If you’ve got a damp wall in an older building, chances are the plaster is to blame. One of the biggest culprits we see? Modern bonding plaster used on historic walls. It holds moisture like a sponge. Here’s a quick test you can try at home: Grab a compass point or sharp object and press it into the wall. If it goes in easily? Bonding plaster. If it resists and feels gritty? It’s likely traditional render; the right stuff. #waterproofing #waterproof #construction #building #housing