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n0c7 01-15-2012 02:47 PM

Plumbing runs on basement outside wall
 
I want to run hot and cold PEX lines down a 2x4(wood) batt insulated "outside" basement wall to where my builder has roughed in a sink drain. I know that running plumbing in exterior walls above grade is usually not allowed but does this apply to the basement? If I'm allowed, what precautions do I need to take?

I live in a winter climate that gets very warm in the summer to sometimes arctic cold in the winter.

joecaption 01-15-2012 03:05 PM

Very bad idea, They should be if at all possible run down the center of the crawlspace and in your area I'd also insulate them with foam tubes.

n0c7 01-15-2012 03:18 PM

Sorry when I said outside wall I didn't actually mean outside. It's on the interior of the house foundation walls.

joecaption 01-15-2012 03:27 PM

Where are yu most likly to get air leaks in a crawl space?
Any cracks, gaps under the foundation plate, any vents. Moving cold air is what's going to freeze those pipes.

TheEplumber 01-15-2012 04:13 PM

When you drop into the wall, stay to the warm side of the insulation- against the drywall. Be sure the rim joist is insulated well.

n0c7 01-15-2012 06:04 PM

Quote:

Originally Posted by TheEplumber (Post 823534)
When you drop into the wall, stay to the warm side of the insulation- against the drywall. Be sure the rim joist is insulated well.

Here's a pic of what I'm working with:

http://i62.photobucket.com/albums/h82/n0c7/photo-3.jpg

Should the pipes be behind the vapor barrier or in front?

joecaption 01-15-2012 06:25 PM

In front

n0c7 01-15-2012 06:42 PM

Quote:

Originally Posted by joecaption
In front

Now that you've seen a picture - were we talking about two different scenarios?

n0c7 01-19-2012 06:22 PM

Local authority says in front of the vapor barrier but behind the drywall. Not sure how you clamp it down like this but hey.


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