Q: How best to detect source of a leak on a balcony?
A: First block drain outlets and create bund on edges
Use hose to fill area and apply non-hazardous dye.
Observe sides/underside of substrate to locate leakage.
Q: What is the best membrane product to use and how do they differ?
A: Acrylic paint on products is most widely used due to application ease.
Polyurethanes perform well: may need to blitz with sand to enable further adhesion.
Cementitious membranes offer the advantage of negative protection.
Q: How long should a coating last?
A: Depends on exposure to the elements, and method of application and maintenance program. Waterproofing membranes are tested for aging under AS4654.2.
Q: What guarantee should I expect?
A: A manufacturers warranty will apply for products tested to an Australian Standard. A separate warranty may be obtained by a contracted applicator.
Q: Should a primer be used in all circumstances?
A: Primers assure adherence. A diluted solution of acrylic membrane can serve as a primer.
Q: What is a bond-breaker?
A: Breaks the bond between substrate and membrane creating flexible elastic bridge that can stretch and move to accommodate building movement.
Q: What is the minimum fall required for an outside balcony/slab?
A: The minimum fall is 1:80 ratio.
Q: How many coats should I apply?
A: Minimum of two coats.
Q: What is the interval between coats?
A: Follow the manufacturer’s guidelines.
Q: Why should I use polycloth tape?
A: Provides strength and flexibility to the membrane when applied over joints.
Q: What is the best means to ensure tile adhesive sticks to membrane?
A: Use a compatible adhesive. Follow manufacturer’s recommendation.
Q: Can I apply a clear coating over my tiles to stop water leaks?
A: No. However, you may apply a clear water repellant which will provide an improved water-tight balcony.
