I'm about to rip off the old felt shingles on the front of my house and replace with Hardieplank. As per I will be insulating with 75mmCelotex ga 4000 and my question is what sort of vapour barrier should I use? most of the ones I've looked at are for pitcheed roofs. As this will be hanging verticly I wondered what the best to use would be.
Thanks for any advice
Thanks for any advice