eamonn123456
Registered User
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- 483
I got my attic pumped with rockwool to 300mm, 11 weeks ago.
I noticed that a mirror in the attic was showing signs of condensation.
I decided to wait and let things settle down.
I went up there 3 weeks ago and there is still condensation on it.
I also noticed the roof trusses felt clammy.
I checked the rafters and they feel damp, esp on the north facing side, esp up under the felt. The felt does not feel particularly damp. Some of the rafters look slightly black, unless I am being paranoid and imagining it.
I told the installers to make sure not to pump too far down the eaves in order to leave adequate ventilation.
I have timber soffits with no actual vents, but clearly there was adequate ventilation before the installation as the mirror never had condensation on it before.
The attic hatch is just a piece of MDF and was not draught proofed (but I have done this since), so, in fairness, moist air may have been getting up there, and in fairness, the attic should now be colder than before.
Questions:
1. Do I need to retrofit soffit vents?
2. Would draught proofing the attic be enough to stop the problem?
2a. Would the moisture in the attic clear itself in a reasonable time or should I use a dehumidifier? (has cleared a bit in 3 weeks but not fully).
3b. Can anyone recommend a meter to measure the humidity?
3c. What value is the limit of acceptable humidity in an attic space?
3. Should I have some kind of vents high up on the gables or high up on the tiles?
4. Should I expect the insulation people to remedy this problem, seeing I warned them to leave adequate ventilation?
I am not really in a position to clear the eaves as I would end up compressing the blown rockwool and that defeats the purpose.
Thanks for reading this far, any help would be appreciated greatly.
I noticed that a mirror in the attic was showing signs of condensation.
I decided to wait and let things settle down.
I went up there 3 weeks ago and there is still condensation on it.
I also noticed the roof trusses felt clammy.
I checked the rafters and they feel damp, esp on the north facing side, esp up under the felt. The felt does not feel particularly damp. Some of the rafters look slightly black, unless I am being paranoid and imagining it.
I told the installers to make sure not to pump too far down the eaves in order to leave adequate ventilation.
I have timber soffits with no actual vents, but clearly there was adequate ventilation before the installation as the mirror never had condensation on it before.
The attic hatch is just a piece of MDF and was not draught proofed (but I have done this since), so, in fairness, moist air may have been getting up there, and in fairness, the attic should now be colder than before.
Questions:
1. Do I need to retrofit soffit vents?
2. Would draught proofing the attic be enough to stop the problem?
2a. Would the moisture in the attic clear itself in a reasonable time or should I use a dehumidifier? (has cleared a bit in 3 weeks but not fully).
3b. Can anyone recommend a meter to measure the humidity?
3c. What value is the limit of acceptable humidity in an attic space?
3. Should I have some kind of vents high up on the gables or high up on the tiles?
4. Should I expect the insulation people to remedy this problem, seeing I warned them to leave adequate ventilation?
I am not really in a position to clear the eaves as I would end up compressing the blown rockwool and that defeats the purpose.
Thanks for reading this far, any help would be appreciated greatly.