by Dragonheart » Wed Mar 11, 2009 9:55 am
Depends on the type of insulation used Kev for the thickness, if its a dense material then less is needed. Like if it was Rockwool, cause thats compressed insulation, then you wouldnt need 12 inches at all.
Filling the cavities in the outer walls is def a good plan, it'll be big in the future, I myself have never used it and dont know any contacts, but we were supposed to be looking into for a government body just before the recession hit. One thing to be aware of when filling the cavity is that the tops of the cavity are blocked at the gables, opes, and eaves, or else you'll be pumping insulation and itll just be flowing out over the walls. I'm not sure if they carry out a heat test first to assess the areas that may be open so they close them off, I know they do with roofs.
Check up the usual suspects anyway, Moy, Kingspan, and Rockwool, they might have some more info on it for you.