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Pex attachment distances and insulation - plumbing question

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Pex attachment distances and insulation - plumbing question

Old 11-15-2015, 04:02 AM
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Default Pex attachment distances and insulation - plumbing question

how far apart can the supports for 3/4 inch size pex piping be located, for a hot water output line from a water heater? Pex will run under house in a crawl space, for 20 ft, probably be attached to the bottom of the floor joists which are 2x 10s-----
I want to be able to insulate the water line with the the type split foam slip on insulation. to do that the pex needs to not run tight up against the joists - the pex crosses the joist bottoms at a 90 degree angle. so how far apart can the supports be, allowing the pex to run just below the joists, leaving room for the insulation?
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Old 11-15-2015, 04:30 AM
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I know SC isn't the north east but it still gets pretty cold. I would want that insulation wrapped around the entire line. It may be better to build a tray underneath the line that would support the pex and insulation. I have had 3/4" pex freeze inside an exterior wall so the thicker the better.
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Old 11-15-2015, 04:38 AM
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Use straps, plastic or galvanized that fit over the insulation instead of strapping that fits the pipe
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Old 11-15-2015, 05:03 AM
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Do NOT put the pex up tight to the floor joists. It will sound like a herd of mice running through your house every time it heats up/cools down. Pex has a huge amount of expansion when heated up.
Wrap it with foam insulation then strap that to the joists. You'll want to support it every 2 feet or less because it basically turns into cooked spaghetti when hot.
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Old 11-15-2015, 06:30 AM
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Originally Posted by s_ebels View Post
Do NOT put the pex up tight to the floor joists. It will sound like a herd of mice running through your house every time it heats up/cools down. Pex has a huge amount of expansion when heated up.
Wrap it with foam insulation then strap that to the joists. You'll want to support it every 2 feet or less because it basically turns into cooked spaghetti when hot.

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Old 11-15-2015, 08:26 AM
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Originally Posted by Mine Now View Post
Use straps, plastic or galvanized that fit over the insulation instead of strapping that fits the pipe

This
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Old 11-15-2015, 09:39 AM
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Originally Posted by Mine Now View Post
Use straps, plastic or galvanized that fit over the insulation instead of strapping that fits the pipe
That would be my first choice with one under every joist.
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Old 11-15-2015, 05:20 PM
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Are you using sharkbites or the crimp rings?....
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Old 11-15-2015, 06:23 PM
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crimp is planned
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