White spots on wood fiberboards above the rafters

  • Erstellt am 2021-12-02 16:14:31

Wolfgang2002

2021-12-02 16:14:31
  • #1
Hello everyone,
we have been living in our low-energy house for 12 years. For 3 days, there has been a musty smell in a room facing north. I just climbed onto the roof and looked under the tiles to see how the wood fiber boards look. There are white spots everywhere, and I don’t know what they are. Hopefully, it’s not mold.
The roof is constructed as follows:
Plasterboard on batten framework
Vapor barrier
Rafters
Insulation between the rafters with space for ventilation
On top, wood fiber boards
and finally a "foil"
Battening
Concrete tiles
Can anyone tell me what these spots are?

Thank you very much and best regards
Wolfgang
 

tomtom79

2021-12-02 16:17:51
  • #2
That is definitely mold. Do not ignore it and look for the cause; something is leaking somewhere.
 

hampshire

2021-12-02 17:13:05
  • #3
My layman’s guess is also mold. Since you apparently are not a professional in this matter, I would get help in searching for a leaking spot and have it determined whether the cause lies in shoddy construction.
 

tomtom79

2021-12-02 17:17:38
  • #4
After 12 years and still white mold, I rather suspect that something was changed, perhaps retroactively a photovoltaic system or a defective roof hatch, etc.
 

Wolfgang2002

2021-12-02 17:26:53
  • #5
Nothing has been changed. I am surprised that the infestation is spread over the entire, rather lower half of the roof. If there were a leak in the vapor barrier, wouldn’t the infestation be more localized? The vapor barrier was properly sealed and has no holes.
 

Wolfgang2002

2021-12-02 17:27:53
  • #6
Thanks by the way for your answers
 

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