I’ve been researching PEX, as this will be my first time using it. I am seeing conflicting information about running through wood studs. Most sources say to drill a larger hole to allow expansion room (something like 3/4” or 7/8” for 1/2 PEX) and that no abrasion clips are necessary. I saw a YouTube video from PEX Universe, and they say that the extra hole space isn’t good and to use an abrasion clip securely around the PEX. They indicate that it’s not advisable for the pipe to rub against the wood. Wouldn’t a tight abrasion clip make it difficult for the pipe to expand? I also have seen some people say that they use foam sealant or some other filler. I’m so confused and any help/advice would be greatly appreciated!

This is the video that I saw:
https://m.youtube.com/watch?v=E4pK0P7F2KQ

 

Before I retired as an architect, every specification section that I wrote had the standard "Follow manufacturer's instructions and recommendations". And if there was a problem with a material on a jobsite, one of the first things we looked at was whether it was installed per manufacturer's instructions. Bottom line is that I would suggest calling Pex's tech support and ask what they recommend.

 

From PEX pro installation.....

PEX expands and contracts with changes in temperature, which causes the pipes to move back and forth. Several years of even the slightest movement can wear a hole in PEX pipes, especially if they’re rubbing against something abrasive. If your pipe is in contact with a joist, duct, electrical box or steel stud, or it is passing through a block wall or concrete slab, it needs to be protected. You can protect your pipe with abrasion clips, cover the pipe with inexpensive pipe insulation, or enclose it within a larger pipe. Pipes that are encased in concrete (for in-floor heating, for example) are OK because the concrete holds them in place. And pipes running straight through wood studs and joists are fine too—just protect the pipe in areas where it bends as it passes through.