Having just spent a lot of money on having the roof fixed, it was, at the very least, disappointing to find a puddle on the living room floor last week. Admittedly it has been very windy and rained hard, but the roof should be completely watertight, not just fairly watertight. Having been in the loft to investigate, I could see that there are a few places where water has been dripping onto the the boards up there. I suppose the builders will have to take a look at that.
What is more concerning is that there is condensation on a lot of the underside of the roof. I suppose that is the effect of having had the ventilation gaps (leaking holes) filled in but I suspect that the insulation also needs to be moved from the edges of the roof space so that there is more breathing room. I guess we'll have to consult the builder when he comes to check out the leaks anyway.
The cause is simple, hot damp air in the loft space. The solution is not so simple - Dehumidifier, more insulation, new moisture membrane??? I don't really know
All told, it s a bummer and will no doubt end up costing money one way or another.
Fix the insulation which will lower the temperature drop across the rooftiles and stop the condensation. The roofspace should be cold.
ReplyDeleteWRM
It's cold up there, but apparently not cold enough. We have also started getting more condensation on the windows inside but I don't know where the humidity is coming from. Us I suppose as the humidity from the firs should be going up the chimney. We do get it rather woo hot in the house sometimes with the fire and I wondered if that might be causing a problem.
ReplyDeleteMake a hole in the roof again, you need some cold air blowing through.
ReplyDeletem
If you do not have controlled ventilation the water vapour will always just condense on the coldest available surface. The greatest sources of moisture are the breathers, cooking and bathing/showering. Drying clothes inside, even with a dehumidifier, can hardly help. G
ReplyDeleteI'm trying to discourage breathing but the kids don't like it much :-)
ReplyDelete