I have an old house with thick mud walls, the house was dry lined with inner battons and kingspan insulation with foil backing fitted between battons, however in the bedroom there still is alot of humidity even though no obvious signs of dampness any where, just a general feeling of humidity. The ceiling is wood but i havn't gotten around to putting insulation in yet, however i don't think this would make much difference to humidity. I don't know whether there is a damp proof course in the concrete floor, would it be a good idea to paint it with water proof sealant and then put down carpet? I have heard of people digging a trench around outer wall and then putting in drainage pipe and stone, would this do anything? The house is lower than some of the ground near it but this starts about 8 metres from house, has anyone much experience with old houses