eamonn123456
Registered User
- Messages
- 483
Thanks for the comprehensive reply, ONQ. Some interesting ideas there.
Funny enough, I stuck a dehumidifer and a heater up there this evening! Just as a short term fix.
I don't want to be contradictory, but I am not sure about some of your comments. Having said that I am completely open to correction.
I honestly don't feel that putting in extra venting was a wrong move long term, although short term I suppose it could be. Unfortunately, I don't have an easy way of opening and closing those vents, 2 stories up.
I agree the prob is due to a colder attic space - which was the whole idea of insulation in the first place.
I think putting in vapour control layer (ie new ceilings?) is an expensive option, especially if you reckon that the source of the moisture is the external atmosphere anyway.
I think insulating the rafters is a high risk solution, given that this might hide the problem and lead to unseen rot of rafters.
I wonder would removing the tiles and putting in breathable felt be the answer? I know that's radical and expensive, but I need a solution.
Maybe I should just remove the insulation!
#Thanks again ONQ.
<big snip>
"A total of 20 x 2" diameter vents is nowhere near the equivalent area of a 10mm continuous strip."
That's apples and oranges. To compare them you need to give a rate per linear metre for the incidence of the 2" dia. vents.
I make that 2024 sqmm per vent - which equates to 202.4mm of continuous 10mm vent - you'd need one every 8".
Off the top of my head, I dunno the rate per linear metre etc, but my house is wider than 80", so I still reckon I am not going overboard on the vents......
As regards that Gyproc sealer - would it work on a painted ceiling do you reckon or would it only work on bare Gyproc? I'm thinking only on bare Gyproc.
Thanks lads for the interesting discussion on ventilating the attic.
Is it possible to over ventilate the attic?
I put two vents in the north facing roof which showed no improvement. I think I should have put one on each side?
Hi ONQ,
a couple of things I should clarify / respond on:
My house is not 80' (feet) wide, just my attempt at humour saying that it is more than 80" (inches) wide.
A rough calculation suggested that my 12 x 2" vents on each side would be adequate for that width (just making the point that I am NOT over ventilating according to what you said).
I don't have any downlighters.
I didn't do home improvements without professional advice - I used a well known professional company to carry out the insulation work. They did indeed insulate the pipes, around the tanks (not under) and put a lid on them.
However, they did not give any advice regarding ventilation or vapour control, which one may say with hindsight was negligent, but to be honest I would imagine that almost all of the installers of insulation who are doing thousands of installations each year in Ireland would not address this either.
Finally, of course I understand that internet advice is unpaid advice, and is sometimes worth every penny, so I would never rely on it alone.
But of course it is often helpful, as in this case, for which I am grateful.
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