Install New PEX Tubing — Run PEX Water Supply Lines
Part of project
How to Rough-In Plumbing for a Bathroom Vanity · Step 4 of 5
In this video
Install new PEX tubing for both the hot (red) and cold (blue) water lines. Cut the PEX tubing to the appropriate length. Use proper PEX fittings, like the 90-degree elbow shown, to connect the new tubing to the main water supply lines. Secure each connection using a PEX crimp ring and a PEX crimping tool to ensure a tight, leak-proof seal. Run the new lines up to the sink faucet connections.
Goal: Install new plumbing lines
- Use blue PEX for cold water and red PEX for hot water to maintain standard plumbing color codes, making future work easier.
Used in this video
- PEX Crimping Tool — Compressing the PEX crimp rings to secure the fittings onto the tubing.
- Tape Measure — Measuring the required length for the new PEX tubing sections.
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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.
Install New PEX Tubing — Run PEX Water Supply Lines
Part of project
How to Rough-In Plumbing for a Bathroom Vanity · Step 4 of 5
In this video
Install new PEX tubing for both the hot (red) and cold (blue) water lines. Cut the PEX tubing to the appropriate length. Use proper PEX fittings, like the 90-degree elbow shown, to connect the new tubing to the main water supply lines. Secure each connection using a PEX crimp ring and a PEX crimping tool to ensure a tight, leak-proof seal. Run the new lines up to the sink faucet connections.
Goal: Install new plumbing lines
- Use blue PEX for cold water and red PEX for hot water to maintain standard plumbing color codes, making future work easier.
Used in this video
- PEX Crimping Tool — Compressing the PEX crimp rings to secure the fittings onto the tubing.
- Tape Measure — Measuring the required length for the new PEX tubing sections.
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.