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Talk to the experts at Vinsun Building Supplies about which is the right waterproofing membrane for you

Waterproofing is an essential element of all aspects of building design and construction.
Water ingress accounts for a large percentage of building envelope failures and will usually require expensive repairs and remedial action.
Waterproof membranes are a critical part of residential house and commercial building practices whether you’re trying to stop water from escaping from a swimming pool or need to prevent the passage of water into walls and habitable areas.
Waterproofing membranes are typically found in the following:
• Foundations and retaining walls
• Bathrooms, wet areas, & pools
• External walls, balconies & terraces
• Roof decks and plant room floors
• Car park docks and lift pits
Australia’s climate, with its torrential downpours and high humidity, as well as rising sea levels and increasing flooding events means that installing adequate waterproofing membranes is essential.
Water ingress can rot timber framing and flooring, rust pipes, crack concrete, undermine foundations and create dangerous mould problems.
Adequate waterproofing layers keep your buildings safe and dry and lower your heating bills as well.
Waterproof membranes also play a vital role in restoration and repair projects. Heritage buildings and homes may be at risk from water damage due to poor design and changes in ground water levels.
Slumping foundations, damp basements, and mould are common signs of a water issue that needs attention.
There is a vast range of waterproof membranes available; some are multipurpose whilst others are designed for highly specific applications.
Use this guide to explore the range of waterproof membranes that we can supply.

Where Waterproof Membranes Are Commonly Used

Bathrooms & Showers

Wet areas such as bathrooms, showers and laundries can be a real challenge for ensuring timber framing & flooring, insulation materials, electrical wiring and internal cladding materials are not exposed to damaging water ingress.
The risks of water ingress with standard acrylic tray and wall showers is significant in its own right but becomes even more important if you wish to install a wet area shower.
Even small amounts of moisture can damage some flooring products, in particular the particle board type, leading to swelling, popped joints and nails/ screws and eventually the complete degradation of the material.
A waterproof membrane is essential in wet areas both for floors and walls. Coverings such as tiles or vinyl do not provide an adequate level of protection by themselves.


Waterproofing Membrane Types

Waterproof membranes come in a range of types designed for different applications and conditions.

Membranes need to be flexible and able to expand and contract when temperature changes cause the building surface to move.

Which one is right for you will depend on a number of factors. You may need to consider the following aspects:

  • UV exposure
  • Type of substrate
  • Exposure to dirt & traffic
  • Size of area to be covered
  • Internal or external use
  • Storage of potable water

It’s important to choose the right waterproof membrane material for your specific job and know how to apply it.

Remember, the major reasons for waterproof membrane failures are poor or inadequate preparation and incorrect product choice.


There are essentially three types of liquid membranes; water or acrylic –based, bituminous, and cementitious.
Liquid membranes offer real flexibility in application and are usually applied using trowels, rollers or spray guns.
Polyurethane is a highly popular liquid waterproof membrane that can be in the form of a water-based, acrylic-based or even a hybrid type product.
It is ideal for use in many different situations including concrete and timber surfaces in both internal and external situations. Polyurethanes cure to form a tough seal.
Polyurethanes also frequently have low VOC ratings, which means they are better for your health and the environment.
Polyurethanes often have a rapid drying time and so can be in full service within a very short space of time. You may need to add a top coat for UV protection.


Bituminous membranes are most commonly used underground for foundation protection or in internal settings.

Exposure to UV or heavy traffic can damage some bituminous products but many manufacturers overcome this with the addition of acrylic latex or other polymers to add flexibility.

Bitumen membranes often feature a non-woven reinforcing fabric layer as well.


Bitumen rubber products offer outstanding flexibility and adhesion.
They’re great for retaining walls and underground surfaces and can be used with concrete, fibre cement, plasterboard, galvanised iron, Zincalume, and even polystyrene.


Some waterproof membranes are available as self-adhesive sheets. These are easy to apply and are usually low VOC rated so are good for the environment.

PVC sheets are especially durable and deliver exceptional waterproofing performance.


C1p Cementitious Membrane

C1P is a single product flexible polymer and cementitious membrane for either positive or negative pressure applications.
It’s suitable for underground, submerged applications.



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