I will be boring a hole through a concrete basement wall and running 1″ copper pipe through. Looking for best techniques especially sealing it from water?
Thanks
I will be boring a hole through a concrete basement wall and running 1″ copper pipe through. Looking for best techniques especially sealing it from water?
Thanks
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Replies
Max,
You want to sleeve the copper in flexible foam wrap like is used to wrap drains through slabs. Hold the sleeve 1/4" back from the two wall surfaces, clean it well with rag and water if needed, let dry, then caulk with polyurethane caulk. Do not use silicone on copper. The wrap will act as a backer rod for the caulk. Once it skins over, it can be backfilled gently. It will cure underground.
Bugle
Thanks for the response.
Why no silicone on copper? How aboaut polyurethane, then?
Doesn't silicone exude acetic acid as it cures?
Yes. RTV silicone rubber gives off acetic acid as it cures. There are acid free silicones available, used in the electronics industry, but you won't find them in hardware stores.
I think I would use a Corky tape wrap instead of foam. It sticks better and is less permiable to water than the foam tape.
Dave
I have used something called "link-seal" it is rubber links with nylon caps on both ends with thru bolts nuts. it is a mechanically expandable seal
Buy the size for the O.D. of the pipe and core thru for a smooth finish inside the concrete then wrap the link seal . around the pipe and tighten 'er up ...... no glue ,mortar, or grout !
If it ever leaks just tighten 'er up some more . I think any plumbing supply house would have this in stock , but I know the BIG boxes do not . I have used it on elec. rigid as large as 5' with excellent results every time