Where did the idea come from that the houses must come down? We regularly remove both mould and asbestos contaminated drywall from buildings. The frame work and all mechanical is still good. Also does any one know if this is only a problem before painting or does it off gas continously like ureformaldihide insulation did? The asbestos thing is a bit of a joke as the only asbestos is in some drywall tape that is more than 20 years old. For this all the affected drywall must be bagged, boxed and taken to the correct landfill where they extract a hefty bribe to dig a hole in the old fill and cover it up. At least in theory. We do this with insurance jobs but I know that most home renovators and probably lots of contractors either have no clue it is in there or don't care and take it all to the drywall recycling depot where the tipping fees are much lower.