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Safety Cue
Task-specific safety guidance for ordinary work hazards.
Project 11
Replace and Set a Toilet
Remove an existing floor-mounted toilet, inspect the closet flange, install a new wax ring or approved seal, set and secure the replacement bowl and tank, connect the supply, and verify flush and leak performance on an approved, structurally sound flange.
Field Cue System
These cues appear at the point of work. They identify safety, code, manufacturer, and measurement issues before they become a failed seal, a cracked fixture, or a callback.
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Critical Safety Cue
Serious injury, sewage exposure, or major property damage is possible.
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Field Safety Cue
Practical work-area safety: lifting, footing, ventilation, and housekeeping.
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Code Alert
Local requirements vary. Verify permit, inspection, and jurisdictional rules.
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Manufacturer Cue
Follow product-specific instructions for the toilet, seal, and hardware.
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Measurement Cue
Reference-point, clearance, and verification guidance.
Job Overview
This project qualifies you to remove an existing floor-mounted toilet and install a replacement on an approved, structurally sound closet flange. The finished work product is one set, sealed, and tested toilet: a stable bowl and tank secured to the flange with a verified wax ring or alternative seal, a new supply connector, and a documented pass on repeated flush and leak testing.
You will shut off and drain the existing toilet, disconnect and remove it while protecting the open drain, inspect the flange for the conditions that determine whether replacement may proceed, install new closet bolts and the manufacturer-approved seal, set and secure the new bowl, reconnect the tank and supply, and verify performance through repeated flush cycles and a delayed reinspection.
This project depends on the isolation and work-area protection sequence from Project 01 and the fixture-stop and supply-connector skills from Project 07. It feeds directly into the Chapter 20 capstone, which uses this exact toilet-setting sequence to complete a small bathroom installation.
Skills You Will Demonstrate
- PL-061 — Remove an existing floor-mounted toilet while protecting the open drain and controlling residual water.
- PL-062 — Inspect the closet flange for elevation, attachment, condition, and drain security before proceeding.
- PL-063 — Install the manufacturer-approved wax ring or alternative seal on the flange or toilet as directed.
- PL-064 — Set the replacement toilet on new closet bolts and secure it without cracking the fixture.
- PL-065 — Connect a new supply connector to the toilet stop and inspect it under static pressure.
- PL-066 — Test flush and leak performance through repeated cycles and a delayed reinspection.
Where This Skill Fits
Toilet replacement combines the isolation and drain-down discipline from Project 01, the fixture-stop and flexible-connector skills from Project 07, and a seal-and-set procedure that is unique to this fixture. The flange inspection taught here — checking elevation, attachment, cracks, corrosion, and subfloor condition — is a required checkpoint before the seal is placed and before any weight is set on the connection.
The Chapter 20 capstone reuses this exact sequence to set the toilet in a small bathroom rough-in, following the closet-flange installation completed in that chapter's DWV rough-in steps.
Scope and Intended Use
This project covers:
- removing an existing floor-mounted toilet on an approved closet flange
- inspecting the flange for elevation, attachment, cracks, corrosion, slots, subfloor condition, floor level, and drain security
- installing new closet bolts and a manufacturer-approved wax ring or alternative seal
- setting, seating, and securing the replacement toilet without cracking the bowl or overtightening the closet bolts
- reconnecting or installing the tank, a new supply connector, and testing fill, flush, and leak performance
This project does not authorize the learner to:
- repair or replace a broken, unsupported, severely corroded, or incorrectly elevated closet flange beyond an approved adapter method
- alter the DWV rough-in, trap arrangement, vent connection, or drain piping beneath the flange
- proceed with the installation when the flange is surrounded by structural water damage or when the subfloor is soft, delaminated, or unsupported
- reuse a compressed wax ring or a seal that has already been seated once
Any flange, subfloor, or drain condition that fails inspection in this chapter must be corrected or escalated to a qualified professional before the toilet is set.
