CPCCWP3003A Apply waterproofing process to external wet ...

CPCCWP3003A Apply waterproofing process to

external wet areas

TRAINER’S ANSWER PACK

Type Title Standard Issue Version Ref Release date TAP CPCCWP3003A Standard 1 1 1 Apply waterproofing process to external wet areas 28/08/2014

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TRAINER INSTRUCTIONS

This package has been compiled to assist Trainers in the on site, timely and accurate correction of students written or verbal assessments. All pages of the “Assessment Package” are to be returned to TAM Administration for the recording of the students attainment.

Forms of Assessment The trainer is required to obtain at least 3 types of evidence but preferably more. These may include but are not limited to the following:-

1. Written or Verbal Assessment (the later for those with writing or literary difficulties)

2. Observation by the Trainer of ‘on-site work’ called Practical Assessment for work carried out on the student’s job site.

3. A Third Party Report completed by the employer after he is satisfied that the student/trainee has demonstrated the required knowledge and skills consistently whilst on the job.

4. A Photographic Record of work completed on site corroborated/signed by the employer where possible with the trainee carrying out the actual work. These photos should contain name, date, and the units that are supported by the photographic evidence. (Only to be used as supportive evidence)

5. Other forms of evidence including recognition of prior learning and skills, corroborated by a former employer accompanied by photographic evidence or a CT being a credit transfer from a previous RTO where a trainee has already completed some or all of that unit of competency.

Completing the Assessment Cover Sheet • Trainer is to tick the Yes box against each Form of Evidence if the student has

completed this part successfully. • Trainer is to place a cross (X) against any element attempted that is not

successful. • Do not place anything against evidence if the student has not attempted it. • Ensure that you can provide evidence of all assessments attempted. A

minimum of 3 items of assessment, at a satisfactory standard, are required for students to achieve competency. Normally it is possible to provide more.

Student Feedback Trainer is to ensure that at the completion of the training course (Qualification) an AQTF feedback form is completed, and forwarded to Administration for processing.

Administration Processing Administration personnel must ensure all relevant forms of assessment are attached prior to processing the outcomes of the training and assessment. If there is any information not finalised the complete package for that student must be returned to the relevant trainer to rectify.

Type Title Standard Issue Version Ref Release date TAP CPCCBL3005A NVR Standard 15.5 2 1 Lay masonry walls and corners 14/08/2014

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1. What is the most common complaint to all of the State run building commissions?

The most common building complaint received by the States Building Commissions relates to the failure of waterproofing systems installed in external above ground situations. In a number of these cases, it is common to find water penetrating into the building around the sill of doors and windows at floor level

2. Explain the signage/barricade requirements that you should have in place. Consider your own as well as public safety especially around open-ended balconies. Erect a safety barricade with signs that it is a construction site, you must protect your work from others and more importantly protect the public and other workers from coming into harms way. If other workers walk on fresh waterproofing it will be damaged and you may have to start again.

3. How would establish the amount of waterproofing materials needed to complete the task? Measure up the area to be waterproofed and read the manufactures instructions for the material to be used and work it out from there. Divide your total square metres by the amount each bucket should be able to cover for the total amount of buckets, any sealants or reinforcing materials comes naturally on top of these.

4. What is the Australian Standard and codes that covers Waterproofing membranes for external above-ground use? Waterproofing membranes for external above ground use must comply with AS 4654

• AS 3740-2010 (Wet areas in Class 1, 2, 4 and units in class 3 buildings) National Construction Code of Australia

• 1st May 2015 NCC available for free • Waterproofing membrane comply to AS/NZ 4858 • Other specific regulatory will apply • System warranty is from several manufactures

5. Where can you look to check on waterproofing requirements for balconies and planter boxes?

Always check the architect’s specifications for the type of waterproofing and the area to be considered. This may vary considerably from low rise to high-rise. E.g. a terrace slab at ground level requires a lot less that one at first or second floor.

