Run Water Supply Lines — Run PEX Water Supply Lines
Part of project
How to Rough-In Plumbing for a Bathroom Vanity · Step 4 of 5
In this video
Run new PEX water lines for the hot and cold supply to each fixture. This includes lines for the tub/shower valve, the toilet, and the vanity sink. Secure the lines to the wood framing using appropriate clips or straps. Install solid wood backing between the studs where the water lines will exit the wall to provide a sturdy mounting surface for shut-off valves (angle stops). Stub out the PEX pipes at the correct heights for each fixture.
Goal: Provide hot and cold water to all new bathroom fixtures.
- Typical height for vanity water stubs is around 24 inches from the floor, but always confirm with the specific vanity being used.
Used in this video
- PEX Crimping Tool (Tool Type: Plumbing Tools) — Securing PEX fittings to the PEX tubing.
- PEX Pipe Cutter (Tool Type: Plumbing Tools, Power Source: Manual) — Making clean, straight cuts on PEX tubing.
- Drill (Tool Type: Power Tools) — Drilling holes in studs to run pipes and securing backing.
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FAQs
As an "intermediate" project, how challenging is roughing in plumbing for someone with limited prior plumbing experience?
While intermediate, this project requires precision for proper drain slope, watertight PEX connections, and adherence to plumbing codes. Take your time, double-check all measurements and connections, and be prepared to consult diagrams and local regulations. Mistakes in plumbing can be very costly to fix later.
Do I need all the specialized tools listed, like the PEX crimp tool and specific tubing cutters, or are there more budget-friendly alternatives?
Specialized PEX tools are highly recommended for reliable, leak-free connections that meet code. While some PEX systems offer push-to-connect fittings, traditional crimping or expansion tools provide a more robust rough-in. Renting expensive tools like PEX crimpers can be a cost-effective alternative for a one-time project.
Is it always necessary to get a permit and have an inspection for new plumbing rough-in work like this bathroom vanity?
Yes, new plumbing installations almost always require permits and inspections to ensure safety and compliance with local building codes. Failing to obtain permits can lead to costly rework, fines, or issues when selling your home. Always check with your local building department before starting any plumbing work.
What are the most common mistakes DIYers make during a plumbing rough-in, and how can I avoid them, especially regarding leaks?
Common mistakes include improper drain slope leading to clogs, poorly sealed DWV joints, and incorrect PEX connections causing leaks. To avoid these, ensure all PVC joints are dry-fitted and then properly cemented, and that PEX connections are correctly crimped/expanded and burr-free. Always pressure-test the system thoroughly before closing the wall.
Run Water Supply Lines — Run PEX Water Supply Lines
Part of project
How to Rough-In Plumbing for a Bathroom Vanity · Step 4 of 5
In this video
Run new PEX water lines for the hot and cold supply to each fixture. This includes lines for the tub/shower valve, the toilet, and the vanity sink. Secure the lines to the wood framing using appropriate clips or straps. Install solid wood backing between the studs where the water lines will exit the wall to provide a sturdy mounting surface for shut-off valves (angle stops). Stub out the PEX pipes at the correct heights for each fixture.
Goal: Provide hot and cold water to all new bathroom fixtures.
- Typical height for vanity water stubs is around 24 inches from the floor, but always confirm with the specific vanity being used.
Used in this video
- PEX Crimping Tool (Tool Type: Plumbing Tools) — Securing PEX fittings to the PEX tubing.
- PEX Pipe Cutter (Tool Type: Plumbing Tools, Power Source: Manual) — Making clean, straight cuts on PEX tubing.
- Drill (Tool Type: Power Tools) — Drilling holes in studs to run pipes and securing backing.
Frequently Asked Questions
As an "intermediate" project, how challenging is roughing in plumbing for someone with limited prior plumbing experience?
While intermediate, this project requires precision for proper drain slope, watertight PEX connections, and adherence to plumbing codes. Take your time, double-check all measurements and connections, and be prepared to consult diagrams and local regulations. Mistakes in plumbing can be very costly to fix later.
Do I need all the specialized tools listed, like the PEX crimp tool and specific tubing cutters, or are there more budget-friendly alternatives?
Specialized PEX tools are highly recommended for reliable, leak-free connections that meet code. While some PEX systems offer push-to-connect fittings, traditional crimping or expansion tools provide a more robust rough-in. Renting expensive tools like PEX crimpers can be a cost-effective alternative for a one-time project.
Is it always necessary to get a permit and have an inspection for new plumbing rough-in work like this bathroom vanity?
Yes, new plumbing installations almost always require permits and inspections to ensure safety and compliance with local building codes. Failing to obtain permits can lead to costly rework, fines, or issues when selling your home. Always check with your local building department before starting any plumbing work.
What are the most common mistakes DIYers make during a plumbing rough-in, and how can I avoid them, especially regarding leaks?
Common mistakes include improper drain slope leading to clogs, poorly sealed DWV joints, and incorrect PEX connections causing leaks. To avoid these, ensure all PVC joints are dry-fitted and then properly cemented, and that PEX connections are correctly crimped/expanded and burr-free. Always pressure-test the system thoroughly before closing the wall.