K
kasimir_826 May 2020 11:19Hello,
I have a question regarding my rental apartments.
In the rental units, I occasionally find mold spots at the locations circled in red in the picture for some tenants. Several apartments across multiple buildings face this issue, with about 4 out of 12 currently affected.
The exterior wall is a 30cm (12 inches) clay wall, plastered on the outside and painted 5 years ago. There is no additional insulation.
As shown in the picture, the construction promotes mold growth because the windows and doors face each other, and there is no air circulation in the rear corners.
From what I have read, the high indoor humidity caused by activities like sleeping, combined with warm air from heating and the cold exterior walls, causes condensation, leading to mold formation.
Regarding my idea:
Would it be beneficial to install an interior stud wall with insulation, a vapor barrier, and plasterboard on the exterior walls?
My hope is that the heating pipes running between the exterior wall and the new stud wall (shown in green in the picture) would create a warm insulating layer.
This could reduce mold growth and slightly lower heating costs. Given the room layout, I probably won’t be able to completely eliminate the problem if tenants ventilate or heat incorrectly. However, I want to at least ensure that normal ventilation and heating are sufficient.
A full exterior wall insulation is currently not possible for economic reasons.
I have a question regarding my rental apartments.
In the rental units, I occasionally find mold spots at the locations circled in red in the picture for some tenants. Several apartments across multiple buildings face this issue, with about 4 out of 12 currently affected.
The exterior wall is a 30cm (12 inches) clay wall, plastered on the outside and painted 5 years ago. There is no additional insulation.
As shown in the picture, the construction promotes mold growth because the windows and doors face each other, and there is no air circulation in the rear corners.
From what I have read, the high indoor humidity caused by activities like sleeping, combined with warm air from heating and the cold exterior walls, causes condensation, leading to mold formation.
Regarding my idea:
Would it be beneficial to install an interior stud wall with insulation, a vapor barrier, and plasterboard on the exterior walls?
My hope is that the heating pipes running between the exterior wall and the new stud wall (shown in green in the picture) would create a warm insulating layer.
This could reduce mold growth and slightly lower heating costs. Given the room layout, I probably won’t be able to completely eliminate the problem if tenants ventilate or heat incorrectly. However, I want to at least ensure that normal ventilation and heating are sufficient.
A full exterior wall insulation is currently not possible for economic reasons.
N
nordanney6 May 2020 13:00I am familiar with this topic from my own rental experience. We insulated from the inside using calcium silicate boards (professional company). With drywall, you really lose a lot of space for the tenants—and whether it even works properly (dew point shift) is another question. The results so far have been so-so, but definitely a noticeable improvement.
K
kasimir_826 May 2020 14:24What did you do to the panels? According to the panel specifications, textured wallpaper is not suitable. Only fiberglass wallpaper or breathable coatings are allowed. Does that mean I would also need to repaint or cover the interior walls?
Replacing the windows would almost be my last option. The construction work in an occupied unit is quite extensive. That would only be considered as part of a full renovation of the property.
A painter I know suggested using paint with fungicide.
Replacing the windows would almost be my last option. The construction work in an occupied unit is quite extensive. That would only be considered as part of a full renovation of the property.
A painter I know suggested using paint with fungicide.
N
nordanney6 May 2020 14:38kasimir_82 schrieb:
What did you apply to the panels? According to the panel description, a textured wallpaper is not suitable. Only fiberglass wallpapers or breathable (vapor-permeable) paints are allowed. Does that mean I would have to repaint or re-cover the interior walls as well? If you’re going to renovate, do it properly.
To be honest, I have no idea what was applied over the insulation. I just approved the order through the property management. I believe it was only painted.
Installing a decentralized ventilation system?
We are planning to install one in an apartment. It will require six core drillings, six devices, plus a control unit. Each device only needs an individual power connection. We will carry out the installation while the apartment is unoccupied, but the floors will remain in place. If necessary, it could also be done while occupied, provided the core drilling is done very carefully.
The estimated cost is around 3,200.
We hope this will solve the problem of mold stains in the corners of the house on the north side.
Regards,
Specki
We are planning to install one in an apartment. It will require six core drillings, six devices, plus a control unit. Each device only needs an individual power connection. We will carry out the installation while the apartment is unoccupied, but the floors will remain in place. If necessary, it could also be done while occupied, provided the core drilling is done very carefully.
The estimated cost is around 3,200.
We hope this will solve the problem of mold stains in the corners of the house on the north side.
Regards,
Specki
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