ᐅ Substrate Preparation for New Construction for (Machine-) Applied Plaster

Hello everyone,

Here is my situation: my house construction is currently in its final phase. It is a solid building (masonry, concrete, and aerated concrete/Porotherm walls) and all surfaces will be finished with a Q2-level skim coat. I want to paint some walls with textured roller paint.

Now I am wondering how to prepare the substrate before applying the textured roller paint.

• Company A (from the hardware store) recommends simply applying a sealing primer with a roller and then applying the textured roller paint. This makes sense and seems fine overall, though opinions on this approach vary.
• Company B (from the Alpine foothills) recommends using a bonding and deep primer before the textured roller paint. However, this company also says that for aerated concrete/Porotherm, a burn-in protection is necessary. This would be a significant additional step for me, and I am unsure if it is really needed on a wall that has already been skimmed to Q2 level.

Company B was used by the painter at my sister’s house, and the result looks great—so they are my favorite. However, I am not fully convinced by their explanation and am uncertain if the burn-in protection is really required. Can you help me here?

Best regards from the Rhineland

dpauso7766 schrieb:

Company B was hired by the painter at my sister’s house, and the result looks great – they are my favorite. However, I’m not satisfied with their statement and am unsure if the fire protection coating is really necessary as an additional step. Can you help me with this?

Did you tell Alpenkalk that you are applying the textured roller plaster on Ytong blocks or on (whatever type of) render? The answer varies depending on that.
Why choose the lime-based roller plaster? I would "only" apply a primer on normally plastered walls (gypsum plaster).

You might also want to check out Haering Deko Quarz elf. It’s also really great – and works perfectly mixed with the appropriate tint. Not comparable to Knauf or other DIY store products.

I simply applied a primer to the plaster and then applied the textured roller finish on top, with no issues.

nordanney schrieb:

You can also check out Haering Deko Quarz elf. It’s really great as well – mixes perfectly with the matching tinting color. No comparison to Knauf or other DIY store products.

I have used it many times and still think it’s excellent. I can definitely recommend it!

Thanks in advance!

nordanney schrieb:

Did you tell Alpenkalk that you are applying the textured plaster (roll plaster) onto Ytong or onto (whatever kind of) plaster? Because the answer differs depending on that.
Why use lime-based textured plaster? I would just apply a primer on a normally plastered wall (gypsum plaster).

You could also check out Haering Deko Quarz elf. That one is also really great – and mixes very well with the appropriate tinting paint. Totally different from Knauf or other DIY store products.

It should be textured plaster because I’m familiar with it. Haering Deko Quarz elf seems like a paintable plaster to me.

Alpenkalk says a bonding and primer coat is usually enough, but with Ytong you would need the fire protection coating. That raises the question whether it is still necessary despite the skim coat. The inquiry to the company was not answered clearly.

Aloha_Lars schrieb:

I just applied primer on the plaster and then put the textured plaster on top, no problems.

Even on Ytong/aerated concrete?

I was just told to use everything from the same manufacturer because then the products are compatible with each other. But for me, the question about the fire protection coating remains.

dpauso7766 schrieb:

It should be rolled plaster since I know how to handle that. Haering Deko Quarz elf seems to me to be a brush-on plaster.

It is simply rolled on as well. A bit more demanding than just rolling paint.