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 Water Supply Line Routing for 2nd floor master bath
Author: bmusgrove (TX)

This is just a post out of curiosity. Please note that when I say Right or Left in this, I am referring to right or left while looking at the front of the house.


I have a 2 story house. The 2nd floor has a master bath and Full guest bath. Bath room arrangement is Left Side of the House - master bath - Master Closet - guest Bath - Hallway - bedrooms - right side of the house. All of these back onto a walk in half attic.

The hot water heater sits in a garage closet directly beneath the Master Closet. Now my questions: Hot water is routed from the heater, into a interior wall down into the slab. From there it splits. For the guest bath it moves to the right 10 feet, goes up a interior wall cavity into the half attic for 3 feet and into the Guest bathroom. The master bath is routed into the slab, 25 feet to the left, up a EXTERIOR wall and then into the half attic and then into the master bath.

What is the design philosophy behind using a exterior wall? To this amateur it would make more sense to duplicate the guest bath setup. Run it up a interior wall to the attic go left 3 feet and into the master bath. In fact it could go up the same interior wall as the 1st floor clothes washer which is directly beneath the master bath,

I am in Dallas Texas. Freezing colds temperatures occur maybe 14 intermittent days a year.

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 Re: Water Supply Line Routing for 2nd floor master bath
Author: KCRoto (MO)

Considering the importance of insulation in the exterior wall cavities, the amount of penetrations in various possible instances (such as a satellite dish) etc. it doesn't make any sense to me. The only reasonable rationale that I can see is that the home was designed to be a one story and someone changed the plans after the lines were already set into the foundation when it was poured.

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