I am having a new conservatory to replace a 20 year old softwood one which had gone rotten.
The walls and their foundations are new; but the base has been built up on top of the old concrete one with a 50mm polystyrene layer and plastic membrane. This was done about six weeks ago.
The photo at http://tinypic.com/view.php?pic=638kvmw is a close up of the wall showing the edge of the membrane.
What concerns me is the wavy white line and the dampness below it. The floor and the rest of the wall are completely dry. It is just the damp area running all round the bottom of the wall.
The conservatory suppliers say that this is perfectly normal. But I would be very unhappy if damp appeared after the walls have been plastered.
Do I have anything to worry about?
The walls and their foundations are new; but the base has been built up on top of the old concrete one with a 50mm polystyrene layer and plastic membrane. This was done about six weeks ago.
The photo at http://tinypic.com/view.php?pic=638kvmw is a close up of the wall showing the edge of the membrane.
What concerns me is the wavy white line and the dampness below it. The floor and the rest of the wall are completely dry. It is just the damp area running all round the bottom of the wall.
The conservatory suppliers say that this is perfectly normal. But I would be very unhappy if damp appeared after the walls have been plastered.
Do I have anything to worry about?