Plumbing supply and drain lines inevitably have to be installed inside walls to be available at their points of use. The installation is best accomplished during the framing phase of construction, although piping is frequently added later. The most important thing to remember is to place pipes at least an inch from the edges of studs or rafters to avoid screwing into them with drywall screws. Protect them with metal plates attached to the studs when this is not possible.
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Things you need
- Spade bits and hole saws
- Reciprocating saw
- Metal pipe-guard plates
- Pipe strap
- No. 2 Phillips drill bit
Plan the path of water supply lines from the source to the point of use and the route of drain lines from the point of use to the sewer. Remember that drain lines must be installed with a downward slope.
Drill holes in the studs or rafters along the horizontal path of water lines with a spade bit slightly larger than the diameter of the pipe. Drill the holes one-by-one, passing a length of pipe through each to align the position of the hole in the next stud. Remember to drill each hole in the middle of each wooden member, at least an inch from each edge to avoid contacting the pipe with drywall screws.
Make notches in framing with a reciprocating saw for waste pipes to avoid weakening wooden members. Remember to keep an overall downward slope. Set the pipe inside the notches and attach metal pipe-guard plates over the openings.
Make holes for vent and vertical waste lines through top and bottom plates with a hole saw. Use a saw that has a slightly larger diameter than the pipe. In some cases, you may have to make pilot holes with a spade bit and cut the holes out with a reciprocating saw.
Install blocking in the wall and anchor tub and shower diverters to it with pipe strapping. Use strapping to secure all stub-outs for supply and drain lines to a stud. If no stud is available, install blocking and secure the pipe to that.
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