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Old 09-20-2013, 09:21 AM   #1
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foam sealant around pipes?


In the closet where the hot and cold copper supply pipes come in to meet the water heater, the plumber knocked out two big holes roughly 4" in diameter each. I'd like to patch them back but hard to use joint compound as it just fall into the wall cavity.

Normally I would use some wood backing but pipes are in the way. Can I use those "GREAT STUFF" foam sealant for this? Not sure if those may be flammable around hot water pipes.

If not my last resort is lots of newspapers until I can some resistance to my putty knife.

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Old 09-20-2013, 11:40 AM   #2
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foam sealant around pipes?


I would be very tempted to use the great stuff foam that is fire rated. Ceartainly I would not use newspapers given your stated concern about flammability. Many times, the structure acts as a fire block, and holes can compromise that capability. Fill the holes with something that can block the spread of flame for the rated period of time.

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Old 09-20-2013, 12:47 PM   #3
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foam sealant around pipes?


Take 2 1x2 pieces of scrap wood long enough to span the hole plus a few inches. Slip into the hole on each side of the pipe, secure with drywall screws thru the front of the wall. Cut a patch to roughly fit the hole, drill the hole for the pipe and cut the patch in half. Install the patch, screwing to the wood scraps you installed. Does not have to be perfect. Tape and mud.
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Old 09-20-2013, 02:26 PM   #4
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foam sealant around pipes?


duplicate.

Last edited by miamicuse; 09-21-2013 at 12:09 AM.
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Old 09-20-2013, 02:26 PM   #5
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foam sealant around pipes?


That's what I normally do to use wood from behind secured with screws from front.

In this case holes are irregular and wood wouldn't fit through and pipe in the way anyways. Going try some crumpled chicken wire stuff through the hole to mud over and see.
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Old 09-20-2013, 07:33 PM   #6
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foam sealant around pipes?


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Originally Posted by miamicuse View Post
That's what I normally do to use wood from behind secured with screws from front.

In this case holes are irregular and wood wouldn't fit through and pipe in the way anyways. Going try some crumpled chicken wire stuff through the hole to mud over and see.
Open the hole up and square it off.
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Old 09-21-2013, 05:13 AM   #7
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foam sealant around pipes?


hot water pipes don't get hot enough to start anything on fire.
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Old 09-21-2013, 07:21 AM   #8
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foam sealant around pipes?


Come on-chicken wire and newspaper??? Cut it square, a couple pieces of 1x and fix it right.
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Old 09-21-2013, 08:28 AM   #9
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foam sealant around pipes?


I have fixed some pretty big holes by using spray foam. Over fill the void then go find something else to do for a few days. Once it is good and cured you can shave it down to just below the wall surface then mud away.
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Old 09-21-2013, 10:27 AM   #10
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foam sealant around pipes?


some insects are attracted to newspaper, cardboard, etc.

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