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Just been into loft and found lots of water condensing on roof felt and dripping onto stuff in loft. Noticed this when we had last cold snap.
I'm sure the additional layers of insulation added a few years ago has made the loft a lot colder, so question is how do I cure the problem?
I'm sure there is enough ventilation in the loft so where do I stop warm moist air leaking into the loft space? The hatch seems a good fit and is insulated.
Any comments warmly welcomed
STS
It could be that there isn't enough air circulating theough the loft. It's very easy when isulating the loft to block or obstruct the flow of the eves vents. These allow air to circulate through the loft and prevent the buildup of warm, moist air from the house.
If this is the problem it should be quite easy to sort out, you just need to putt the insulation back from the vents and allow the air to circulate. It'll take a while for everything to equalise but should sort it out (with a bit of luck)
good info here:
[url= http://www.diynot.com/forums/viewtopic.php?t=160032 ]diynot/condensation in lofts[/url]
Yyou may well find that you don't have any vents in the eaves in which case you could install your own - can buy vents for a few quid. Or you could have ventilation tiles fitted in the roof which seems to be more popular today but is more expensive.
Check that the lagging is not blocking the front and
back of the eaves of the house.
Most people make this mistake when lagging there own home.
You must have a gap near the facia boards.
IE a couple of inches gap back from the facia board.
Also do check pipe work or lagging around any header tanks.
The more insulation you put in top of the ceiling joists, the less of a problem you will have with condensation so you could add more.
A 'proper' remedy would be to take off all or some of the roof and re-felt the roof with a modern breatheable felt but that's a big job. Even if you only took off the ridge and say a metre of roof.
you will reduce the problem if you do any of the following;
1 reduce the temperature inside the top storey of the house
2 increase the outside temperature (not really under you control!)
3 reduce the humidity inside the top storey of the house (ie dont dry clothes over the radiators, open the window a bit if having a bath/shower etc
C
as everyone else said, check ventilation, you need loads. The other possibility is extractor fans. I've seen too many that are just terminated in roof spaces, or are poorly connected.