Hello,
I have a problem that is keeping me awake at night.
The house is a semi-detached from 1976. In spring, I gutted the converted attic and have been working on the rebuild since then. I insulated the sloped roof as follows: roof tiles on battens, 20 mm (0.8 inches) air gap, underlay membrane, 180 mm (7 inches) mineral wool insulation between the rafters, high-performance vapor barrier, 50 mm (2 inches) insulation below the rafters.
I had insulation blown into the 50 mm (2 inches) cavity in the gable wall.
Now to the main problem. Between the last rafter and the gable wall there is about an 80–100 mm (3–4 inches) gap. This is filled with sand-lime bricks laid in a stepped pattern. I stuffed mineral wool in there as best as I could. Unfortunately, I can’t see how thick the insulation ended up being, probably only a few centimeters. However, moisture is now forming in these corners on the vapor barrier. A friend advised me to add about 100–150 mm (4–6 inches) of insulation from the inside directly on the vapor barrier in the corners.
I did this as well. Currently, it’s not very cold outside, yet I have the impression that moisture is still forming under my corner insulation on the vapor barrier.
What else can I do? I would really appreciate any advice.
I have a problem that is keeping me awake at night.
The house is a semi-detached from 1976. In spring, I gutted the converted attic and have been working on the rebuild since then. I insulated the sloped roof as follows: roof tiles on battens, 20 mm (0.8 inches) air gap, underlay membrane, 180 mm (7 inches) mineral wool insulation between the rafters, high-performance vapor barrier, 50 mm (2 inches) insulation below the rafters.
I had insulation blown into the 50 mm (2 inches) cavity in the gable wall.
Now to the main problem. Between the last rafter and the gable wall there is about an 80–100 mm (3–4 inches) gap. This is filled with sand-lime bricks laid in a stepped pattern. I stuffed mineral wool in there as best as I could. Unfortunately, I can’t see how thick the insulation ended up being, probably only a few centimeters. However, moisture is now forming in these corners on the vapor barrier. A friend advised me to add about 100–150 mm (4–6 inches) of insulation from the inside directly on the vapor barrier in the corners.
I did this as well. Currently, it’s not very cold outside, yet I have the impression that moisture is still forming under my corner insulation on the vapor barrier.
What else can I do? I would really appreciate any advice.
H
Hanseatic31 Dec 2011 16:50Since it is working out so well, here is another one.