Reference Conventions
Establish these references before removing the existing toilet, and do not change the defined work boundary mid-project.
| Term | Definition |
|---|---|
| Rough-in distance | The measured distance from the finished wall to the center of the closet bolts or flange, used to confirm bowl compatibility |
| Closet flange | The fitting at floor level that anchors the closet bolts and receives the wax ring or seal against the toilet horn |
| Seal reference | The manufacturer-approved wax ring or alternative seal selected for the flange elevation and toilet condition |
| Seating pressure | The controlled, even downward pressure used to compress the seal fully in one motion |
| Stop-work condition | Any flange, subfloor, or drain condition that must halt the project until corrected or escalated, defined in this chapter's failure-point section |
Fixture and Flange Record
Before removing the existing toilet, record the fixture and flange data directly on the Toilet Replacement Worksheet:
Rough-in distance: ______ in Bowl configuration: ______ (Round front / Elongated) Flange type: ______
Floor condition at flange: ______ Supply location: ______ Date started: ____________ Builder name: ____________
Prerequisites
- A completed Work-Area Readiness Record for the bathroom, per Project 01
- The replacement toilet, seal, closet bolts, supply connector, and shims verified against the rough-in distance and bowl configuration before work begins
- Manufacturer installation instructions for the specific toilet model
- Owner authorization to interrupt water supply to the fixture
- Basic hand tools and PPE listed in the Tools, Equipment, Materials, and PPE tables above
- A stop-work decision authority to notify if the flange fails inspection
Common Field Fundamentals
Every toilet-setting project follows the same four-part sequence: remove and protect, inspect the flange, seal and set, then test and confirm. Skipping the flange inspection to save time is the single most common cause of a toilet that rocks, leaks at the base, or fails inspection after it has already been sealed with base caulk.
ShutdownToilet stop closed, tank drained, and residual water removed before disconnection
RemovalOld toilet lifted with a helper or approved method; open drain covered immediately
Flange checkElevation, attachment, cracks, corrosion, and subfloor condition verified before sealing
Seal and setNew closet bolts and seal installed; bowl lowered vertically and seated once
SecuringNuts tightened alternately, only enough to stabilize the bowl without cracking it
Supply connectionNew listed connector installed and inspected under static pressure
Flush testingRepeated flush cycles observed at the base, floor, and ceiling below
DocumentationRough-in, flange condition, seal type, and test results recorded on the worksheet
Flange Condition and the Stop-Work Boundary
The flange inspection in this chapter is the single checkpoint that determines whether the project may proceed with a standard seal and closet-bolt installation. A flange that is broken, unsupported, severely corroded, incorrectly elevated beyond an approved adapter method, or surrounded by structural water damage is outside this project's scope and must be escalated before the new toilet is set.
PL-061 – PL-066
Fixture Removal / Flange Inspection / Toilet-Setting Qualification
Replace and Set a Toilet
A. Finished-Project Specification
Quantity: one replacement floor-mounted toilet, set on new closet bolts and a manufacturer-approved seal, connected to a new supply connector, and verified through repeated flush and leak testing.
