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Old 02-02-2011, 01:25 AM   #1
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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.

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Old 02-02-2011, 02:18 AM   #2
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Size of hole for 1/2" copper pipe through floor


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

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Old 02-02-2011, 07:53 AM   #3
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Size of hole for 1/2" copper pipe through floor


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.
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Old 02-02-2011, 08:41 AM   #4
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Size of hole for 1/2" copper pipe through floor


I've always used a 1"
It gives room for play and is usually covered by a cover plate anyway
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Old 02-02-2011, 09:42 AM   #5
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Size of hole for 1/2" copper pipe through floor


1 3/8" with pound-in isolators
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Old 02-02-2011, 10:27 AM   #6
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Size of hole for 1/2" copper pipe through floor


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

Thanks for the replies!
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Old 02-02-2011, 01:33 PM   #7
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Size of hole for 1/2" copper pipe through floor


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.
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Old 02-02-2011, 08:46 PM   #8
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Size of hole for 1/2" copper pipe through floor


My version of pipe isolator
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Old 09-05-2013, 08:00 PM   #9
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Size of hole for 1/2" copper pipe through floor


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Old 09-05-2013, 10:25 PM   #10
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Size of hole for 1/2" copper pipe through floor


hey guys. would it be ok to fill the gap with caulk ?
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Old 09-05-2013, 10:38 PM   #11
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Size of hole for 1/2" copper pipe through floor


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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
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Old 09-05-2013, 10:43 PM   #12
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Size of hole for 1/2" copper pipe through floor


Quote:
Originally Posted by TheEplumber View Post
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 ?
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Old 09-05-2013, 10:44 PM   #13
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Size of hole for 1/2" copper pipe through floor


Quote:
Originally Posted by TheEplumber View Post
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.
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Old 09-05-2013, 10:47 PM   #14
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Size of hole for 1/2" copper pipe through floor


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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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