I remember reading a previous discussion about this subject but can't find it now so apologies for rehashing the subject.
We need to line a damp stone wall (you know the kind - 50cm thick)- it's a mix of rising and penetrating damp, we reckon and we need to placo it. We have space to build an inner wall and leave a gap but we were wondering if anyone has actually done this and avoided future damp problems and if so, how?
We were planning to build a wood frame leaving about 10cm gap, insulate between the studs with laine de verre and then put up a vapour barrier before placo. We also thought about airing the gap to the outside by drilling some holes and putting vents over the holes. Or we could drill some holes from the outside but just stop short of going right through the wall so as to help it dry out but not vent the air gap to aid the insulation effect. We could paint on hydrofuge to the wall to stop penetrating damp but then it would stop the rising damp from drying out....