Copper "L" vs. "M"

[moxiechef]

I can't find any old strings on this topic, sorry.

Building a new house and am wondering which copper to use.

All the supply lines will be run in the conditioned basement, don't know if that matters or not.

Thanks.

[master plumber mark]

i feverything is well grounded in the home

m will probably last about 40 years

L will probably last 55 years...

cost difference maybe about $300 bucks
on the whole house???

I have L above ground and K under the slab
in my 1964 home which we bought in 2001
and I am so glad I do....

[hj]

I have not used anything but "M" in houses since the 50's.

[master plumber mark]

I have not used anything but "M" in houses since the 50's.



if you were doing plumbing in the 50s,
than that puts you a ways up there..


that is basically all we ever used was M
and we never had a problem, in the late 60s....

though the L is
just more rugged..

[krow]

We use L mostly on commercial applications (resturaunts, bars, factories that rely on constant water usage, etc.........) We rarely ever use L on residential because of bottom line cost (as if copper prices aren't high enough so far)