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Luke1

New Member

1

Wednesday, July 25th 2012, 1:31am

3/4" PEX or 1" PEX

Hello,

Should I use 1" PEX or 3/4" PEX from my main in the basement to outside?

Wet_Boots

Supreme Member

Posts: 3,878

Location: Metro NYC

2

Wednesday, July 25th 2012, 7:49am

You can't run PEX through an exterior wall, unless it's below grade with a sleeve. I transition to copper, and use all copper and brass for the exterior above-ground plumbing.

3

Wednesday, July 25th 2012, 8:10am

Boots,
Is that a code thing or a function thing?

Luke1

New Member

4

Wednesday, July 25th 2012, 10:06am

Should I go with 1" or 3/4" inside the house?

Wet_Boots

Supreme Member

Posts: 3,878

Location: Metro NYC

5

Wednesday, July 25th 2012, 10:21am

Boots,
Is that a code thing or a function thing?
It follows from the codes, because the backflow preventer is above ground next to the house. It needs the support from copper through the wall, and upstream of the PVB or RPZ (sometimes there is a transition to PVC right after the backflow preventer)

PEX is never approved for outdoor above-ground use - maybe it's a sunlight concern

As for indoor plumbing, there is little reason to not transition to one-inch as soon as possible in a supply run, if you have the slightest question in the matter.

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