Under Floor Staple Up Fasteners

ecurbjk

Hi All,

I have a question regarding under floor staple up pex with aluminum heat transfer plates.

I've read a good number of very helpful posts on here and I know that pex tubing expands when hot water is circulating through it. My question is related to pex fasteners. In my case, I'm fastening the pex just under the floor joist on one end of the room, I've attached a couple of pictures.

Would there be any concerns with this type of installation with regards to expansion? I know most installations go through the floor joist with very little or no fasteners. Will these fasteners or the way I have the end loops fastened prevent the pex tubing from expanding as needed? I'm not experienced with plumbing and learning as I go.

Any tips or pointers is appreciated!

Thanks
Bruce.

Ironman

May I ask why you didn’t drill the joists and run the tubing through them?

We never staple or strap the tubing in the middle of the radius of the bend in order to allow for expansion there.

ecurbjk

Hi Bob,

The new interior wall that will go up around the room in the basement will have plenty of space from the concrete wall and I thought it would be easier to attach the pex to the wall rather than drilling holes in all the joists and running pex through them.

So far the installation seems easy but I wanted to get some feedback from folks that have more experience with this.

Would it be sufficient to just remove fasteners from the middle of the radius of the bend?

Thanks

Bruce

HomerJSmith

That'll work. You want to take care that the pex doesn't rub at an angle against the end of the plates and abrades as the pex expands and contracts.

hot_rod

try not to have the pex touching the wood on the loop ends, it will make some noise. Let the loop ends float, no fasteners