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hose pex piping- how support insulated

Old 05-19-2019, 08:01 AM
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Default hose pex piping- how support insulated

title should be HOUSE pix piping- sorry, cant edit it

home crawl space question. for hot water lines that are to be insulated
most supports I see for pex pipe show pix of the uninsulated pex or copper pipe held to a floor joist by a nail on or screw on clip of some kind.
My question, what do you do when the pex pipe has split foam or rubber insulation tube around it?

How do you hold this to the joist?

Last edited by edwardh1; 05-20-2019 at 05:16 AM.
Old 05-19-2019, 08:18 AM
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Much larger two hole straps. Some use plastic straps made for plumbing or electrical conduit. Others use two hole metal straps (often galvanized or plain steel) that fit around the insulation. Just a guess here, but I'm thinking about 1-1/4" strap for 1/2" insulated pex and 1-1/2" strap for 3/4" insulated pex. Much better to use screws to fasten the hangers to the bottom of the joists instead of nails. Hardware or big box stores will have them in hte electrical and plumbing aisles.
Old 05-19-2019, 08:19 AM
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If the pex is already installed you would scarf out the insulation around the joist, if your installing new and don't want to break the insulation use something like these A-bands large enough to fit around the OD of the insulation.

Old 05-19-2019, 08:19 AM
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Peel the split foam or rubber insulation back and use the correct support then put the insulation back over the brkt
Old 05-19-2019, 08:22 AM
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I would not suggest peeling back the pipe insulation. Better to leave it intact and reduce the risk of the condensation forming on the outside of the pex.
Old 05-19-2019, 08:23 AM
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Originally Posted by Thalasso View Post
Peel the split foam or rubber insulation back and use the correct support then put the insulation back over the brkt
This would be my approach.
Old 05-19-2019, 08:25 AM
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Just slice insulation with a utility knife and use a standard talon/strap. The loss at that strap point is minimal. If that exact point is freezing you have bigger crawlspace issues. Suggest insulating foundation, closing vents, heat tapes, etc.
or just use a bigger strap. Most insulation is 1/2" wall.
Old 05-19-2019, 08:37 AM
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Here is the concept of what we do in the perfect world in boler rooms. In a residentrial crawl space (and the pex is already insulated), I would use a two hole strap on every joist that fits around the pipe insulation. Try not to crush the insulation as it loses insulating properties when you crush it.
Old 05-19-2019, 08:51 AM
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Just use some plastic plumbers strapping.
Old 05-19-2019, 08:55 AM
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Originally Posted by Tuna Man View Post
Here is the concept of what we do in the perfect world in boler rooms. In a residentrial crawl space (and the pex is already insulated), I would use a two hole strap on every joist that fits around the pipe insulation. Try not to crush the insulation as it loses insulating properties when you crush it.
In a commercial world or high rise the above method absolutely gets used......double thumbs up.

Old 05-19-2019, 08:58 AM
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Copper straps- 1 1/2" for 1/2" pipe and 1 3/4" for 3/4" insulated pipe I believe. Did this with insulated copper pipe back in the day should work for Pex
Old 05-19-2019, 09:12 AM
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You can find a size that fits over the insulation
Old 05-19-2019, 09:28 AM
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Originally Posted by lugoismad View Post
Just use some plastic plumbers strapping.
​​​​​​
This^^^ This is exactly what its for. Go to the big box store and grab a roll of strap and hang the pex. Some of you way over complicate shit trying to look smart.
Old 05-19-2019, 09:47 AM
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Originally Posted by nautiduck View Post
​​​​​​
This^^^ This is exactly what its for. Go to the big box store and grab a roll of strap and hang the pex. Some of you way over complicate shit trying to look smart.
No, we did things in a way that would help us get paid for a job, would appease the inspector and last longer than it needed it to. For the homeowner it probably isn't necessary. I used that method I mentioned all over my house where it was needed. Strapping or band iron looks like sh*T
Old 05-19-2019, 09:51 AM
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Originally Posted by Mine Now View Post
No, we did things in a way that would help us get paid for a job, would appease the inspector and last longer than it needed it to. For the homeowner it probably isn't necessary. I used that method I mentioned all over my house where it was needed. Strapping or band iron looks like sh*T

The plastic strapping works fine. Used in New construction here on the beach. Better than copper with the salt.
Old 05-19-2019, 09:55 AM
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Originally Posted by Mine Now View Post
Why do you even need the foam insulation wrap, it's copper to copper?

Old 05-19-2019, 09:58 AM
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Originally Posted by Garett View Post
Why do you even need the foam insulation wrap, it's copper to copper?
heat pipe , no noise from expansion/ contraction
Old 05-19-2019, 10:01 AM
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Originally Posted by 4/0 View Post
The plastic strapping works fine. Used in New construction here on the beach. Better than copper with the salt.
If your inspectors are o.k. with it. Ive been out of plumbing a long time so I don't know what the norm is anymore.




Old 05-19-2019, 10:39 AM
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I'm retired now. Had a leg go bad on me. The plastic is all that is used here. Inspectors do not have a problem with it.

But things are regional. Going to be different up north than it will be here in the south. Different weather, lack of freezing etc.

When I was building I had one plumbing inspector who would be mad on every job because I always put my ice maker cutoffs under the sink with labels. I've seen to much damage from from bad ice makers and homeowners not being able to pull the refrigerator out to shut off the water once they leveled up on their legs to get to that cutoff box.


Oatly plastic pipe strap.

https://www.supplyhouse.com/Oatey-33...RoCHvAQAvD_BwE
Old 05-19-2019, 07:23 PM
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The reason pex is covered with insulation is that pex is not UV resistant. If left exposed in sunlight it will fail in 6 month. Even pex UV is only rated for 2 years

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