So where to start. I've recently knocked through two rooms into one, vaulting the ceiling in the process and skimming the room. Prior to this there was some evidence of historic damp in one corner (north facing), skimming has confirmed their is a damp problem in that corner. The damp patch suggests rising damp, but I'm not so sure because: the lounge floor is 30cm higher than the external floor and the house is built on sandstone, therefore, not your typical environment for rising damp. There is no evidence of damp outside the property, and having exposed the roof internally no evidence of any penetrating damp access. I've read reviews on the need for stone walls being able to breath and the need for adequate ventilation in stone properties, could this be my damp issue? The internal walls have a layer of mortar/concrete (not plaster), concrete skirting, and the two windows do not have trickle vents? Also, weather dependent the windows suffer from severe condensation, literally dripping, which causes damp around one of the windows (north facing). I'm contemplating inserting trickle or other vents in the room, and also removing the internal mortar/concrete around the problem corner and replacing with lime mortar? Will that sort it? Any comments most appreciated.
