Sandstone cladding or veneer if you're fancy. This natural stone ranges from 40mm thick to 5mm thick in some places so it has to be worked very carefully. I could use a saw but it's faster, cleaner and less girly to just use the chisel. There used to be a time where suppliers would send this out and people would stick it straight onto the wall. That day is thankfully gone and house owners are ripping that down and redoing it properly. This will be pointed at the end to create that rustic old loo