Yeah you are right about it being glass wool, and the health problems are annoying. Especially with the amount of time I will be up there separating my grow room from it, even with simple breath mask. I will probably be using GollyWog420's idea and make a wood floor for the grow area and the rest will be sealed off with a lot of cardboard and duct tape. Also I will be filtering air with HEPA filter and filter with an Ionizer.

Are there any other thoughts on this?