Types of Water Proof Membranes

We use Marine grade waterproofing – A superb grade to ensure your bathroom never leaks. This is a superior membrane that offers absolutely everything – flexibility, strength and is chemical resistant.This waterproofing is not dissolved and not affected by bleach, bathroom cleaners and mould removers.

Polyester chemical cure

This membrane is the one we have used for the past 20 years with zero fails.

It is the material used in yacht building and has superior flexibility qualities. The membrane  is chemically cured- the polyester is mixed with a catalyst to start the curing process.

GRP mats are placed on the floor and walls while the polyester is applied to it. The GRP is then melted into the resin and when cured – it will harden to a flexible, chemical resist  moulded membrane.

This membrane withstands large structure movements and is superior for bathrooms.

The disadvantage of the membrane:

–  It produces a strong curing odour which last for 24 hours.

–  The membrane can only be applied to a dry surface.

–  Mistakes can be rectified only once the membrane has cured.

–  It requires protective gear when applied.

–  Some skills are required to apply.

Australian standard AS3740 is the guide for installation of water proofing but does not specify materials that can be used as water proofing.

This allows manufacturers to introduce variety of products for different application.

The common waterproofing materials are: 

An acrylic membrane

This membrane is commonly used for variety of applications. It is the cheapest and the easiest to use.

This membrane is usually not more than 1mm thick and tears very easily, especially between wall to floor joints.

The acrylic membrane does not offer much flexibility and is damaged by solvents.

Polyurethane single pack membrane

This membrane can be used on its own or can be reinforced with fabric.

This membrane is available at a wide variety of qualities.

The  manufacturers that offer a very good quality product are expensive but not suitable for bathroom application.

This membrane does not have good chemical resistance and will fail with extensive movement.

When applied on its own, a few applications are required to build up a thickness of a minimum 3-5mm.

If applied heavily, it will cure on the surface but will stay soft inside and will never cure. This will cause the membrane to fail.

This membrane performs well on retaining walls.