Shower Rough-In Plumbing: A Step-by-Step DIY Guide
About This Project
This project outlines the steps for completing a shower rough-in plumbing installation. First, precisely mark the locations for the showerhead, valve, and drain, using measuring tools and a level. Next, install the water supply lines, connecting PEX lines to the supply stubs with appropriate fittings, ensuring secure connections. Then, thoroughly test for leaks by capping lines and slowly turning on the water supply. Finally, Install the shower drain line, ensuring proper slope and secure connections to the main drain pipe.
Best for experienced DIYers and homeowners with some experience with basic plumbing knowledge and familiarity with power tools.
Tools & Materials
25 ft. Tape Measure
Level
Zest Candle 10 in. Metallic Gold Straight Taper Candles (12-Set) CEZ-105
The Plumber's Choice PEX Tubing Cutter Tool PTCUTN
RIDGID 1/2 in. Close Quarters Manual PEX Crimp Tool 43853
The Plumber's Choice 1 in. x 300 ft. Blue PEX-B Tubing Potable Water Pipe PPWB1300NW
25 ft. Tape Measure
Measure with precision and ease.
Level
Ensures surfaces are just right.
Zest Candle 10 in. Metallic Gold Straight Taper Candles (12-Set) CEZ-105
Taper Candles Great For The Holiday's, and for All Year Round White Taper. Quality Products and Quick Shipping. Taper Candles add elegance and sophistication to any formal event. Whether it be at a wedding,
The Plumber's Choice PEX Tubing Cutter Tool PTCUTN
The PEX shear cutter tool is ideal for cutting tubing for water applications. Its spring-loaded handle opens easily so you can make multiple cuts quickly and accurately. A textured grip lets you hold it securely for safety and speed. The handles are designed to fit your hand for greater comfort. It's compact enough to fit in your pocket so you can always have it on hand when you need it. This tool comes complete with its own carrying case with belt loop.
RIDGID 1/2 in. Close Quarters Manual PEX Crimp Tool 43853
Close Quarters Manual PEX Crimp Tools are the newest addition to the RIDGID Crimp Tool line. With handle openings up to 71% smaller than traditional PEX crimp tools, you can maneuver into tight spaces
The Plumber's Choice 1 in. x 300 ft. Blue PEX-B Tubing Potable Water Pipe PPWB1300NW
Oxygen barrier (EVOH) is a strong and flexible cross-linked polyethylene tubing with superior temperature and pressure ratings. Useful in commercial and residential hydronic radiant heating applications.
Steps
Precisely Mark Shower Plumbing Locations
1 minAccurately mark the showerhead, valve, and drain positions on the wall and floor. Measure and record the showerhead height, hot and cold water supply line locations for the valve, and the drain's center point. Consider using a level for precise vertical measurements.
Watch: Measure and mark
Install the Water Supply Lines
2 minsRun the hot and cold water supply lines to the marked valve locations. Connect the PEX lines to the supply stubs using appropriate fittings. Securely tighten all connections to prevent leaks. Consider using a torque wrench for consistent tightening.
Watch: Connect water supply
Common Problems
Water leaking after installation
Solution: Double-check all connections and follow the installation steps carefully.
Prevention: Carefully inspect all connections for any signs of leakage.
Parts not fitting properly
Solution: Secure the pipes with pipe straps or clamps.
Prevention: Use appropriate fittings and primer/cement for the chosen pipe material.
Frequently Asked Questions
How difficult is this shower rough-in project for a beginner, and what's a realistic time estimate?
While labeled "beginner," this project requires meticulous attention to detail for measurements and connections. A novice can accomplish it, but allocate at least a full weekend, or even longer, to work carefully, learn the process, and handle any unforeseen challenges without rushing.
The tool list includes a "Zest Candle." Is that correct, and are the PEX-specific tools like the crimp tool absolutely necessary?
The "Zest Candle" is an error and is not needed for plumbing. However, specialized PEX tools such as the PEX cutter and a crimp tool are absolutely essential for creating secure, leak-proof connections. You can often rent these specific PEX tools from home improvement stores if you prefer not to purchase them.
What are the most common causes of leaks in PEX supply lines, and how can I ensure my connections are watertight?
Leaks typically stem from improper crimping or damaged tubing. Always make clean, perpendicular cuts with your PEX cutter, ensure fittings are fully seated, and use your crimp tool correctly. Crucially, check every crimped connection with a go/no-go gauge for proper tightness.
How should I thoroughly test the PEX supply lines for leaks before closing up the walls?
After capping all open PEX ends, slowly introduce water pressure to the system. Inspect every connection point visually for drips, listen for any hissing, and feel for moisture. Keep the system pressurized for several hours and re-check periodically to catch any slow leaks before proceeding.
Why is maintaining the correct slope for the shower drain line so important, and what happens if it's wrong?
Proper drain slope, typically 1/4 inch per foot, is vital for gravity to efficiently carry wastewater away and prevent clogs. If the slope is insufficient, water can sit in the pipe, leading to stagnant odors and buildup. Too much slope can also cause water to run faster than solids, leading to blockages.
Why is PEX-B tubing recommended for this project, and are there better alternatives for a DIYer?
PEX-B is an excellent choice for DIY shower rough-ins due to its flexibility, cost-effectiveness, and ease of installation without the need for soldering. While copper is a traditional alternative, PEX-B often simplifies the process for beginners, requiring fewer specialized skills and less time for installation.
