My walls are weird! They are fully ranked with tanking slurry for a start. Fixing to the internal walls is pretty much impossible apart from in the most desperate needs. They are 900mm thick flint walls which have been heavily repaired over the years with just about every material you can imagine, so it’s pot luck what you hit. The walls are then tanked and have 100mm insulated plasterboard on top of that.
My walls are weird! They are fully ranked with tanking slurry for a start. Fixing to the internal walls is pretty much impossible apart from in the most desperate needs. They are 900mm thick flint walls which have been heavily repaired over the years with just about every material you can imagine, so it’s pot luck what you hit. The walls are then tanked and have 100mm insulated plasterboard on top of that.