ᐅ Facade Paint: Should It Be Applied Once or Twice?

In my opinion, the silicone resin paint makes sense. Although it won’t remain completely free of dirt over the years, it is dirt-repellent, water-repellent, and vapor-permeable. What would be a reasonable alternative? Or is it about the ecological balance if I paint a few square meters of wall with it only once every 15 years?

Buschreiter schrieb:

In my opinion, silicone resin paint makes sense. Although it won’t stay clean over the years, it is dirt-repellent, water-repellent, and vapor-permeable. What would be a reasonable alternative? Or is the question about the ecological balance if I paint a few square meters of wall once every 15 years?

A mineral-based plaster should be finished—not only because it isn’t purely chemical and the lotus effect wears off quickly—with a mineral paint, specifically a silicate paint. It is ecological, bonds with the plaster by silicification, is alkaline and therefore algae-resistant for a very long time, vapor-permeable, and also helps regulate moisture. The only disadvantage is that pure silicate paint is not available in strong colors; for that, you need dispersion silicate paint.

However, the chemical-based silicone resin paint degrades significantly after a few years, and you notice—or rather see—the difference.

One person says it one way, another says it differently… even with colors, there are differences in quality, and a direct comparison on a wall is not possible or desired anyway. 😉

Buschreiter schrieb:

One person says this, another says that… even with colors, there are quality differences, and a direct comparison on the same wall is not really possible or desired 😉

Yes, the quality differences apply mainly to silicone resin paints. It is harder to adulterate pure silicate paint. And if you walk through new housing developments from the 2000s, although you don’t have comparisons on the same wall, you do see many houses standing next to each other. From this perspective (and also based on industry experience) I would personally not place much trust in advertising claims, but rather rely on the experience gathered over the past hundred years. “Back then,” mostly silicate paint was used. And you can tell. Dirty facades (especially in my home region of the Ruhr area) are inevitable everywhere. But those old houses have rarely turned green to this day.

However, this is just a side note. Regarding the original question: Please apply two coats.

Pinkiponk schrieb:

This was neither offered nor discussed with us (prefabricated house with timber frame construction). I don’t even know how many times it was painted. I suppose I should have looked into that.

Oh!? – I seem to recall that back then the focus was on precisely achieving a specific shade of vanilla...

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KarstenausNRW schrieb:

But old houses often have never turned green even today

THIS has nothing to do with the color. Walls that gently release internal heat to the outside are less likely to be favored by algae. Google: algae on ETICS facades Fraunhofer Institute