Pipe Placement 101
Ensure your plumbing connections are in the right spots with this guide to kitchen and bath rough-in.
Synopsis: Plumber Brad Casebier provides this guide to kitchen and bath rough-in, which works with about 80% of the entry-level to mid-level fixtures he and his crew install. For the bathroom, diagrams show rough-in locations for a tub/shower, a vanity sink, a pedestal sink, and a toilet. For the kitchen, rough-in locations are shown for a sink, and a second drawing shows how to place an ice maker. For each room, Casebier provides a list of “gotchas,” or situations you can avoid with a proper rough-in. He also includes guidance and “gotchas” for roughing-in a laundry room. A chart shows specific Uniform Plumbing Code and International Residential Code requirements for securing seven different types of pipe and tubing in both horizontal and vertical spaces. A second chart shows the UPC and IRC requirements for minimum trap size for 14 different fixtures.
As a plumbing contractor, I am responsible for making sure that the water-supply lines and drainpipes are where they are supposed to be when my crew and I show up to set the fixtures. The best way to ensure a correct rough-in is to follow the instructions for each individual fixture specified in the “cut sheets,” or product diagrams. These measured drawings, which show locations for supply and waste lines, are available at manufacturers’ websites and from suppliers that sell the product line.
If you’re working on a relatively basic kitchen or bath, you can use the typical dimensions shown here, which work with 80% or more of the entry-level to mid-level fixtures we install. There are exceptions to these rules, however, especially with high-end products. I always encourage clients to make selections early; I also remind them that any changes later will result in extra charges and that the extras don’t stop with me. A big redo can involve…