Sewer lines on exterior wall

[Gary Mohel]

Is it proper to run sewer lines on the exterior wall of a house? This was done as part of a laundry addition at an older home.

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[Jerry Peck]

Nope. Not where run exposed.

Looks like you are above 'the freeze line', which is basically I-10, so those would need to be protected from freezing by insulation, heat tape, or both.

Besides being protected from physical damage, sunlight, etc.

[Gary Mohel]

Does protection mean building a box around it or painting and insulating it? Thanks.

[Markus Keller]

Don't know about Texas but in these here parts, painting or building a box around it is not considered proper protection.
Based on your question I will guess these are above grade sewer lines. Above grade or exposed no longer allowed here.
I'll defer ... AD where are you ... help the newbie out.

[John Kogel]

Nope. Not where run exposed.

Looks like you are above 'the freeze line', which is basically I-10, so those would need to be protected from freezing by insulation, heat tape, or both.

Besides being protected from physical damage, sunlight, etc.

This is no good then, huh?

[Jerry Peck]

Does protection mean building a box around it or painting and insulating it? Thanks.

It means building a large enough box around it to allow for full exterior wall R-value insulation, and the box suitably strong enough to provide protection from physical damage, as though the box were the exterior wall made to continue out and around the piping.