Hi,
I live in an old-ish brick veneer house and it does have insulation in the roof, however during the winter here in Canberra (and just this morning), when we've had frosts, I've noticed some small sections of the ceiling plasterboard in random spots are showing signs of condensation, and in one or two spots some condensation is forming enough to drip (in the bathroom).
FYI this happens when we have negative temperature lows (like -4c this morning), and which the relative humidity is 99%, i.e. perfect conditions for condensation.
So my questions are, would these areas of the ceiling plaster showing signs of condensation indicate areas where roof insulation is not properly situated? or under performing for some reason? It is only a few small spots but I'm curious why it would be happening there and not elsewhere if this is not the case. Getting in the roof space is a bit of an ordeal so I just wanted to make sure it is worth my while before doing it.
Also, for areas of the ceiling that are fine, could this mean that there may still be condensation happening in the roof instead, like underneath or throughout the bats where the warmth would be interacting with the cold? or are the bats supposed to be designed for this?
EDIT: I should mention, the house is tiled with no sarking, so I would imagine the roof space ventilation is adequate, but perhaps a passive ventilation fan or two would help? the house is not large, only 100m2 or so. Something like this? https://www.bunnings.com.au/brutus-300m ... k_p0810900
Thanks for any help.