Size of hole for 1/2" copper pipe through floor

FirstAndTen · 02-02-2011, 01:25 AM

Pretty simple question. How snug should the hole be that a copper pipe runs through? I bought an 11/16" bit for 1/2" copper pipe.

How much expansion and contraction should one allow for? I noticed there is another place in my house where 1/2" copper is running through, but the previous H.O. used like a 1" bit.... looks sloppy, but got me second guessing myself.

proremodel · 02-02-2011, 02:18 AM

I normally run 3/4" bits for 1/2 copper. I dunno why just what I have always done lol.

Just Bill · 02-02-2011, 07:53 AM

1/2" copper is 5/8OD, you do not want the hole to fit tightly or you will get squeaking, ticking as pipe expands. As suggested 3/4" or larger.

tcleve4911 · 02-02-2011, 08:41 AM

I've always used a 1"
It gives room for play and is usually covered by a cover plate anyway

**TheEplumber** · 02-02-2011, 09:42 AM

1 3/8" with pound-in isolators

FirstAndTen · 02-02-2011, 10:27 AM

Can anyone find a photo of a "pound-in isolator" or a "cover plate" as described above?

Thanks for the replies!

VIPlumber · 02-02-2011, 01:33 PM

The pound in isolator looks like this

and is called a pex suspension pipe clamp (I know it as mickey mouse ears)
and the cover plate is known as an escutcheon plate/ring.

**TheEplumber** · 02-02-2011, 08:46 PM

My version of pipe isolator