Sealing Plumbing and Electrical Penetrations
Working on a cool 60’s house. We’re upgrading alot of things but it will never be passive house level. Just a bit more comfortable and durable.
The house is on a hillside with an unconditioned basement/crawl space. There is a stepped CMU foundation wall down the hillside and you can walk under most of the house and crawl under the rest up higher on the hill.
As we demo’d drywall I found alot of prior rat/mice nest areas in the walls as well as alot of dead bugs, etc. I found alot of the plumbing and electrical penetrations through the bottom plate were oversized and the mice/rats were probably getting up into the walls from under the house through these penetrations.
Before we close up the walls I want to detail those so no more rodents can get in but alot of these are pretty sloppy. Big U shaped cuts for plumbing pipes, 1.5″ holes for 1-2 pieces of romex, etc. The plate below the panel has about 20 cords going through it and so many holes that they are almost just one big sloppy messy hole.
I am wondering if anyone has some good ideas for sealing up these penetrations before I close up the walls. Some I could use flashing tape or something but some are so sloppy I don’t know what the best thing would be. I know alot of people would use spray foam but I figured rats/mice might just chew right through it again.
Any ideas for me here?
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