B. Component Schedule
| Component | Quantity | Material | Finished Size / Rating | Preparation |
|---|---|---|---|---|
| Toilet bowl and tank | 1 set | Vitreous china, manufacturer-specified | Matches verified rough-in distance and bowl configuration | Inspected for shipping damage before setting |
| Closet bolts | 2 | Corrosion-resistant, manufacturer-approved | Sized to the flange slot and bowl base | New; not reused from the old installation |
| Wax ring or alternative seal | 1 | Manufacturer-approved for the flange elevation | Standard or extended profile per flange condition | Placed once; not compressed and reseated |
| Supply connector | 1 | Listed flexible connector | Correct length and end connections for the toilet stop | New; routed without kinks or twisting |
| Shims | As required | Noncompressible, manufacturer-approved | Trimmed flush with the base after leveling | Installed only where the bowl does not sit level on the finished floor |
C. Toilet Replacement Schedule
| Item | Target Condition | Verification Method |
|---|---|---|
| Isolation and drain-down | Toilet stop closed, tank drained, and residual water removed | Direct observation |
| Flange inspection | Elevation, attachment, condition, and drain security confirmed before sealing | Visual and physical inspection |
| Seal installation | Manufacturer-approved seal placed once, in the correct orientation | Manufacturer instruction check |
| Bowl setting | Bowl lowered vertically and seated evenly without twisting | Level check and visual inspection |
| Securing | Closet-bolt nuts tightened alternately to stabilize the bowl without cracking it | Physical stability check |
| Supply connection | New connector installed and leak-free under static pressure | Direct observation under pressure |
| Flush and leak test | Repeated flush cycles pass with no leakage at base, floor, or ceiling below | Repeated observation and delayed reinspection |
D. Fastener and Hardware Schedule
| Joint | Fastener / Hardware | Installation Detail | Seating Condition |
|---|---|---|---|
| Flange-to-bowl | Closet bolts, washers, and nuts | Bolts installed vertically in the flange slots before the seal is placed; nuts tightened alternately, hand-tight plus the manufacturer's controlled additional turn | Bowl stable with no rock; nuts not overtightened to the point of cracking the base |
| Tank-to-bowl | Tank bolts, washers, and gasket per manufacturer sequence | Installed evenly in the sequence specified by the manufacturer | No leakage at the tank-to-bowl gasket under fill pressure |
| Supply connector | Listed flexible connector with factory end fittings | Threads started by hand and tightened per connector and fixture instructions using backup support at the stop | Leak-free under static and fill-cycle pressure |
E. Acceptance Standards
| Check | Standard |
|---|---|
| Flange condition | Structurally sound, correctly elevated, and free of cracks, corrosion, or drain-security issues before the seal is placed |
| Bowl stability | No rock or movement when pressure is applied at the front, back, and sides of the bowl after securing |
| Base seal | No leakage observed at the base during or after repeated flush cycles |
| Supply connection | No leakage at the stop or tank connection under static and fill-cycle pressure |
| Flush performance | Bowl fills, flushes, and refills normally through repeated cycles using paper and normal operating conditions |
| Documentation | Toilet Replacement Worksheet complete with rough-in, flange condition, seal type, and test results |
F. Removal and Flange Inspection
- Verify toilet rough-in, bowl configuration, flange type, floor condition, supply location, clearance, and manufacturer requirements. Confirm the replacement toilet matches the measured rough-in distance before removal begins.
- Shut off the toilet stop, flush, hold the lever to drain the tank, and remove remaining water. Use a sponge and bucket to remove residual water from the tank and bowl.
- Disconnect the supply connector and cap or contain it. Control any residual water released during disconnection.
- Remove tank hardware separately where required for safe lifting. Set the tank on protected material if it is removed independently of the bowl.
- Remove closet-bolt nuts and cut only approved corroded hardware. Use the closet-bolt wrench; cut a seized nut only when normal removal is not possible.
- Break the existing seal by controlled rocking and lift the toilet with the required helper or lifting method. Do not twist or drag the bowl across the flange.
- Set the removed toilet on protected material and immediately cover the open drain with a removable gas-resistant plug or cover. Confirm the cover is seated before proceeding to the next step.
- Remove the old seal without dropping debris into the drain. Use the putty knife to lift the compressed wax cleanly from the flange.
- Inspect flange elevation, attachment, cracks, corrosion, slots, subfloor condition, floor level, and drain security. Record each observed condition on the worksheet before proceeding.
- Stop work if the flange is broken, unsupported, severely corroded, incorrectly elevated beyond the approved adapter method, or surrounded by structural water damage. Escalate per the Failure Points section before continuing.
G. Seal Installation and Bowl Setting
- Install approved new closet bolts in the correct orientation. Confirm both bolts stand vertically and are seated in the flange slots.
