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This section focuses on installing rigid copper water pipe: It’s strong, easily worked, approved by virtually all codes, and represents nearly 90 percent of residential installations. That noted, you should also consider reading about PEX flexible tubing on p. 279.

Fittings

If you divide fittings into a few categories, their many names start to make sense. Because they do similar things, supply-pipe and DWV fittings often share names.

Fittings join pipes. The simplest fitting is a cou­pling, which joins two straight lengths of pipe. A reducing coupling joins different size pipes. A repair coupling has no internal stop midway, so it can slide all the way onto a pipe, then slide back over a new piece of pipe inserted to repair a dam­aged section. A union is a coupling you can disconnect.

If you’ll be adding or moving fixtures, you’ll need to install pipes, and that will require permits and planning. Start by assessing the condition of existing pipes (see Chapter 1), which you can connect to if they are in good shape. Create a scale drawing of proposed changes, assemble a materials list, and then ask a plumbing-supply store clerk or a plumber to review both. If you’re well organized, clerks at supply stores will usually be glad to help. However, if you need help understanding your existing system, hire a plumber to assess your system. He or she can also explain how to apply for a permit and which inspections will be required.

IS THERE ENOUGH ROOM?

If you’re adding a bathroom, first consider the overall size of the room...