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Plumbing Supply Distribution Lines Not Located Horizontally in Exterior Wall Cavity

Plumbing Supply Distribution Lines Not Located Horizontally in Exterior Wall Cavity

Intent

Reduce the potential for condensation on supply pipes by keeping pipes in conditioned space (where pipes are not exposed to large temperature and humidity differentials). Also reduces the consequences of a potential plumbing leak—which could lead to wetting of structural members, insulation, and interior finishes.

Additional Information/How to Implement

Try to cluster bathrooms and other hot water uses, e.g., “stacked” bathrooms, to minimize the need for running supply lines on exterior walls. Water supply lines can be run through duct chases (designed for keeping ducts in conditioned space). When piping must be located in exterior walls, insulation should be placed between the exterior sheathing and the pipe, but not between the pipe and the interior wall (to prevent freezing).

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