DIY Doctor

Main navigation

Loft ventillation

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


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.

Rank: Apprentice
Progress to next rank:
Posts: 10
Joined: Fri Feb 20, 2009 5:22 pm


Simply Build It

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.

htg engineer
Rank: Project Manager
Posts: 3256
Joined: Tue May 22, 2007 5:22 pm

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.
Rank: Apprentice
Progress to next rank:
Posts: 10
Joined: Fri Feb 20, 2009 5:22 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics