Is It Safe to Pressure Wash Double Brick Cavity Walls?
If you own a home in Western Sydney, there's a good chance it has double brick cavity walls. They're common across suburbs like Parramatta, Blacktown, Penrith, Liverpool, Campbelltown and the Hills District, particularly in homes built from the 1950s through to the 1990s. Over time, these walls collect dirt, mould, lichen, algae and pollution stains, and pressure washing looks like the obvious fix. But is it actually safe? The short answer is yes, but only if it's done corr