Ive got a house that was built in 68 as a non standard construction (steel frame with brick wall). In the 80s, the previous owner built a two storey extention on the side with garage at ground and bedroom above. At the rear of the garage, they had a small toilet room fitted in the corner attached to the original outside wall of the house. Never had any issues, but Im redecorating and unsure what I may or may not need to do. The wall joining the original outside of the house has had battoning with plasterboard to hide the pipework to the sink. Im fitting a toilet with built in sink so no longer have need to hide pipework as it wont be there now. Is it OK to plasterboard direct to the brickwork to then be lined and wallpapered, or do I need to keep the battoning to keep a gap between the plasterboard and the brickwork? If I need to keep it, is there a minimum thickness of gap I need to maintain? The extra space by not having the batons would give welcome extra width in the toilet room, but if it causes the wallpaper to get damp/mouldy, Id rather lose the extra width.
