The roof was poorly insulated (photos)

  • Erstellt am 2012-04-09 07:58:47

Tucon

2012-04-09 07:58:47
  • #1
Hello,
I have just had the roof of my semi-detached house renovated.
The existing rafters, which are 120mm high, were doubled up with 60mm high battens.
Then the gap was lined with a vapor barrier and filled with 180mm of insulating wool. From the outside, a breathable roofing membrane was then applied.

After the work was completed, when I went up to the attic again to tidy up, I saw that the blue vapor barrier and the actual insulation were partially not installed up to the lower edge of the rafters (see photo). The insulation wool, which is thus placed quite under tension, is already causing the foil to tear near the staples in some places.

Should I be worried about the torn staples?
How much worse might the insulation effect be now, considering the different packing density of the insulating wool between the rafters?

And mainly, can warm indoor air condense between the rafters and the foil?

Regards, Norbert
The roof was newly insulated on 25.03.2012 by a

master roofing company.



 

S.D.

2012-04-09 09:51:29
  • #2
It is apparently an exterior roof renovation. The vapor barrier membrane was installed in a "ridge and valley" pattern. In my opinion, the workmanship is poor. The membrane must be completely attached to the rafters. Therefore, it must be fixed either with roofing battens or with a special adhesive. At the defective spots, there is a risk of moisture forming. The rafter bays must be completely filled with insulation.

Regards
 

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