Mould in house

Has anyone had ,and treated ,extensive mould in a house?
We have a house we rent which we bought last year and had damp. We had the damp proofers in and the injected a new dpc and the we had it re plastered. However, now after this winter there is mould growth on walls, including upstairs where there was originally no damp.

Obviously this is a health hazard and we have a family of 6 in there.

An agent I spoke to said they were saving similar problems with a house a few doors down and were told the render was too thick. They are 1930 s built ex council houses with concrete type render, all houses in the street are the same.
Has any one heard of this causing damp?

Wrong forum!

It can be. An overly thick render can prevent water escaping as it cracks, water penetrates then can't get out. If you have had a new DPC then possible previously it was escaping.

Damp issues are often caused by or made worse by the way the house is used and lack of ventilation. So it could be a combination of this or purely down to the render alone

As its an old house, we find letting the walls breath helps greatly, reduce clutter to a minimum. No wallpaper and plenty of fresh air. Try knocking the heating down a few notches. As already mentioned, any outside rendering issues must be resolved, but its not easy to control in old properties.

I would also go with lack of ventilation and possibly a source of dampness in the house. I bought a house for rental a few years ago which had water staining at the bottom of the walls but no sign of dampness entering, I eventually found that the hot water tank was leaking slightly, enough to raise the humidity, if all the windows were shut condensation formed and ran down the walls

Modern houses are to airtight with double glazed windows and doors, if you have central heating its not usually so bad but if you only have some rooms heated the warm air will condense on any walls that are cold. Try and leave the windows open in any unused rooms.

Peter