unitblock replied to the topic Renovating With Asbestos in the forum Value Adding 14 years, 7 months ago
One extra bit of safety before you go working around the hole would be to dilute some PVA glue in a spray bottle and spray this directly onto the broken edges , this will bind the fibers together, and were a P2 dust mask just to be shore . A simple patch as explained by Adrien will cost very little.
good luck
Matt