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So, where the actual vessel is placed against a wall, the wall must be water-resistant if the vessel is within 75mm of the wall. It is also important to note that the measurement needs to be taken from the outside edge of the part of the vessel that actually holds the water.
For plasterboard-lined walls, being water-resistant under AS 3740 means a combination of
So, the next time you’re looking at plans for a wet area make sure you check if the vessel will be situated against two walls. If that’s the case, you’ll need to ensure both walls are water-resistant to a height of 150mm, not just the one with the taps installed in it.