Tiler Waterproofing Checklist: Record the Substrate Before Tiling

The membrane is already down when you arrive. There are no dated substrate photos, nobody can explain the repairs, and your tiles will hide the lot. A tiler waterproofing checklist gives you a hold point: record what you can see, state what you cannot see, and get the next stage released in writing.

The checklist is not a certificate. It does not prove concealed work was done correctly. It records the inspection, the result, the person responsible and the next action.

Control the work with a quality checklist

A quality-control checklist turns a site conversation into a job record. Each check needs an area, an observation, a result and a name. If something fails, record who owns the correction and when it must be checked again.

Do not use one vague tick box for substrate, waterproofing and tile readiness. These are separate stages. A clean-looking membrane does not tell you what happened to the sheet joints underneath it.

Use these stage records:

• Substrate inspection before waterproofing.
• Waterproofing inspection after application.
• Test record where the job documents require one.
• Release for tiling after curing, inspection and corrections.
• Final record of defects, responses and approvals.

A tick without a note proves little. Write what you inspected. Name the room and surface. Record the drawing or specification used. Add a photo that shows the detail.

Build your tiler waterproofing checklist around the job

Start with the documents. Read the accepted quote, drawings, specifications, product instructions and program of works. Mark the areas included in your scope and the work assigned to other trades.

The checklist should identify:

• Job address and wet-area location.
• Drawing and specification revisions used on site.
• Accepted scope and exclusions.
• Specified substrate, membrane, adhesive and tile system.
• Builder, waterproofer and tiler responsibilities.
• Required inspections, tests and release points.
• Visible defects and corrective actions.
• Photos, supporting documents and approvals.
• The person who released each stage and the date of release.

Do not copy fixed cure times, moisture limits or test methods from an old job. Read them from the specified system and the current job documents. Record the instruction you used so the next person can follow your decision.

If the quote does not clearly assign preparation, waterproofing or repairs, fix the scope before booking labour. Use the bathroom tiling quote guide to separate preparation, waterproofing and tile installation in the quote.

Use a copy-ready site record

Keep the form short enough to complete while the area is open. Add detail in the notes and photos rather than hiding it behind a single pass box.

TILER WATERPROOFING CHECKLIST

Job:
Address:
Room or area:
Inspection stage: [Substrate / Waterproofing / Ready for tiling]
Inspection date:
Checked by:
Role or trade:

JOB DOCUMENTS
Accepted quote or work order:
Drawing revision:
Specification revision:
Product instructions used:
Agreed scope for this stage:
Work assigned to another party:

SUBSTRATE INSPECTION
Substrate type and location:
Surface condition:
Visible damage or contamination:
Planes, falls and levels checked against:
Joints and junctions:
Penetrations and wastes:
Changes of plane:
Moisture check required by job documents: [Yes / No]
Method and location, if required:
Result and acceptance requirement:

WATERPROOFING INSPECTION
Waterproofing completed by:
Areas visible at this inspection:
Areas already concealed:
Membrane details checked against:
Junctions, penetrations and wastes observed:
Required test:
Test result and attached record:
Cure or release requirement:
Proposed adhesive compatibility confirmed from:
Damage, contamination or later penetrations:

DEFECT OR ACTION
Checklist item:
Location:
Defect or missing evidence:
Responsible person:
Corrective action:
Inside accepted scope: [Yes / No / To be decided]
Written variation required: [Yes / No]
Recheck date:
Recheck result:

STAGE RESULT
[Accepted for next stage]
[Accepted subject to recorded item]
[Stopped pending correction and approval]

Released by:
Role:
Date:
Approval reference:
Photo references:
Attached documents:

Use the same area names on the form, drawings and photos. “Bathroom wall” is weak. “Main bathroom, shower wall, mixer penetration” tells the crew where to look.

Set hold points before work starts

A hold point is a stop. The next stage does not begin until the named person records an outcome. Put the hold points in the program of works and the tiler pre-start checklist before materials and labour are committed.

Assign these roles at the start:

• Who inspects and accepts the exposed substrate.
• Who corrects substrate defects.
• Who installs and records the waterproofing.
• Who reviews any required test record.
• Who releases the completed waterproofing for tiling.
• Who approves extra work outside the accepted scope.

The same person may hold more than one role. That does not remove the need to record each stage separately.

If the tiler and waterproofer are different trades, neither should assume the other accepted the substrate. The builder or job owner needs to assign that decision. Write the assignment on the work order or pre-start record.

For licence classes or home building contract questions, ask the regulator for the state or territory where the job sits. On a NSW job, put the question to NSW Fair Trading (opens in a new tab) and write down the answer for that job. A site checklist does not replace a licence, contract document, certificate or formal inspection required for the work.

Run the tiler substrate inspection before it is concealed

Start the tiler substrate inspection while the surface is visible. Identify the substrate in each area. Do not assume every wall or floor uses the same material or has received the same preparation.

Record visible damage, loose material, contamination, surface treatments and previous repairs. If a condition may affect the specified system, stop and compare it with the job documents and product instructions. Do not solve an unknown condition by covering it.

