Originally Posted by Robes888
Why would the builder then install insulation in this manner?
I suppose "habit". I am not implying incompetence, as there may be a reason for it. However, I'd suggest you read about this and reason; SOME water vapor is going to get into the wall, if not liquid water in trace amounts from the outside, and where is it going to go w/ a vb
in the way? I would never have a vb
in a basement. It apparently works in some places, and can be a disaster in others. Visqueen is an old practice, that is even being shied away from above grade. People report all the time of mold in basement walls w/ vb
's. Do some reading on buildingscience.com and greenbuildingadvisor.com and make up your own mind. I think you'll see two ideas: fiberglass, though ubiquitous, is not real good insulation (another habit; it is readily available and cheap), and vb
's in basements CAN be a bad idea. I just like to caution people about both of them. After you read, talk w/ the contractor and see what he/she thinks. On the gaps between insulation and walls, read about convective loops generated thereby, and how you lose energy. Spaces are not a good idea for that reason.