Hi all,
An installer is currently installing some foam-enclosed copper tubing for my split type aircon. But, I noticed that they punch an irregular hole through the CHB, put the foam-enclosed copper tube through... and that's it. They then just plan to cover this up with the wall finishing material. Some questions:
1) I've asked them to house the copper tube in a PVC pipe whenever it goes through the wall, and to plaster it up so that there is no space between the wall and the PVC pipe. I had assumed this should be standard practice - but I guess not? How common is this?
2) For the interior of the PVC pipe, there is still a little bit of air space between the PVC pipe and the foam-enclosed copper tube instead. I want to cover that up so that it's sealed. Would it make sense for me to inject PU foam (or something like that) so that there is very minimal air space left? If so, where do I get that injector?
Thanks.
Re: Aircon piping
1) Correct.
2) I'd probably just find some scrap closed-cell foam (the sort that
OEM's wrap motherboards and other bnew electronics with), cut
it to size, and wedge it into the gap, basically wrapping it around
the insulation, but inside the PVC conduit. Paint to match.
Re: Aircon piping
1.that is correct sir,
2. for me ill just put on some sealant inside the pvc after the piping was finished, before covering it up,you can buy this at all D.I.Y. store specially the mildew resistance type and if your lucky you can find those foam cartridges that your looking for just dont forget the sealant gun !thanks hope this help!
Re: Aircon piping
You can also try to use an expanding foam product. They are normally sold in pressurized can similar to a canned spray paint and it comes with a small plastic tube for hard to reach area. Just shake it for a few minutes and using the plastic tube attachement, spray it around the gap somewhere in the middle of the area you want to seal. You only need a little amount as the foam really expands a lot when its expose to air. After an hour, once the foam hardens (color is like dark yellow), use a cutting knife to remove the excess foam that protruded from the gap, and a sandpaper to level it with the edges of the tube.
Buy the smallest can that you can find as I don't think you'll be using much and you can't keep any excess for a long time.
I use this expanding foam to pack fragile items in a box. Just wrap the item in plastic or pallete film, put it in the middle of the box, and spray both ends with the foam - use scrap cardboard to minimize the size of the mold your making.
Boo
