ᐅ Damp spots on exterior masonry

Created on: 14 Nov 2021 21:27
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SuahUab
Hello everyone,

Certain spots on the exterior masonry of our house are consistently damp. Recently, these wet areas have also become visible on the inside walls. They do dry out during extended dry periods but always reappear when it is humid or rainy. The flat roof is already insulated and fully covered, with only the parapet still missing. I’m not sure whether the issue is related to the roof or the masonry. Do you have any advice on what might be causing this?

We plan to start with the exterior rendering soon, but I believe action is needed before that.

I appreciate any feedback or tips.

Best regards,
Michael

Unverputzte Betonfläche mit losem weißen Kabel, das an einer Klemmhalterung hängt.


Außenwand-Baustelle: rote Ziegel, Dämmplatten, weiße Platten, Blaufolie, Fenster unten links


Ziegelbau-Fassade mit zwei dunkel gerahmten Fenstern, Bauarbeiten sichtbar


Außenfassade aus roten Ziegeln mit offener Tür unten und Fenster oben, Wolkenhimmel.
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SuahUab
15 Nov 2021 14:54
So, am I correct in understanding that the stains should not reappear once the flashing of the parapet is installed?

Thank you for your help and support!
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SuahUab
27 Nov 2021 20:19
The parapet cover has not been installed yet but is planned to be done soon.
Currently, the screed inside is drying, and there is scaffolding up again.
When I was at the house today, I noticed many water droplets on the ceiling exactly where the outside also shows wet spots.
I am worried that the filled concrete block might be developing mold. What do you think?

Moist concrete walls in a corner with dark water stains and mold.


Damp concrete corner with many small water droplets along the edge.


Corner of two concrete surfaces; many small water droplets on dark surface above.


Gray flexible conduit hanging from a ceiling opening in an unfinished room.


Orange measuring device from Brennenstuhl with display, showing 29.3% RH in front of a red brick wall.
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Snowy36
28 Nov 2021 09:55
Please consult an expert, preferably from the IHK list... for a question like this, you won’t have to pay much and you will get a qualified opinion... I wouldn’t just cover it with a sheet metal without knowing what’s going on. It won’t be solved simply by adding a sheet metal...
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driver55
28 Nov 2021 12:10
Oh my goodness. That looks terrible. You don’t even need a measuring device for that. Get the general contractor/site manager to the construction site right away and, as already suggested, bring in an expert.
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Nice-Nofret
28 Nov 2021 13:31
... and have the covering sheets made with the longest possible drip edge
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Pumpernickel1
16 Dec 2021 23:51
SuahUab schrieb:

The parapet cover has not been installed yet but is expected to be done soon.
Currently, the screed is drying inside, and scaffolding is back in place.
When I was in the house today, I noticed a lot of water droplets on the ceiling exactly where the outer wall also shows wet spots.
I’m concerned that the hollow block might be developing mold. What do you think?

What has come of this? Have you consulted a building expert?