The current standard practice is to protect the wall panel with a layer of plaster render and paint.  If or when the plaster render and paint cracks, water can leak in, causing expensive building damage. 

The advantage of using CodeMark-approved ThermalCrete for building interior walls is that you are starting the process with a tough, waterproof substrate. ThermalCrete's waterproofing quality overcomes the problem of water coming into direct content with the substrate. 

Not only that, but with ThermalCrete providing an outerskin 71% stronger than an AAC panel, it is also able to offer the designer and architect the added advantages of higher soundproofing and an insulated core, which maximises the thermal efficiency of the building.