Moisture in the attic

muganj

I have always suffered moisture build up in the attic, but it has become very bad since i had the wall and attic insulated. It is most apparent in cold weather when the moisture droplets pool on drip constantly from the inside of the roof.

I imagine the ventilation could be in proved but the eves do not appear to be blocked by the new insulation

Any advice

Thanks

liveandnetural

could you post a picture of whats happining or a picture of the attic

a few questions for you
what age is the house
what is the roof constructed of(slate tile )
is there a roofing membrane ?
any bathroom fans exaustiing warm moist air into the attic
is you attic trap door well sealed

teepee

ventalation of sure , as roof allway get calls in the hard frosty weather . to install vents in old roofs especially where there is sparkling felt used , or there its hard to get to the roof you could bore a 100mm hole at either end of the house at the galble end , allowing for the movement of air with a vent grill externaly with stainless steel fly mesh .
Teepee .

AMG86

Have a look at where the insulation ‘meets’ the roof. There should be a gap.

Carlow52

muganj wrote: »

I have always suffered moisture build up in the attic, but it has become very bad since i had the wall and attic insulated. It is most apparent in cold weather when the moisture droplets pool on drip constantly from the inside of the roof.

I imagine the ventilation could be in proved but the eves do not appear to be blocked by the new insulation

Any advice

Thanks

from here:
http://www.commercialconnections.co.uk/Content/building_standards/BS5250%20-%20Code%20of%20Practise%20for%20condensation%20in%20buildings.pdf

<Pitched roofs with a large void above the insulation are subject to diurnal temperature cycles, particularly
in clear, calm weather. On clear nights, radiation to the sky can cause the temperatures of the roof covering
and of the underlay to fall to several degrees below those of outside air and of air in the loft. Condensation
may then form on the underside of the covering and of the underlay.>

The link is to the full BS5250 Code of practice for
control of condensation
in buildings
well worth a close read

muganj

Apologies Live and Neutral for my delay in getting back to you

what age is the house - 1996
what is the roof constructed of(slate tile ) - Tiles
is there a roofing membrane - Yes, Felt like
any bathroom fans exaustiing warm moist air into the attic - Not any more !
is you attic trap door well sealed - Yes

It recently had the extra insultaion installed. It is musty up there all the time now.

A 100mm hole through the cable ends if a big job. Would i achieve any air movement if i increased the number of vent holes in the fiscia board ?

Thanks
John

muganj

I drilled a 4.5" hole in the Gable end wall and now there is nice fresh air up there.

Be carefull drilling into the Cable end not to attempt this too close the apex as these blocks are more likely to come loose as they lack support

John