- Select the manufacturer-approved wax ring or alternative seal for the flange elevation and toilet condition. Confirm the seal profile matches the flange condition recorded in Step F9.
- Place the seal on the flange or toilet as directed. Follow the manufacturer's specified orientation exactly.
- Lower the bowl vertically over the bolts without twisting or reusing a compressed seal. Align the bolt holes with the closet bolts before any downward pressure is applied.
- Seat the toilet evenly using controlled downward pressure. Apply pressure at the center of the bowl, not at one side, to compress the seal uniformly in a single motion.
H. Securing and Tank Installation
- Install washers and nuts and tighten alternately only enough to secure the bowl without cracking it. Check bowl stability after each partial turn.
- Shim with approved noncompressible shims if required, then trim and seal only as specified. Verify the bowl sits level front-to-back and side-to-side before trimming shims.
- Install or reconnect the tank using the manufacturer's gasket and hardware sequence. Tighten tank bolts evenly to avoid distorting the tank or bowl.
- Install a new compatible supply connector. Route it without kinks, twists, or contact with sharp edges.
I. Restoration and Testing
- Restore water slowly and inspect the stop, connector, fill valve, tank bolts, and tank-to-bowl connection. Confirm no leakage appears as the tank fills.
- Adjust tank water level and verify refill shutoff. Confirm the fill valve shuts off at the manufacturer-specified level.
- Perform repeated flush tests using paper and the fixture manufacturer's normal operating condition. Observe at least three complete flush-and-refill cycles.
- Inspect the base, ceiling below, surrounding floor, and all supply connections for leakage. Check the ceiling below whenever access is available.
- Confirm stability without overtightening the closet bolts. Recheck for rock at the base after the final flush cycle.
- Apply base sealant only as permitted while preserving any required leak-indication opening. Do not seal the entire base perimeter if local practice requires an open gap for leak detection.
- Complete a delayed reinspection and document the installation. Recheck the base, connections, and floor after normal use has resumed.
Common Readiness Inspection
Inspect every completed toilet installation using the same checks regardless of the specific model installed.
- Flange check: confirm the flange was inspected and passed before the seal was placed.
- Seal check: confirm the correct seal type and orientation were used and were placed only once.
- Stability check: confirm no rock or movement at the base after securing and after the flush test.
- Supply check: confirm no leakage at the stop, connector, or tank connection under static and fill pressure.
- Flush check: confirm normal fill, flush, and refill through repeated cycles.
- Documentation check: confirm the Toilet Replacement Worksheet is fully completed and signed.
Complete the Toilet Replacement Worksheet in the Inspection Checklist section below before beginning Project 12.
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Failure Points and Troubleshooting
Cleanup
This project ends with the new toilet stable, tested, and documented, and the old toilet properly removed from the work area.
- Remove the old toilet, old wax ring, and old closet bolts from the work area for proper disposal
- Wipe down the new toilet, floor, and surrounding surfaces
- Confirm the base seal or leak-indication gap is finished as specified
- Return tools to clean storage after separating any tools used near the open drain
- Store the Toilet Replacement Worksheet with the project records for reference during the delayed reinspection
Field Terms
- Rough-In Distance
- The measured distance from the finished wall to the center of the closet bolts or flange, used to confirm bowl compatibility.
- Closet Flange
- The fitting at floor level that anchors the closet bolts and receives the wax ring or seal against the toilet horn.
- Seal Reference
- The manufacturer-approved wax ring or alternative seal selected for the flange elevation and toilet condition.
- Seating Pressure
- The controlled, even downward pressure used to compress the seal fully in one motion.
- Closet Bolts
- The two bolts anchored in the flange slots that pass through the toilet base and secure the bowl.
- Base Seal
- The compressed wax ring or alternative seal that prevents leakage between the toilet horn and the flange.
- Stop-Work Condition
- Any flange, subfloor, or drain condition that must halt the project until corrected or escalated.
