I am re-doing a room that has vermiculite in the attic above it. Small amounts have leaked down during the demolition and I wanted to seal up a couple of spots and was looking for suggestions as to the best way.
1. A brick chimney which is in great shape. It is from a rarely used fireplace one story below. I left a 1/2″ gap at the ceiling from brick to sheetrock and was going to cover that gap with some trim. Was thinking about using the spray can foam to seal the gap but was worried about having it in direct contact with the brick. Would unfaced fiberglass be a better option?
2. a blue plastic ceiling box that has a light hanging from it. There is a little vermiculite dropping through the hole where the wire comes through. Would the spray foam be okay in that spot?
I hate that stuff. Thanks for any help. Brian
Replies
Most importantly, you know about the asbestos probably being in it right?
I would probably use great stuff, but the code hounds might jump in here. The issue with the fireplace is flammability, definitely the fiberglass would fit the bill there.
Oh yeah. That is why I am trying to minimize any leaking.
just wanted to mention it to be on the safe side..
http://www.epa.gov/asbestos/oppt.pdf
A link about Asbestos and Vermiculite.
I'm in the process of re-insulating my attic and, in a similiar situation, fabricated a metal flashing with 3M high heat caulking around the chimney. There is a high temp spray foam out there but I have yet to find it.
In some places electrician's putty (kinda like plumber's putty) may work better than the spray foam. You can knead up a little rope of it and press it aroung the wires in a box, eg.