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plumbing03.htm Essentials of Plumbing

Unit I: Legends,

INSTALLING PIPING MATERIAL

Roughed-in waste system piping and fittings are installed between and through the building framework. Installation is done before the exposed wall studs and floor joists are covered. Installation at this time makes it easier to rough in pipe runs.

INSTALLING PIPING MATERIAL

 

Installing Pipe Runs through Floor Joists

Cutting joists. Use the following steps:

Use a handsaw to cut a notch in the joist. The notch can be cut at the top or bottom of the joist. The width of the notch should be slightly larger than the pipe's outside diameter. The depth of the notch cannot be larger than one quarter of the joist depth.

Example:  Joist depth
  =  
8 inches
of 8   =   2
Proper notch depth   =   2 inches

Use a sharp wood chisel to cut away any wood between the saw cuts.

Cutting joists.

 

Bracing joists. A joist with a notch cut on top is braced with a 2- by 4-inch board on each side. The boards are nailed in pace and centered under the notch. A joist with a notch cut in the bottom is braced with a steel plate centered on the notch.

Bracing joists.

 

Cutting a joist for a water closet bend. Use the following steps:

  1. Before cutting, make sure there is enough room to install and support a closet bend.
  2. Completely cut out and remove a section of the joist.
  3. Using boards of the same size, called headers, reinforce the joist. Use two headers on each side of the cut.
  4. Install the closet bend.

Cutting a joist for a water closet bend.

 

Installing Pipe Runs Through Wall Studs

Cutting wall studs. Always measure before cutting. Use the following steps:

  1. The notch can be cut from the top or bottom half of the stud. A notch cut from the top cannot be greater than of the depth of the stud. A notch cut from the bottom cannot be greater than 1/3 of the depth of the stud.
  2. Make sure the notch can take the pipe size to be installed.
  3. Cut the notch with a handsaw.

Cutting wall studs.

 

Bracing wall studs. Studs with a notch cut at the top or bottom are braced with steel plates over the center of the notch.

Bracing wall studs.

Most of the content of this course is provided courtesy of US Army Engineer School, Fort Leonard Wood, Missouri

Copyright David L Heiserman
All rights reserved