- Toilet Replacement Worksheet
- The document recording rough-in distance, flange condition, seal type, hardware, and test results.
Skill Check
- Why must the open drain be covered immediately after the old toilet is lifted, rather than after the flange has been inspected?
- What flange conditions require the learner to stop work and escalate rather than proceed with a standard seal installation?
- Why must the bowl be lowered vertically in a single motion rather than set down and repositioned?
- What is the risk of overtightening closet-bolt nuts, and how does the learner confirm the bowl is secure without overtightening?
- Why must a compressed wax ring never be reused on a second attempt at setting the bowl?
- What must the learner verify about the rough-in distance before the seal is placed?
- Why is a delayed reinspection required after the flush testing in Step I is complete?
- What must the learner check about the tank fill valve before considering the installation complete?
- Why must shims be noncompressible, and when are they required?
- What information must be recorded on the Toilet Replacement Worksheet before Project 12 begins?
Competency Rubric
| Competency | Independent Pass Standard | Not Demonstrated | With Assistance | Independently |
|---|---|---|---|---|
| PL-061 | Removes an existing floor-mounted toilet, controls residual water, and covers the open drain immediately after removal | |||
| PL-062 | Inspects the closet flange for elevation, attachment, condition, and drain security and correctly identifies stop-work conditions | |||
| PL-063 | Installs the manufacturer-approved wax ring or alternative seal once, in the correct orientation for the flange condition | |||
| PL-064 | Sets the replacement toilet on new closet bolts, seats it evenly, and secures it without rocking or cracking the fixture | |||
| PL-065 | Connects a new listed supply connector and confirms it is leak-free under static pressure | |||
| PL-066 | Tests flush and leak performance through repeated cycles and confirms results at a delayed reinspection |
Mark one column per competency. Only Demonstrated Independently awards the competency; Demonstrated with Assistance authorizes additional supervised practice but does not complete the requirement.
Inspection Checklist — Toilet Replacement Worksheet
| Item | Target Condition | Result | Pass/Fail | Correction (if any) |
|---|---|---|---|---|
| Rough-in and configuration | Verified against the new toilet before removal begins | |||
| Flange inspection | Elevation, attachment, condition, and drain security confirmed | |||
| Seal installation | Correct type and orientation, placed once | |||
| Bowl setting and securing | Seated evenly, stable, no cracking | |||
| Supply connection | Leak-free under static and fill-cycle pressure | |||
| Flush and leak test | Repeated cycles pass; base, floor, and ceiling below dry | |||
| Delayed reinspection | Base and connections remain dry after normal use resumes |
Flange condition and correction, if any: ____________________________________________
Installation declared ready: ______ (Pass/Fail) Date: ____________ Builder name: ____________
Performance Check
With the toilet set, secured, connected, and tested, review the finished installation against the Acceptance Standards table and confirm the flange passed inspection before the seal was placed, the bowl shows no rock or movement at any point of contact, no leakage appears at the base, the stop, or the tank connection under static and fill-cycle pressure, and repeated flush cycles complete normally with a dry base, floor, and ceiling below at the delayed reinspection. Complete the Toilet Replacement Worksheet and correct any failed item before beginning Project 12. If an item fails, identify whether the error occurred in flange inspection, seal installation, bowl setting, securing, or the supply connection before correcting it and re-running the affected check.
Project Closeout
You have completed the eleventh project in the residential plumbing sequence: replacing and setting a toilet. This project required you to remove the existing toilet, inspect the closet flange, install the wax ring or seal, set the toilet, connect the supply, and test flush and leak performance (PL-061 through PL-066).
You now have a repeatable flange-inspection, seal, and set sequence that applies to any floor-mounted toilet replacement. That sequence carries directly into the next project: diagnosing and correcting a running toilet using compatible replacement tank components.
Keep your Toilet Replacement Worksheet with the project records. You will reuse this exact flange-inspection and toilet-setting sequence for the Chapter 20 capstone bathroom installation.