With a good map, you can envision the best spots for new fixtures and plan new pipe routes more efficiently. Maps also help in emergencies, when you need to locate burst or leaking pipes quickly.
Draw a plumbing map for each floor on tracing paper, so you can overlay floors and still read the information below. Make your drawings to scale and have all plumbing fixtures marked. Fixture templates and tracing paper are available at drafting supply stores.
Snoop around your basement for clues about the locations of supply, drain, vent, and gas pipes in your walls.
Use standard plumbing symbols on your map to identify the components of your plumbing system. These symbols will help you and your building inspector follow connections and transitions more easily.
Draw a floorplan for the basement. The drawing should be scaled, legible, and accurate. Note the plumbing features using the symbols on the previous page.
Draw the first floor on a separate piece of transparent drafting paper, using the same scale that you used for the basement. Draw separate floorplans for any additional floors.
Overlay upper-floor diagrams onto the first-floor map, and mark the location of pipes—generally they will extend directly up from fixtures below. If first-story and second-story fixtures
are not closely aligned, the supply pipes follow an offset route in wall or floor cavities. By overlaying the maps, you can see the relation and distance between fixtures and accurately
estimate pipe routes.
Option: Use floor plans of your house to create your plumbing map. Convert the general outlines for each story to tracing paper. The walls can be drawn larger than scale to fit all
the plumbing symbols you will map, but keep overall room dimensions and plumbing fixtures to scale. Be sure to make diagrams for basements and attic spaces as well.
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