Sanjeev Sabhlok's notes on technology, hardware, gardening

External membrane over tiles in balcony


6 November: Spoke with Remedial membrane.

a) the external tile is a rough surface and the remedial membrane will stick to it too (one can use anti-slip mix)
b) the membrane should be installed in the early morning when the temperature is low, to allow it to cure properly DON’T install on a very hot day
c) the membrane does not create any problems in hot weather once it is cured
d) the life of the membrane is around 10 years although they warrant only four years if they install themselves.
e) there is no need to remove the membrane after 10 years. Only any areas with damage may need to be patched.


See VBA’s information sheet.

OPTION: A transparent layer on top of tiles:

OPTION: A torch based system:


The following points to note: [source]

  • We recommend liquid applied membrane systems for the Australian climate as the most practical and economic products for a secure job.
  • Seamless liquid applied membranes have become the ultimate solution for deck waterproofing.
  • A basic principle with new construction buildings is to view the job with the perspective that building movement will occur and therefore to secure all wall/floor joints, drains, balustrade, water exit points, hobs, sheet joints and movement joints.
  • Re-Grouting and sealing is definitely not the way to repair a leaking balcony that has an existing  defective membrane.
  • Sealing the existing tiles would probably stop or slow down leaks for a while until it moves and cracks the grout again then it would start to leak.
  • Laying a new waterproof membrane over a clean existing surface can work if the existing tiles are soundly fixed.
  • There may be some blistering with the new membrane due to water vapour trapped within but that is easily dealt with – balcony repairs just take longer while you wait for the vapour to dissipate ( with the new membrane over the top).
  • Many balcony designs have limited fall  and unless the waterproof membrane can “hold” water they will break down over time.
  • Liquid Rubber Membrane  which is designed to “ponding water”,  unlike a great deal of other membranes.


Causes of Failure in Waterproofing: Preparation

Causes of Failure in Waterproofing: Priming

Causes of Failure in Waterproofing: Substrate Moisture


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