ᐅ Styrodur Perimeter Insulation – Capillary Action on the Reinforcing Mortar?

Created on: 6 Jan 2018 08:04
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Username_wahl
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Username_wahl
6 Jan 2018 08:04
Hello,
I applied reinforcement mortar over the exposed Styrodur of the perimeter insulation for UV protection. Now, after prolonged rain, the following pattern of strip-like dampness has appeared.

Is this caused by splash water, or is it being absorbed from below?
The latter would be very problematic.

As far as I remember, it is
SAKRET adhesive and reinforcement plaster,
and the product description states
for interior and exterior use, water-repellent

Problem: A conservatory with a wooden substructure is planned to be built onto this. Rising damp would be fatal. :-(

Exterior wall with plaster residues, soil, and orange drainage pipe at construction site
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Username_wahl
7 Jan 2018 10:56
Anyone have any ideas?

How can you remove this stuff without damaging the surface beneath?

What would be suitable instead for filling/smoothing/rendering?