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hi tiling, old walls, replace any old blown or unstable plaster, make good, pva walls 1:3 mix, tile over new tiling surface, avoid platerboard, would use a h/w wbp plywood aprox 12mm or a cement based board such as aqua panel. if you are including a shower area you will certainly need to use...

decorating plasterboard is a tricky proposition. was the platserboard plastered before painting, if so you should beable to sand flaking paint to a resonable finish. if not happy with finish dilute pva adhesive mix of 3:1 paint over area and re skim with a fine surface filler or joint cement...

hi, you should introduce a polythene membrane or breathable membrane to outer framework, use rockwool flexi slab 50mm between stud members and foil backed plasterboard or other board such as mdf, osb, sheathing ply to suit internally regards john

hi, i suggest you contact thermalite technical department and submit the question to them, they will for sure give you the correct advice.