ASSESSMENT ANSWERS


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6. How should balconies and planter boxes be prepared for waterproofing? For concrete slabs they should be cleaned and ensure there is no residual dust or other contaminates to receive membrane. Ensure that all cracks and penetrations as well as corners are treated as required by the product manufacturer and the job specifications

7. How would you treat drainage penetrations to ensure it remains waterproof below the surface?

Penetrations such as handrail posts, balusters, drainage pipes, downpipes etc. should be correctly detailed and reinforced with webbing or fibreglass to enable adequate termination and sealing of the membrane system. Some newer products may not require this so read the instructions but also it is important to coply with the specifications

8. What is debonding and when and where can it occur?

Insufficient surface preparation at the concrete surfaces receiving the membrane material can cause debonding of membrane near the joints. This is even more so in precast panels or fibrous cement board. Prior to the application of the joint sealant, all loose materials, debris and weak concrete that may inhibit the sealant from adhering to the joints have to be removed. Backer rods of appropriate sizes should be inserted into the joint as backing for the sealant material. The sides of the joint are taped before gunning the sealant into the joint. The joint is then tooled to achieve a smooth even surface, and the masking tape removed to allow the sealant to cure.

9. List 3 major substrate construction issues that may lead to waterproofing failure?

Answer may include

1. Incorrect wall/floor junction construction 2. Penetration holes cut too large 3. Contaminated accessories

4. Overdriving of fasteners & incorrect framing

5. Incorrect substrate installation


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10. List 3 issues that may cause balcony waterproofing failure if applied incorrectly?

Incorrect substrate preparation – grinding or smoothing off rough areas Possible other contaminates e.g. paint oil or grease, even dust Surface receiving membrane is too warm from sun – it will debond Surface receiving membrane is still moist or damp and it will bubble Membrane applied too thickly or too thinly – only follow instructions for application 11. List 5 articles of PPE you would require when waterproofing a balcony or other high area?

PPE may include but is not limited to:- Safety boots or safety joggers Helmet Safety Glasses Respirator Kneepads Earmuffs Hi visibility jacket Harness and ropes for working at heights 12. What must you be particularly aware of when carrying out the above mentioned task?

1. The greatest danger is possible fall from heights or on windy days loosing your balance and been blown over the side of a balcony. Always ensure a temporary handrail is installed.

2. Secondly is the possibility of sunstroke on very hot and sunny days you should also be aware of the maximum temperatures allowed to apply the membrane.

3. Thirdly is the risk of other workers walking out on to your work area slipping and

falling over the edge. Ensure that barricades are in place to keep them away. 13. How would you clean up brushes and rollers and ensure no environmental contamination occurs through your work or actions?

Usually brushes and rollers are cleaned with petrol solution or water depending on the product and the mix burnt off. If it is a bitumen based WP membrane. If they are badly covered it is often the case that they are allowed to harden and thrown into the rubbish as the cleaning causes more problems than it solves and replacement rollers are fairly cheap. If the membrane used is water soluble then they are cleaned in a bucket of water and the solution is poured into a sand trap and allowed to evaporated and harden. (Never down the drain)


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14. Explain when and why you would use a roller on a long pole to apply waterproofing?

The cleverer waterproofer will always use an extension pole as this widely increases your reach and will decrease the amount of effort required to apply the membrane. This is particularly hand for in hard to reach areas and eliminates the need for scaffolding and trestles in the process. 15. Where should weep holes be installed under door thresholds and when can you cover them with waterproofing membrane?

Weepholes should be installed at a maximum 600 centres under door threshold and wall cavities. This will enable any water at the back of the sill to drain to the exterior. Shrouds may be fitted to deflect wind pressure. Skirting tiles should not obstruct weepholes.

