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WATERPROOFING AND SEALING AUSTRALIA SINCE 1957

Crommelin Waterproofing Applicator Certification

Lesson 6 Quiz

Crommelin Waterproofing Applicator Certification Membrane Application Lesson 6 Quiz

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Question 1 of 12

1. Question
What is the difference between waterproof and water resistant?
- There is no difference between waterproof and water resistant.
- Waterproof coatings still let water through to some degree, water resistant coatings are completely impervious to water.
- A waterproof coating is completely impervious to moisture, a water resistant coating will allow moisture through to some extent.
- Both waterproof and water resistant coatings allow water to pass through.
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Question 2 of 12

2. Question
What are the determining factors that dictate where a wet area needs to be waterproof or just water resistant?
- The class of waterproofing membrane being applied.
- The waterproofing membrane technology and performance characteristics.
- The colour of the waterproofing membrane being applied.
- Substrate type, shower design and associated waterproofing standards.
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Question 3 of 12

3. Question
What are the best environmental conditions to apply under-tile waterproofing?
- Ambient and surface temperature between 7˚c to 35˚c, humidity below 85%, not in direct sunlight or in windy conditions.
- Environmental conditions are not a consideration during waterproofing membrane application.
- Cold, damp internal applications with poor air flow.
- Hot, dry external applications in direct sun light and wind.
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Question 4 of 12

4. Question
What is the most important factor that assists membrane cure?
- High temperatures and high humidity.
- Good ventilation and air flow.
- The type of surface primer applied prior to the waterproofing membrane.
- The moisture content of the substrate waterproofed.
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Question 5 of 12

5. Question
Why is it important to apply the correct membrane film build?
- It is not important to apply the correct membrane film build.
- Film build is just a guide and does not need to be adhered to.
- Correct film build is important to ensure that tiles can be adhered direct to the waterproofed surface.
- To ensure that the membrane retains its flexibility and waterproof performance characteristics.
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Question 6 of 12

6. Question
Is one thick coat better than 2 coats?
- No. 2 even coats at the correct application rate is recommended.
- Yes, 1 thick coat is ok.
- Multiple thin coats are ok, as long as the total final film build is acceptable.
- The number of coats is unimportant.
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Question 7 of 12

7. Question
When is it ok to apply the second coat?
- When the first coat becomes tacky to the touch.
- Only after 24 hours.
- Once the first coat is completely dry – including in the corners and around any areas of bond breaking or reinforcement.
- Immediately after finishing the first coat.
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Question 8 of 12

8. Question
When is it ok to tile over Crommelin under-tile waterproofing membranes?
- After 12 hours.
- In as little as 4 hours, however waiting over-night is best practice.
- After 24 hours.
- Only after full cure is achieved.
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Question 9 of 12

9. Question
When is it ok to expose Crommelin under-tile waterproofing membranes to moisture?
- Only after full cure has been achieved.
- Straight away.
- Within 4 hours.
- After 24 hours.
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Question 10 of 12

10. Question
What must be completed prior to tiling over under-tile waterproofing membranes?
- Nothing – simply tile over.
- Cleaning of all application tools prior to the membrane drying.
- Conduct a visual inspection of the membrane, check for any cracks, tears or voids and repair as necessary.
- A final measurement of the area to ensure that sufficient membrane has been applied.
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Question 11 of 12

11. Question
Do you apply Crommelin under-tile waterproofing membranes above or below a screed?
- Above the screed.
- Below the screed.
- Best practice is to waterproof both above and below the screed.
- All of the above.
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Question 12 of 12

12. Question
What Crommelin documents should be used to ensure that membrane application has been completed correctly?
- Waterproofing substrate preparation check list.
- Waterproofing surface priming check list.
- Waterproofing membrane application check list.
- All of the above.
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Course Content

Crommelin & the importance of getting it right 1 Quiz

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Lesson Content

Waterproofing Standards 1 Quiz

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Lesson Content

Surface Preparation & Priming 1 Quiz

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Lesson Content

Crommelin Under-tile Waterproofing Membranes 1 Quiz

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Lesson Content

Bond-Breaking & Joint Reinforcement 1 Quiz

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Lesson Content

Membrane Application 1 Quiz

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Lesson Content

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