Loft ventillation


Postby tony77 » Fri Feb 20, 2009 5:28 pm

Hi,

We have a roof with a fairly low pitch, and despite soffitt vents being instaled a while back, are suffering from considerable condensation during the cold snap.

I have had two roofers over to the visit the property, an 1885 brick built semi detached house.

One has recommended the installation of 6 tile vents costing around £425. The second reckons we need around 15 to adequately ventillate the roof at a cost of around £750-£800. There's early evidence of wet rot so we need to move quite quickly now to sort the problem out. There's quite a difference between 6 and 15- is the second one trying it on, or will the first quote prove insufficient? The house is three bedrooms- the neighbours on the other side also seem to get some condensation and already have some vents.

Any help much appreciated.

Tony77
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Postby htg engineer » Sun Feb 22, 2009 9:05 am

Do you have any water tanks in the loft ? if you do make sure they have lids on - this can often be the cause of a condensation build up in the loft.

As for the loft vents - i'm no expert but 6 vents seems plausible, 15 seems OTT - try posting in roofing section.


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Postby tony77 » Sun Feb 22, 2009 8:47 pm

Thanks, will do, there's no water tank in there, it appears to be the type of felt that was used to re-do the roof. It apparently is a common cause of sweating.

Will repost in roof.
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