Sanjeev Sabhlok's notes on technology, hardware, gardening

Continue Reading
Continue Reading

External membrane over tiles in balcony

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

Continue Reading