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- 14 Dec 2022
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Have a flat roof dormer which is developing damp patches during this cold weather and cracking in the ceiling - assume this is where the PB joints are but some water is dropping down slowly. It’s foil backed PB and there’s an air gap between the OSB and Kingspan inside the rafters driven by vented soffit on the front . We have 4 downlights and the builders put rock wool there but when the lights were installed this has been pushed up and not put back.
I’ve pulled the lights down to have a feel and you can feel some air and also moisture / droplets are visible.
To try avoid taking some PB down to do a more intrusive fix, would a solution be:
Interestingly the en-suite ceiling isn’t leaking through but assume that’s down to the different paint used as you can feel damp when pull those downlights down and again see the droplets.
Builders coming back next week but any advise / suggestions would be most welcome!
I’ve pulled the lights down to have a feel and you can feel some air and also moisture / droplets are visible.
To try avoid taking some PB down to do a more intrusive fix, would a solution be:
- remove rockwool completely so the airflow is restored but this allows warm air below up so will condense more (unless the increased airflow mitigates this)
- Push rockwool down so lights are covered fully so most of the warm air is stopped from rising and condensing
- Add fascia vents to increase airflow alongside existing vented soffit?
Interestingly the en-suite ceiling isn’t leaking through but assume that’s down to the different paint used as you can feel damp when pull those downlights down and again see the droplets.
Builders coming back next week but any advise / suggestions would be most welcome!