![]() ![]() Or do I just seal the outside with duct seal? If the latter, then that means the rest of that tunnel is just empty. Step 1 & 2: Quickflashing seal and taped edges. For faucet pipes through exterior walls, install a rubber gasket or flashing around the pipe on the exterior wall, if possible, in addition to caulking. ![]() The suggested duplicate may be a solution, but if it is I need some clarification on whether I should be trying to get duct seal to completely fill that tunnel around the pipe. Use caulk or canned spray foam to seal piping holes through the top plates, bottom plates, rim joists, and subfloor. ![]() Update: Based on the comments and suggested duplicate, I'll clarify that this pipe goes through a concrete tunnel at least 10 inches long. Note that this is already in place, so something like a sleeve that needs to be put in place at the time the line is run is not an option. So, I'm wondering is it OK to put expanding foam or caulking around that? Should I do just one or the other? Or should I pump foam deeper into the hole as thermal/ air insulation, and then after that's hardened, caulk around the outside for water seal? Or should I use some other product entirely? Helps seal conduit openings, gaps and holes against drafts, dust, moisture and noise. Zxfuture Pack of 8 White Seal Putty Waterproof Duct Seal Repair Sealing Clay, Quick Mending Mud for Drain Connection, Wall Hole, Air Conditioning Hole. This seal can be used in temperatures that range between -20 degree F up to 350 degree F. It adheres to many surfaces like: drywall, foam and fiberglass insulation, galvanized steel, aluminum, masonry, and wood. This material is non-toxic, non-corrosive and non-staining. It dries to a tough, flexible, and weather resistant seal. This sealant is easy to apply and is crack- and peel-resistant. The sealant is fiber reinforced and easy to apply by brush, gloved hand, or putty knife to flex duct, duct board, and sheet metal air ducts. It can also seal connections on flexible ducts or fiberglass duct boards. Use an air duct sealant to seal joints, seams and duct wall penetrations on metal air ducts. However, the sleeve stuff seems to be specific to underground penetrations through the wall? Find the right sealant for your needs at Lowe's. Googling this, I see a lot of mixed info - some ppl are saying expanding foam or caulk are OK, others are saying you MUST have a special sleeve. The gap is definitely large enough for insects to get through, and maybe small mice so I want to seal it up. It is not sealed around the pipe on the outside. If you want to be super picky, I bet that nipple is a plumbing pipe nipple rather than an electrical conduit nipple.Ī more common way to do this would be to use a cable connector fitting on the back of the box, instead of the nipple:Īgain you'd need to seal between the connector and the hole in the wall with silicone or duct seal to ensure that water doesn't seep in, and fasten the box securely to the outside wall.I have a gas pipe that comes through my poured concrete foundation about 12 inches off the ground: If the box was securely mounted to the wall from the outside, and the space between the nipple and the hole filled with silicone sealant or duct seal, then it would be OK.Īlthough it's done as shown all the time, technically the NM-B indoor cable is not rated for the outdoor location in the box. A threaded plastic bushing that threads onto the end of the nipple, rather than a lump of tape, would be suitable. You'd need a proper bushing where the cable exits to protect the cable from abrasion. The nipple doesn't extend too close to the inside finish wall, which is good. Nothing wrong with that, as long as you do it right. In the big scheme of things, the 55 savings isnt going to break the bank, but the whole point of this thread was 'Cheap Alternative to expensive acoustic backer putty pads'. It looks like they used short rigid nipple as protection around the cable. Using half a pound per electrical box, duct seal is 1.50 per box, or 30 for 20. There are lots of ways to run cable through the sheathing as seen in the picture, but there are some issues with what's shown. ![]()
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