Hi.

During the renovation of the living room, we discovered that the window is likely leaking into the wall.
The chipboard was a little wet in one corner, so I removed it to replace it with gypsum. The outside has vertical paneling and some kind of masonite board as a wind barrier, which feels damp.

The moisture meter shows red.

See attached images; from what I can see, mold has formed in the two upper corners under the windows.

Can I assume that this will dry out if I fix the seal on the window?

The windows are large 2-pane sections that are installed with some kind of wooden strip and some sealing behind it.

Can I reseal this now (-5 degrees) or do I have to wait until it’s above freezing?

And how can I dry out the wood? Because I don’t want to build in the moisture damage.

Then about plastic and old houses, is it enough to use windproofing paper instead of plastic?

Windproofing paper on both sides?

Grateful for answers.

Let me know if any more information is needed.
 
  • Large windows in a living room under renovation, exposed framework showing signs of moisture damage and potential mold; snow visible outside.
  • Moist and moldy wooden window frame discovered during living room renovation, revealing damp insulation and potential leakage issues.
  • Moisture damage and mold on wooden window frame, with exposed insulation and signs of water infiltration in wall cavity, visible during a living room renovation.
  • Yellow wooden facade with large dual-pane windows reflecting the outside environment. Indoor curtains and objects visible through glass. Potential leak issue.
  • Close-up of a window frame with peeling paint and a visible gap, suggesting possible water leakage. Wool insulation can be seen inside.
  • A window showing mold and moisture signs, with visible interior and exterior panels. Renovation tools and materials visible inside for fixing leakage issues.
  • Close-up of a window sill with peeling paint, indicating possible water damage. Insulation material is visible inside the frame.
It looks like there are 3 identical white posts in picture 4 but only the one in the middle has damaged wood/facade underneath. Is there something from above that makes it extra exposed?
 
Hello. A brace for the awnings is there.

But it sounds funny if that would be the culprit in the drama?

I mostly believe that it is poorly sealed at the window. Water rains on it and finds its way in between the outer/inner wall.
 
S
is again built with a window. and they have failed to make it tight. buy mold cleaner if you don't want to tear down more. preferably some long-lasting mold agent. increase the heat and possibly get a dehumidifier.
 
it's probably time to remove the panel on the outside too so it can air out there
don't use plastic, use förhydningspapp instead
 
Thank you for your answers.

I will probably have to replace the damaged parts.

The question is whether I should fix this immediately or wait until spring when the weather is a bit warmer.

I need to seal the window immediately, so what will work temporarily for this now that it's cold?

/Johan
 
Wait until the spring warmth comes Cover with masonite then there can be a bit of air gap in between
although you can loosen the panel a bit already now so it airs out
 
I would have finished the interior with new insulation, plastic sheeting, and gypsum. First, wash the damaged parts with fungicide. Let dry. Seal around the windows from the outside with a sealant that works in the current temperature.

Remove the panel in the spring and check if you've managed to fix the leak. Also, replace the asfaboard with a more interesting material at that time.

Does it smell?
 
No, it doesn't smell, I think.

Most of it has dried up now, it feels like, since I removed the chipboard and insulation.

The "syllen" (is that what it's called, the one at the bottom?) is still damp though.

Will get a fan tomorrow to help with the drying, and we'll see.

My partner's uncle is coming to take a look too, he's a carpenter, so we'll see how it progresses...

Thanks for all the answers.
 
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