16. Explain the treatment for cracks in the concrete balcony?

Concrete substrates need to be checked for movement and settlement cracks. A structural engineer should assess cracks over 1mm. Where liquid applied systems are used, cracks should be ground out, primed and caulked with a compatible sealant to the structural engineer’s specifications. Where a pour break occurs in a concrete slab it should be treated as a crack joint and should be ground out, primed, and caulked with a compatible sealant to the structural engineer’s specifications. 17. One coat is always sufficient for balconies as we need to consider the cost and effort required for such work?

☐ TRUE � FALSE 18. Deck penetrations are always made during the concrete pour, a cut out or Styrofoam block is left where the drain should go

� TRUE � FALSE 19. Second coat waterproofing should only ever be installed if the owner insists he needs it?

� TRUE � FALSE


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20. What is the phenomenon whereby liquid spontaneously rises in a narrow space?

Capillary action, or capillarity, is a phenomenon where liquid spontaneously rises in a narrow space such as a crack in concrete, or in porous materials such as blockwork or in some non-porous materials such as mortar concrete or simple bricks. This effect can cause liquids to flow against the force of gravity and infiltrate a basement. This is long term damaging and dangerous as over time toxic mould may develop. 21. Explain how roof drainage can possibly affect a balcony or planter box?

Never allow roof drainage to simply end at the deck level and run onto the concrete or patio. It must be piped away from any structure. Allowing it to pond close to a building is asking for trouble. If it is allowed to pond it will form a mini lake and eventually find a way into the structure. 22. Explain how capping may be helpful?

Capping is usually a preformed metal element that overlaps a membrane system; however, it can also be a liquid applied hi-build coating system compatible with the primary membrane. Preformed capping should be side-fixed, not top-fixed as water can pond around the fixings. Build up of water around the fixings will eventually leak through the fixing holes and at the lap joints possibly causing delamination of the membrane and water penetration into the structure. Industry best practice is to install a capping with fall to the roof so that water does not pond on the surface of the capping. 23. List the safety gear and equipment that you would consider using other than PPE? Safety equipment and gear that you could use may include but is not limited to: - Air ventilation equipment such as an exhaust fan if there are enclosed areas A simple fan Lighting equipment Paint brushes and rollers Caulking guns both manual and electric Scissors, Stanley knives, chisels Trowels, hammers, buckets Masking tape Barricades to stop fall Possible fall arrest system


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24. Explain the minimum fall for balconies?

The fall on the substrate level should be not less than 1:100 this means that for every 100cm of distance that the surface must rise at least 1cm as we get closer to the structure 200cm then a rise of 2cm and so on. 25. What in the perimeter design of the balcony will reduce wind driven water on the surface of the balcony?

The perimeter design of the balcony should reduce the influence of wind driven water on the surface of the balcony by the design of hobs, balustrades, parapets or screens. 26. What are the 3 types of screeds that can be applied to a balcony?

The three types of screeds are: • Isolated (unbonded); • Floating; • Bonded.

27. What is the preferred construction for planter boxes and why?

The preferred construction for planter boxes is poured concrete as this is much more impervious to water penetration and easier to waterproof 28. When the planter box is to be built on a level concrete slab what is the first thing to do in the planter box.?

Concrete bedding should be installed in the box to give fall towards the drains

29. Is it sufficient to simply waterproof the planter box and fill with earth? Explain your answer?

No the membrane still needs to be protected from gardening instruments with some form of banner or flexi board


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30. You are working for a developer and have been given 10 balconies in a complex to waterproof and each of the balconies has two planter boxes Calculate the amount of material you will require if one bucket only does 12sqm and the

total area of waterproofing is 15.8sqm per unit + another 4sqm per planter box. List the other waterproofing materials you may require as well as the number of buckets of membrane or other materials you would use.

Total area of balconies to be waterproofed =

10 x 15.8 balconies + 2 (number of planter boxes) x 4 for each planter box

= 238 sqm of waterproofing divide by 12sqm per bucket

= 19.8 or 20 buckets of membrane solution

You would also need a roll of reinforcement materials and a box or two of sikka flex for

all corners depending on what product you are using.


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