I'm trying to decide between:
a. Hilti CP 617 Firestop 6"X7" putty pads
b. 3M FireBarrier 7"X7" putty pads
Besides the obvious 1" difference, can anyone weigh in on any other major differences? I ask because eBay has a box of 20 Hilti pads for $50, vs. 10 3M pads for $50. Are the 3M pads twice as goodr? As far as I can find on each companies websites, the weight of each type are the same.
Agreed. You're not really using them for the firestopping. You're using them to seal up the holes in the boxes to keep sound in/out of the room. If they are the same weight, I'd go with the cheaper ones.
I saw these at Big Orange for less than $2 per pound block. (sorry, don't have dimensions)
They seemed very soft and pliable, and if we don't want the fire stop ability, why pay for it? probably not much different than buttering the boxes with caulk, just cheaper than tubes of accoustical caulk.
Would you just cover the holes? Or the whole box like the firestop putty pads?
I've used that stuff (or a similar stuff) for draft sealing in conduit penetrations. I bought it at HD, so it might be the same stuff you saw. It came in a "brick" in a waxed paper wrapper. It has the consistency of modeling clay. It seems to me that it would be awkward to wrap an electrical box with. If you were going to to just plug the holes, it would be fine. (In fact, that is what it is made for.) But I was of the impression that the putty pads were also to provide some mass to an otherwise flimsy plastic box, not just to seal up the gaps. (I might be wrong there.)
I think it would be a lot more difficult to wrap a box with it than it was to wrap it with a putty pad.
I just found and bought the 3M barrier pads on eBay for about half price (20 pad in one box) for about $25. Unfortunately the seller doesn't have anymore, but my point is that if you do want them, just spend a week or two browsing eBay and a deal should pop up.