Check planes, falls and levels against the documents for that job. Record the tool or method used where the result depends on it. Do not invent a pass limit on the checklist.

Inspect the details that disappear first:

• Sheet joints and board junctions.
• Wall-to-floor junctions.
• Internal and external corners.
• Floor wastes and drainage details.
• Pipe, mixer and fixture penetrations.
• Changes of plane.
• Surface cracks, holes and mechanical damage.
• Transitions between different substrate materials.

Take a close photo and a wider location photo when a detail could be hard to identify later. Point out the defect with a removable marker or annotation, but do not cover the detail you need to show.

Only take moisture readings when the job documents or specified system call for them. A bare number is not a useful record. Write the area, exact location, method, result and acceptance requirement used for the job.

If the substrate differs from the drawings or accepted scope, do not start preparation to keep the crew busy. Send the record to the person assigned to make the scope decision.

Label photos so they still make sense later

Unlabelled room photos become camera-roll clutter. Every useful photo answers four questions: which job, which area, what detail and when in the sequence.

Use a consistent file note or caption. For example: job reference, main bathroom, shower waste junction, before waterproofing, inspection date. Keep the wording plain.

Link each image to a checklist item or defect reference. If you photograph a repair, capture the condition before correction and the result after correction. Record who accepted the repaired item.

Do not backdate an inspection. If another person supplied an earlier photo, identify that person and the date provided. Do not describe it as something you personally inspected.

A photo can show a visible surface. It cannot establish the condition of a concealed joint, penetration or repair that was already covered when the photo was taken.

Record the visibility limit when waterproofing is already complete

You arrive after another trade has waterproofed the room. The original substrate cannot be seen. State that limit at the top of the inspection record.

Ask for the earlier substrate checklist, labelled photos, membrane application record, required test result and stage approval. Record who supplied each document. Keep supplied evidence separate from your own observations.

Inspect only what remains visible. That may include exposed junctions, penetrations, wastes, changes of plane, surface condition and signs of later damage. Record missing evidence instead of filling the gap with assumptions.

The result might read “waterproofed surface visually inspected; original substrate concealed and not inspected by tiler”. That is a useful boundary. Signing an unchecked substrate as accepted is not.

If the earlier records are missing, escalate the hold point to the builder, waterproofer or client named in the job responsibility record. Do not release tiling merely because the crew and materials are already booked.

Stop, correct or change the scope

Give every inspection one clear outcome:

• Accepted for the next stage.
• Accepted subject to a recorded item.
• Stopped pending correction and approval.

Use conditional acceptance only when the outstanding item does not undermine the stage being released and the person with authority agrees to the condition. Name the item and owner. Do not write “minor defects to fix later”.

For a failed item, record the location, defect, owner, corrective action and required recheck. Keep the hold point open until the recheck has a result.

Connect the defect to the quote. Substrate repair may sit inside the accepted work, inside another trade’s scope or outside the whole job. Read the scope before moving labour or materials onto the correction.

If the correction is extra work, stop and write a variation. Describe the defect, the added preparation, the effect on the program of works and the price. Get approval before starting. The quote-writing guide helps you turn a site finding into clear scope instead of a vague allowance.

A verbal instruction at the doorway is not a closed hold point. Attach the written response to the job record and reinspect the area after correction.

Assemble the tile waterproofing records as one job file

Keep the checklist, photos and supporting documents together. The record should follow the work sequence rather than the order files reached your phone.

Your tile waterproofing records may contain:

• Accepted scope and exclusions.
• Current drawings and specifications used for the check.
• Specified product instructions used for acceptance points.
• Substrate inspection record.
• Labelled substrate and repair photos.
• Waterproofing application record supplied by the responsible party.
• Required test record and result.
• Defect notices, responses and rechecks.
• Approved variations.
• Stage release and identity of the approving person.

Separate your own inspection from information supplied by someone else. Use labels such as “observed by tiler”, “record supplied by waterproofer” and “release supplied by builder”. This prevents your signature from being read as acceptance of work you never saw.

You can issue the inspection as a task using a work order template. Yes Foreman can keep the job checklist, labelled photos, accepted scope and variation together in the job record. The point is one traceable file, not another inbox search.

Common questions

Can you tile straight onto waterproofing?

Only after the waterproofing stage has been released under the job documents and the surface is ready for the proposed tile system. Check curing, required inspection or testing, adhesive compatibility, contamination, damage and any penetrations made after waterproofing. If one of those checks is unresolved, do not spread adhesive.

Does a quality checklist certify waterproofing work?

No. It records what was checked, who checked it, the result and the next action. It does not replace a required licence, certificate, contract document or formal inspection, and it cannot certify concealed work the checker did not see.

What happens if the adhesive and membrane systems are not confirmed as compatible?

Stop the release for tiling. Check the specified systems and their current product instructions, then obtain a written decision from the person responsible for the specification. Do not test compatibility by installing the first tiles.

Put the hold point on the next wet-area job

Add the tiler waterproofing checklist to the job before the pre-start meeting. Assign the substrate check, waterproofing release and defect approval to named people.

Do not release tiling labour or materials while the result is blank. Open the next wet-area job now, add the substrate hold point, and name the person who must close it.