Is 35 year-old under-attic-floor fiberglass insulation a health issue?
I’m asking about the formaldehyde issue. We’ll be spray foaming the attic soon–R38 rafters and R21 gable walls. The contractor would like to remove as much of the under-floor fiberglass as possible to make it a better conditioned space. We’re not so inclined, since our attic will really only be for storage, central AC maintenance, etc. and as long as the temps up there don’t vary by more than a few degrees, the winter cold or summer heat outside shouldn’t affect us in the floors below. We also have full doorway/stairs to the attic, so we can equalize the temps anytime we want to go up there just by opening the door.
If, however, this yellow paper-backed fiberglass is likely to present a health hazard, then we might consider removing it. And if we do, we’re not sure it should be by a company that it mainly geared to spray foaming. Perhaps there are certain procedures or equipment required to ensure that removal itself doesn’t stir up the toxic materials. Our contractor has a high suction volume cleaner that sucks out the fiberglass after they break it up by hand.
Ah, every project in an old house that starts out looking simple always takes more research and time to do it right….
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