We're heavily insulating our barn conversion and making it wind and airtight. Before making a decision on the internal vapour barrier I wanted to find out as much as I could about the different products available, at the moment the three 'brands' that I am focusing on are:-
- Pro Clima
My main quandary is do we go for an 'intelligent membrane', permeable or impermeable membrane?
We're having to use PIR insulation to keep the wall build up to a minimum, build up will be:-
exg. wall, c.25mm cavity, PIR insulation, insulation between timber stud, air tight layer, service void, plasterboard.
Any advice would be greatly appreciated.
In addition, pro clima and DAFA use grommets for pipes etc penetrating the air tight layer whereas SIGA use tape, is there any research/opinion on which is the best option?