Condensation problems on windows after air vents put in

majorwally · 25 November 2014 at 8:52PM

I had mould on ceilings so my builder suggested fitting some plastic soffit ventilators same as these

http://www.ebay.co.uk/itm/like/281309043996?limghlpsr=true&hlpv=2&ops=true&viphx=1&hlpht=true&lpid=108&chn=ps&device=c&adtype=pla&crdt=0&ff3=1&ff11=ICEP3.0.0-L&ff12=67&ff13=80&ff14=108

But now the condensation is awful, great big pools on the window sill and windows covered in water.
I have had new radiators also, so would it be the vents or the radiators causing the problem and how do i solve it?

leveller2911 · 25 November 2014 at 8:58PM

Major, Are the windows single or double glazed?. If they are single glazed windows the new radiators will make the problem worse.

Condensation forms where cold air meets warm air. So the increased warmth from the new radiators in the room meeting the cold glass will make the problem worse.

Soffit vents will ventilate the roof void only and stop the roof from sweating but I'm not sure they will totally solve your problem.Do you have any fibre glass insulation in the roof above the ceiling?.

We have A rated double glazed windows and still get some condensation on the top of the bottom rails of the sashes. A small amount is quite normal this time of year.

Can you post some photo's?.

majorwally · 25 November 2014 at 9:40PM

Double glazed and we have always had the insulation in roof above ceilings.

From what you are saying I presume it's the new radiators, maybe because they are bigger and more efficient?

brightontraveller · 26 November 2014 at 3:37AM

leveller2911 wrote: »

Condensation forms where cold air meets warm air.

It’s when warm moisture laden air meets a cold surface not cold air?

Vast majority of cases its lifestyle-induced condensation caused by "lack of ventilation" 99% of the time it can be cured which is often as easy as opening a window ?

Will tell you most of what need to know and how to rectify it

http://homestamp.com/wp-content/uploads/2012/07/Damp_Leaflet.pdf

http://www.heritage-house.org/about-condensation.html

Regarding loft this might also help

http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CCoQFjAB&url=http%3A%2F%2Fwww.kingspaninsulation.co.uk%2Fgetattachment%2F38612325-9f66-4bf4-914f-ef7c27f0e3de%2FWhite-Paper--Loft-Insulation---Ventilation-and-con.aspx%3Fdisposition%3Dattachment&ei=1Tl1VNjMKpSO7AbwxYCYCw&usg=AFQjCNFIk0KbJFZAK5yxbK9UccfV24csyw&bvm=bv.80642063,d.ZGU&cad=rja

People often fit loft insulation incorrectly covering vents etc which makes things worse and often add more to try and rectify it making in worse and the cycle carries on

Condensation problems on windows after air vents put in

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