Dampness on walls only during frost (mould growth)

antodeco · 22-11-2011 9:11pm #1

Hi all,
As the title suggests, my daughters bedroom has had a damp and mould problem. The walls were wet to the touch in the frost a few weeks ago. Nothing during the heavy rain. The house is 60 years old. The main bedroom had to get studded as a result of mould, but I cannot do this in my daughters room, as it's the box room.

I'm thinking of putting damp proof paint on the internal walls. Also, as there is stippling on the outside wall, going to seal this with paint as much as I can. Can anybody recommend decent internal damp proof paint, as well as external?

Her room has a clear vent, heating and double glazed windows.

Thanks

amacachi · 22-11-2011 9:14pm

In my experience the paint will stop mold but you'll need to dry the walls every morning, not a whole lot of fun.

antodeco · 22-11-2011 9:17pm

See the strange thing is that it's only when there's actual frost. Would external and internal damp proof paint not remove this?

BryanF · 22-11-2011 9:20pm

paint wont do much..
sounds like a lack of insulation meaning the internal surface of the wall is cold and any moisture in the air is condensing and subsequently freezing. (there has been high RH recently with the mild weather + we generate circa 1l per person over a night.

more ventilation may be required- but try leaving the window open at night first, and then maybe its times to consider external insulation..

antodeco · 22-11-2011 9:27pm

We were looking at getting the external insulation done. Problem is that it's end of terrace, so cost was 3.5k after grant. Plus, planning on getting a two storey side extension on the next few years, so dont want to get a good bit of work done for it needing to be removed again. Plus again, my boiler, external gas meter and side wall needs to be removed and re-positioned for the end wall, which is another cost on top again!

Dampness on walls only during frost (mould growth)

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