Home>Discussions>PLUMBING>How to "cap" an abandoned lead pipe?
8 posts / 0 new
Last post
letsdothis
How to "cap" an abandoned lead pipe?
letsdothis

Our main water supply was replaced a little over a year ago. The old lead supply line was abandoned and cut-off in the basement. It looks like the cut was made above the lead pipe where copper pipe picked up. See photo here: https://www.dropbox.com/s/k863xma831iw1kz/Abandoned-lead-pipe.jpeg?dl=0

Every now and then, when we have an unusually heavy rain, water will find its way in through the pipe. What's the best way to "cap" the pipe so we can avoid this in the future?

Thanks!

dj1
Re: How to "cap" an abandoned lead pipe?
dj1

Rub the pipe with an abrasive Emery cloth, and if you see the pipe shines like a new copper penny, than it's copper.

If it's copper, you cap it and solder the cap in.

Not sure? call a plumber.

Fencepost
Re: How to "cap" an abandoned lead pipe?
Fencepost

Since it's lead, there should be a way to solder it, but that might take some talent.

johnjh2o
Re: How to "cap" an abandoned lead pipe?
johnjh2o

If it is lead then just cut it and using two hammers flatten the end.

dj1
Re: How to "cap" an abandoned lead pipe?
dj1

The top part, it looks like it was squeezed, is brown red. Looks like copper. I would clean the pipe to verify.

johnjh2o
Re: How to "cap" an abandoned lead pipe?
johnjh2o

Below the copper pipe it is lead.

letsdothis
Re: How to "cap" an abandoned lead pipe?
letsdothis

Definitely copper above the lead pipe. Will see what I can do with it. Thanks.

bill
Re: How to "cap" an abandoned lead pipe?
bill

It is a lead pipe below the bulge. Above the bulge it is copper. This is what I would do.
1)cut the lead pipe just below the bulge. with a hack saw
2) clean very very well both the inside and the out side 4 inches back from the cut. a fitting brush for the inside
3) brush on solder paste on the inside and out side.
4) take some thing very heavy with a flat surface ie a sledge hammer, and hold it very firmly against the lead pipe.
5) flatten the lead pipe by hitting the lead pipe with another hammer.
6) now heat the end on the lead pipe very slowly and apply 50/50 solder so that the lead runs into the flatten pipe.
7) leave a bead of solder on the outside of the cut pipe, if the end of the pipe melts a little this is fine

Sponsored Stories

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.