Dunkie38

Thanks Nick but what is VMC. The builder used a lot of insulation but not sure if he put it behind this particular wall as even though it`s internal it also forms part of the dependance which we are not renovating.. However the floor level in the dependance is above that of the house. The builder is only talking about putting the drainage on the side wall of the house whereas we think it should be behind rather than on the side. Perhaps we need to have more discussions with him and in more detail. Pat

Have read other info re this problem which has been very helpful but want to know what to do about damp which has appeared on the internal dry liner walls. It first showed itself in the grouting in the floor tiles and thought it may be a leak in the pipes.Have taken readings of the water meter counter & it isn`t that.The builder wants to put in "drainage" on the outside wall as he is convinced that it is a leak from outside which is feasable.However the walls showing the damp(black and brown) are in front of very damp stone walls and I`m concerned about paying out a sum of money for drainage if the original walls should have been treated against the damp before putting up the dry liner walls.This problem has arisen over  2 to 3 years.We have dry liner walls in our house in uk and have never seen this problem before and we live in a very damp area of uk. There are no vents in the dry liner walls but there is insulation.Any ideas please as the quote for the drainage is 2000euros and we`d thought we`d finished paying the builder! Pat