Ripped out a bathroom on Monday, tiles 300mm x 250mm and there was a massive hole behind the tiles above the bath that went over 3 tiles long by about 1.5 tile high.
The hole was straight to the block so instead of dabbing in a new bit of board the guy had nailed some bits of wood together about 10cm long and 5cm wide for each tile and stuck the addy to that basically making about 90% of the tile completely hollow
