White Set Plaster Failure
Traditionally, white set plaster is used for residential construction. It is applied over brickwork or blockwork. It is a durable finish that creates a smooth, mirror-like surface. These surfaces are ideal for internal applications such as wall finishing or patching.
Generally speaking, white set plaster walls are not visually apparent until after painting. This means that defects can be missed. However, they can be very costly. These defects can cause disruption to the home and financial hardship. They can also be easily cracked.
One of the main causes of these problems is uneven drying rates. This can occur because the brickwork or blockwork is not perfectly flat. Another reason is the moisture content. If the moisture content is too high, it can suck rapidly and lead to defects.
The Western Australian building industry urgently needs to address this issue. It is estimated that there are defective white set plaster walls in 10% of new homes built in Western Australia. The Master Builders Association (MBA) conducted a review of trade practices, to ensure the best practices in the industry were being followed.
A new industry bulletin was released in August 2016, addressing the paint adhesion to white set render. The bulletin recommended a number of education programs for contractors and the building industry. It suggested that the Building Commission develop a more thorough complaints process.
The Master Builders Association (MBA) has been working with paint manufacturers to ensure the best trade practices for painting white set plaster walls. A White Set Plaster Committee was formed to investigate this problem. It met five times, between June 2014 and March 2016. The committee investigated the factors that contribute to white set plaster failure.











