Complete plumbing redo question

[Tom P]

I gutted a main bathroom in my 1949 house. I then found out it is now time to do a complete re-do of the pressure side of the galvanized plumbing of the whole house. Some of my questions where I need help in are: I am going to use 1/2 copper piping to feed the bathroom sink, it comes up through the floor. The old galvanized pipe is a 1/2, which has a hole size more like the size of a 3/4 copper tubing. I can only use 1/2 flex copper tubing to make it around a hidden joist to make this work. There is no room to solder or get in to use a tool to use a copper cast fitting with threads. What I am asking is: I need to stop pipe rattle that could happen when the 1/2 copper is going through the 3/4 inch hole, so my idea is to use " foam in a can " to take up the gap in the hole. Is there a better way ??? I hate to find out later that there is a better was to stop the rattle through that hole. I will be using a hard mount 1/2 90 deg. cast fitting to bolt it to a 2X4 as it comes out of the wall under the vanity. Next question. I did not have any hammering before with the galvanized tubing. But copper my be different. ( I am planning ahead and building that issue into the system so I don't have to deal with it later. I am thinking of using some anti-hammering small tubes made for this purpose. They sell them at Menards. These tubes do not have a blatter in them. Logically I would think these can only can be used vertically, so I will have to use the small ones under the floor joists. I only plan on using 2-3 in the system. ( I do know you are suppose to use these right at the problem source but something is better then none.) Question: Am I right in pre planning for this?? It is so easy now to put a couple of these in. I have read a couple of plumbing books but they never tell you all you need to know. I know some of you have done this to your houses. There may be something that you learned that a first time complete re-doer like me has over looked. ANY help or comments that would help would be appreciated.

[gonfishn95]

e-mail me and i'll answer
gonfishn95@aol.com
larry

[REW]

Send me an E-mail, and I will answer your questions.
hflier@aol.com

Take care
REW

[Ryno]

Tom, I don't know much about plumbing, but one thing I would do while I have the area opened up would be to ckeck the stringers in the rafters. It seems that the 1949 models were a little week and, while they showed no immediate failure, it now appears that afer 53 years, they can somehow become separated. Something about shifting of the ground and high horsepower causes cracks! Go figure.
Sorry Tom, I could not resist the opportunity to make light of your previous posts on the Yarcraft trasoms. I happen to have one too. Now it would not be a light topic if one actually did fail and cause harm. Good luck with your project.
Ryno

[Tom P]

You know, it was time to bring it up again. So I did. ;)

[IaDave]

In our area they are allowing a flexible plastic tube for potable water called PEX or Aquapex. It is basically a crimp type application. I'm not sure if Home Depot or Menards carries it. I know that local plumbing wholesalers would carry it.