Hello,
I recently had the roof of my semi-detached house renovated.
The existing rafters, which are 120mm (5 inches) high, were doubled up with 60mm (2.5 inches) battens.
The space between was then lined with a vapor barrier and filled with 180mm (7 inches) insulation wool. On the exterior, a breathable membrane was installed over that.
After the work was completed, I went up to the attic to tidy up and noticed that the blue vapor barrier and the actual insulation were not installed all the way down to the lower edge of the rafters in some areas (see photo). The insulation wool, being tightly compressed, is already causing the membrane to tear near the staples in some places.
Should I be concerned about the torn staples?
How much might the insulating effect be reduced due to the varying compression of the insulation wool between the rafters?
And most importantly, is there a risk of warm indoor air condensing between the rafters and the membrane?
Regards, Norbert
The roof was newly insulated on March 25, 2012, by a master roofer company.
I recently had the roof of my semi-detached house renovated.
The existing rafters, which are 120mm (5 inches) high, were doubled up with 60mm (2.5 inches) battens.
The space between was then lined with a vapor barrier and filled with 180mm (7 inches) insulation wool. On the exterior, a breathable membrane was installed over that.
After the work was completed, I went up to the attic to tidy up and noticed that the blue vapor barrier and the actual insulation were not installed all the way down to the lower edge of the rafters in some areas (see photo). The insulation wool, being tightly compressed, is already causing the membrane to tear near the staples in some places.
Should I be concerned about the torn staples?
How much might the insulating effect be reduced due to the varying compression of the insulation wool between the rafters?
And most importantly, is there a risk of warm indoor air condensing between the rafters and the membrane?
Regards, Norbert
The roof was newly insulated on March 25, 2012, by a master roofer company.
This appears to be an exterior roof renovation. The vapor barrier membrane was installed in a "valley and ridge" pattern. In my opinion, the workmanship is inadequate. The membrane must lie completely flat against the rafters. Therefore, it should be fixed either with battens or with a special adhesive. At the gaps, there is a risk of moisture buildup. The spaces between the rafters must be fully filled with insulation.
Regards
Regards
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