Plumbing an Upstairs Toilet: A Comprehensive Guide
Plumbing an upstairs toilet can be a daunting task, but with the right knowledge and tools, it's a job you can tackle yourself. This guide will walk you through the process step-by-step, ensuring a professional finish that will serve you well for years to come.
Tools and Materials Needed
Before you start, make sure you have the following tools and materials:
- Toilet (including tank and bowl)
- Wax ring
- Toilet bolts and washers
- Tape measure
- Level
- Adjustable wrench
- Hacksaw
- Screwdriver
- Plunger
- Bucket
Preparation
Before you begin, turn off the water supply to the old toilet and flush it to empty the tank. Disconnect the water supply line and the drain line, then remove the old toilet. Clean the area thoroughly to prevent any blockages or unpleasant odors.

Installing the Wax Ring
The wax ring is a crucial component that creates a watertight seal between the toilet and the drain. Center the wax ring on the drain opening, ensuring it's flush with the floor. If the ring is too high, you can trim it with a hacksaw.
Positioning the Toilet
Position the toilet bowl over the wax ring, ensuring it's centered and level. Use a tape measure to ensure the toilet is the correct distance from the wall (usually 12 inches). Once you're satisfied with the position, gently press down on the toilet to create a tight seal with the wax ring.
Securing the Toilet
Secure the toilet to the floor using the bolts and washers provided. Insert the bolts through the holes in the base of the toilet and the floor, then secure them with washers and nuts. Tighten the bolts by hand initially, then use an adjustable wrench to tighten them further. Be careful not to overtighten, as this can crack the porcelain.

Installing the Tank
Position the tank on the bowl, aligning the holes with the bolts on the bowl. Secure the tank to the bowl using the provided bolts and washers. Connect the water supply line to the tank, ensuring it's securely fastened and there are no leaks.
Testing the Toilet
Slowly turn on the water supply to the toilet. Check for any leaks around the base of the toilet or where the water supply line connects to the tank. Flush the toilet to ensure it's working correctly. If everything is functioning as it should, you're done!
Troubleshooting Common Issues
| Issue | Solution |
|---|---|
| Leaking around the base of the toilet | Tighten the bolts or replace the wax ring |
| Toilet rocks or wobbles | Tighten the bolts or use shims to level the toilet |
| Toilet doesn't flush properly | Check the water level in the tank, ensure the flapper is sealing properly, or clean the jets in the rim of the bowl |