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-   -   Size of hole for 1/2" copper pipe through floor (http://www.diychatroom.com/f7/size-hole-1-2-copper-pipe-through-floor-94285/)

FirstAndTen 02-02-2011 01:25 AM

Size of hole for 1/2" copper pipe through floor
 
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
http://www.pexuniverse.com/sites/def.../PXA4711_3.jpg
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.
http://img3.prosperent.com/images/25...6002853-00.jpg

TheEplumber 02-02-2011 08:46 PM

1 Attachment(s)
My version of pipe isolator

yuridingmayl 09-05-2013 08:00 PM

Pipe Isolator?
 
Redacted

Fix'n it 09-05-2013 10:25 PM

hey guys. would it be ok to fill the gap with caulk ?

TheEplumber 09-05-2013 10:38 PM

Quote:

Originally Posted by Fix'n it (Post 1238706)
hey guys. would it be ok to fill the gap with caulk ?

It's good practice to use an isolator.
Energy code in my area requires the hole to be sealed with foam- if it is coming from the crawl space

Fix'n it 09-05-2013 10:43 PM

Quote:

Originally Posted by TheEplumber (Post 1238713)
It's good practice to use an isolator.
Energy code in my area requires the hole to be sealed with foam- if it is coming from the crawl space

ok, will do. do those isolators hold the pipe ?

wkearney99 09-05-2013 10:44 PM

Quote:

Originally Posted by TheEplumber (Post 1238713)
It's good practice to use an isolator.
Energy code in my area requires the hole to be sealed with foam- if it is coming from the crawl space

Some areas require it to be the red fire blocking foam.

TheEplumber 09-05-2013 10:47 PM

Quote:

Originally Posted by Fix'n it (Post 1238715)
ok, will do. do those isolators hold the pipe ?

To a point. The pipe will slide if you push or pull


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