ᐅ The plaster has discolored and is peeling off.

Hi @jcan – the issue is currently visible only around the reveal area.

I suspect it is caused by rising damp. Water has likely run down between the door threshold and the paving slabs. Since the ledge for the concrete slab is located there (which is sealed at that spot), I think the water has collected there and, once in sufficient quantity, gradually pushed the plaster upwards from the side.

The joint between the concrete slab and the plaster was probably not additionally sealed, which is likely where the damage has occurred.

At the moment, moisture measurements on the wall have not shown elevated levels. So I currently assume the dampness is only superficial.

I’ve also attached a photo from another part of the house (patio door) to show the transition between the concrete slab (which appears to have a membrane) and the house (or plaster). You can see at the corner beneath the window frame that this joint between the plaster and wall assembly seems to be a weak point where moisture can penetrate the plaster.

What do you think about this? Could the problem be permanently resolved by sealing the joint between the plaster and the concrete slab?

Thanks for your feedback
Andreas

In this situation, I would probably just seal the corner area and see what happens. Ideally, you would ensure that no water can accumulate there, basically by rounding off the corner. However, you might then need a different material.

From a purely practical standpoint, that would be my idea – but it probably wouldn’t comply with standards, right?

jcan schrieb:

In this situation, I would probably just seal the corner area and see what happens. Ideally, you would make sure that no water can remain standing there, basically rounding off the corner. But then you might need a different material again.

I think that once you start following the standards, the costs will increase. However, given the situation, I doubt that it will bring much benefit. If only the reveal area is affected, seal it properly and make sure no water can accumulate in the corner. It’s always difficult to judge from the photos alone. I would initially go with this minimal solution. The current damage in your case isn’t that severe either.
Unfortunately, the close-up photos don’t show enough detail; sometimes a wider shot from a distance would be better.

I’ve now seen that you wrote something in another post. Please consider my personal opinion as it relates to the reveal area.

At least the visible damage.
What is happening underneath cannot be assessed without inspecting below first.

Thank you for your assessment. What makes you think it is not that high?

jcan schrieb:

I think that if you start following the standard, the costs become higher. Whether that actually provides more benefit, I doubt in this situation. If only the reveal area is affected, seal that and make sure no water can accumulate in the corner. From the photos, it is always difficult to judge. I would opt for this minimal solution initially. The current damage in your case is not that extensive.
Unfortunately, the detail photos never show enough; sometimes an overview from a distance would be better.

I noticed you posted something else in another thread. Please consider my personal opinion regarding the reveal area.