Mounting the Valve Assembly — Run Water Supply Lines
Part of project
How to Rough-In Plumbing for a Basement Bathroom · Step 6 of 7
In this video
After the assembly has cooled, re-install the valve cartridge and stops. Carefully place the entire soldered assembly into the wall framing. Center the valve over the tub drain and use a level to ensure it is perfectly plumb. Secure the valve body to the wood blocking using screws through its mounting holes. Also, secure the drop elbow for the shower arm to its respective blocking. Then, drill holes through the studs as needed to route the PEX supply lines.
Goal: Securely install the plumbing in the wall
- Temporarily placing the assembly against the wall before final installation can help confirm that all your pipe lengths and angles are correct.
Used in this video
- Drill/Driver (Tool Type: Drill Type, Power Source: Battery, brand: DeWalt) — Driving screws to secure the valve and drop elbow, and for drilling holes for PEX tubing.
- Level (Tool Type: Measuring Tools, Power Source: Manual) — Ensuring the valve assembly is installed perfectly plumb.
- Tape Measure (Tool Type: Measuring Tools, Power Source: Manual) — Verifying the centered position of the valve.
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FAQs
How difficult is roughing in basement bathroom plumbing for a DIYer, and how long does it typically take?
This project is rated intermediate due to the need for precise measurements, concrete work, and understanding plumbing codes. For an experienced DIYer, it can take 3-5 full days of work, not including permit acquisition and inspection wait times. Beginners should consider professional help for critical steps like concrete cutting and main line tie-ins.
What permits do I need, and how do I ensure my rough-in plumbing passes inspection?
You will almost certainly need a plumbing permit and possibly a building permit. Contact your local building department early in the planning phase to understand all requirements, necessary inspections (like the rough-in inspection), and specific code regulations for pipe sizing, slope, and venting to avoid costly rework.
What's the best way to break up the concrete floor, and what safety precautions should I take?
A demolition hammer or electric jackhammer is highly recommended for efficiency, which can often be rented. Wear heavy-duty work gloves, steel-toed boots, eye protection, hearing protection, and a dust mask to protect against concrete dust and flying debris. Be mindful of existing utility lines marked during the planning phase.
What are the most common mistakes when installing the underground DWV pipes, and how can I avoid them?
Common mistakes include incorrect pipe slope, inadequate solvent welding, and insufficient depth for drain lines. Ensure a consistent slope of at least 1/4 inch per foot for proper drainage, use proper primer and cement for strong, leak-free joints, and confirm all pipes are securely bedded in gravel to prevent shifting.
Mounting the Valve Assembly — Run Water Supply Lines
Part of project
How to Rough-In Plumbing for a Basement Bathroom · Step 6 of 7
In this video
After the assembly has cooled, re-install the valve cartridge and stops. Carefully place the entire soldered assembly into the wall framing. Center the valve over the tub drain and use a level to ensure it is perfectly plumb. Secure the valve body to the wood blocking using screws through its mounting holes. Also, secure the drop elbow for the shower arm to its respective blocking. Then, drill holes through the studs as needed to route the PEX supply lines.
Goal: Securely install the plumbing in the wall
- Temporarily placing the assembly against the wall before final installation can help confirm that all your pipe lengths and angles are correct.
Used in this video
- Drill/Driver (Tool Type: Drill Type, Power Source: Battery, brand: DeWalt) — Driving screws to secure the valve and drop elbow, and for drilling holes for PEX tubing.
- Level (Tool Type: Measuring Tools, Power Source: Manual) — Ensuring the valve assembly is installed perfectly plumb.
- Tape Measure (Tool Type: Measuring Tools, Power Source: Manual) — Verifying the centered position of the valve.
Frequently Asked Questions
How difficult is roughing in basement bathroom plumbing for a DIYer, and how long does it typically take?
This project is rated intermediate due to the need for precise measurements, concrete work, and understanding plumbing codes. For an experienced DIYer, it can take 3-5 full days of work, not including permit acquisition and inspection wait times. Beginners should consider professional help for critical steps like concrete cutting and main line tie-ins.
What permits do I need, and how do I ensure my rough-in plumbing passes inspection?
You will almost certainly need a plumbing permit and possibly a building permit. Contact your local building department early in the planning phase to understand all requirements, necessary inspections (like the rough-in inspection), and specific code regulations for pipe sizing, slope, and venting to avoid costly rework.
What's the best way to break up the concrete floor, and what safety precautions should I take?
A demolition hammer or electric jackhammer is highly recommended for efficiency, which can often be rented. Wear heavy-duty work gloves, steel-toed boots, eye protection, hearing protection, and a dust mask to protect against concrete dust and flying debris. Be mindful of existing utility lines marked during the planning phase.
What are the most common mistakes when installing the underground DWV pipes, and how can I avoid them?
Common mistakes include incorrect pipe slope, inadequate solvent welding, and insufficient depth for drain lines. Ensure a consistent slope of at least 1/4 inch per foot for proper drainage, use proper primer and cement for strong, leak-free joints, and confirm all pipes are securely bedded in gravel to prevent shifting.