 200/300mm in one go.
Posted By: Phil.Chaddah-DukeAnyone else have a view on air tightness of Icynene, is it really as good as a membrane system. Was searching the web today to find some quoted figures on air tightness but very little info on this aspect of it! Question is can I really do away with my internal VCL? Would avoid a lot of work and expense so will be happy to go that way if possible.
Posted By: TimberYeah, what about gaps between the foam and the timber rafters? How well will the foam stick? How will you deal with air tightness detailing at junctions? How will you control moisture vapour moving through the structure?
Posted By: Phil.Chaddah-DukeTimber, as we have PIR board on top of rafters already then as Borpin highlighted I would be effectively sealing any insulation between two VCL which is a worry. Is the thinking correct that if I can create the airtightness on the inside without a VCL then any moisture can pass in and backout again with no problems?
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