What plumbing is needed for a shower?

A shower installation requires several key plumbing components: water supply lines (hot and cold), a mixing valve, shower head and arm, and a drain system with proper slope for drainage.

The water supply system starts with 1/2-inch copper or PEX supply lines running from your home's main water system to the shower location. You'll need both hot and cold water lines that connect to a mixing valve (also called a shower valve or faucet body). This valve controls water temperature and flow, and must be installed at the proper height - typically 48 inches from the finished floor to the center of the valve. The valve connects to a shower arm and head, which should be positioned about 80 inches above the floor.

The drainage system is equally critical and includes a shower drain connected to a P-trap, which prevents sewer gases from entering your home. The drain line must have proper slope (typically 1/4 inch per foot) to ensure water flows efficiently to your main drain system. A shower pan or base sits above this drain system and must be properly waterproofed to prevent leaks into the structure below.

Ottawa Building Code requirements mandate that shower installations need permits, and the rough-in plumbing must be inspected before walls are closed up. The mixing valve must be pressure-balanced or thermostatic to prevent scalding - this is required by Ontario Building Code. Proper venting is also required for the drain system to function correctly.

Professional installation is strongly recommended because improper waterproofing or drain slope can lead to expensive water damage. The rough-in plumbing must be completed before tiling or finishing work begins. For a complete shower installation including plumbing rough-in, expect costs between $800-$2,000 depending on fixture quality and complexity.

For a free estimate on your shower plumbing project, request a quote from Ottawa Pro Plumbing - we handle all permits and ensure code-compliant installation.