We have a lot of drips of water in the attic on the felt underside of the roof, but we have noticed it become damp in the loft since the summer ended. It is a 50's semi, has a vent brick and new insulation has a gap of a foot or so at the either side in the eves. How do we stop this condensation? (I am hoping it is condensation!)
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Condensation in Attic
- Thread starter selmanj
- Start date
On the underside of the felt it will be condensation.
If you are sure you have a good through=flow of ventilation (check that it has not been blocked by flopping insulation) then you need to look at where the humidity is coming from.
Some possibilities:
- Hot water in the loft tanks due to pumping-over or other plumbing fault
- No cover on water tanks in loft
- Steam rising from bathroom due to not using an extractor fan during and after baths and showers
- Excessive humidity in house due to leaving wet washing about the house or
draping it over radiators
- Bathroom ceiling cracked or gappy allowing steam to rise into loft (especially around holes for light fittings, pipe and switches)
- Incorrectly fitted bathroom ventilator or extractor venting into loft
- Badly fitting loft-hatch allowing excessive amounts of warm moist air to rise through gaps.
- Use of "condenser" tumble drier. Most of these allow a lot of water vapour to escape
- Use of vented tumble drier with no hose going outside; or faulty hose
- Use of paraffin heaters or gas fires that do not have a flue
Water vapour is lighter than air, so it rises through the house even more than warm air does. This is why clouds are above us.
If you are sure you have a good through=flow of ventilation (check that it has not been blocked by flopping insulation) then you need to look at where the humidity is coming from.
Some possibilities:
- Hot water in the loft tanks due to pumping-over or other plumbing fault
- No cover on water tanks in loft
- Steam rising from bathroom due to not using an extractor fan during and after baths and showers
- Excessive humidity in house due to leaving wet washing about the house or
draping it over radiators- Bathroom ceiling cracked or gappy allowing steam to rise into loft (especially around holes for light fittings, pipe and switches)
- Incorrectly fitted bathroom ventilator or extractor venting into loft
- Badly fitting loft-hatch allowing excessive amounts of warm moist air to rise through gaps.
- Use of "condenser" tumble drier. Most of these allow a lot of water vapour to escape
- Use of vented tumble drier with no hose going outside; or faulty hose
- Use of paraffin heaters or gas fires that do not have a flue
Water vapour is lighter than air, so it rises through the house even more than warm air does. This is why clouds are above us.
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