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During the inspection of a property I discovered a basic mistake so many waterproofing contractors make when they waterproof a concrete slab forming part of a roof structure, the mistake are actually two fold, one they do not inform the client that it is important to apply a maintenance cote every one to two years depending on the product used. Secondly purely due to lack of knowledge or most likely supervision on the contractor’s side, I’m of the opinion is poor quality workmanship.
The process is very simple when you apply torch-on on to a slab where there is a joint the overlap should not be less than 100 mm and when ending it off against a parapet wall you take it up the inside vertical wall and stop 50 mm from to top edge of the inside wall. Secondly you need to form a capping over the full length and width of the parapet wall overlapping the inside vertical lip by 150 mm giving the inside overlap of 100 mm and going down the outside wall and trimming it parallel to the top edge at 100 mm leaving a neat finished edge that is hardly noticeable if painted.
The slab in the photos are being hammered with UV rays for the past six years the material are dry and in some places very brittle it can still be rescued with at least 3 cotes of alu-cote, it is a special paint compound with a very high aluminium content to reflect the UV rays and heat as well as a high content of bitumen particles that reacts with the suns heat and gets absorbed by the membrane in the torch-on strengthening its water proofing properties.
The result of the membrane ending in the middle on top of the parapet wall as displayed is moisture, moisture, moisture. New paint seals it for the first year. Then cracks form and by the third year blisters which open up and form nice little small catchment areas, every time it rains the water dissolves the limestone in the cement and moving deeper down the parapet wall, before long moisture blisters are visible one to two meters down the exterior wall on the interior and exterior painted surfaces. That is the reason one should form a capping over the parapet wall.
My advice is free you only need to ask
By Roald Olivier
Cell 082 495 4526
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