ᐅ Base plaster waterproofing: what was used and who installed it?

@BauMixx Great description! That's exactly how it should be done. As an addition, you might want to apply the waterproofing slurry 2-3 times in the area of 15cm (6 inches) 🙂

Yes, I meant waterstop for basement waterproofing. One large, heavy bucket was enough and cost a bit over a hundred.
When dry, it looks like bitumen. When wet, it has a grayish sheen as if it contains acrylic. It is also water-soluble when fresh. And yes, of course it can be quite messy. But it spreads well, so no worries. You need to tape off carefully; I like to use a yellow fineliner tape and remove the tape early enough, also avoiding brushing directly into the tape because of the plaster texture. It’s easy to do yourself. Applying it is quick—I needed it to create a clean line at the desired height so it wouldn’t meander too much, and I definitely spent more time on the taping than on one coat. All in all, for an exterior area of about 150 m² (1,615 sq ft) of the base slab, I spent around 3–4 hours preparing and a bit less for each coat. I worked at a relaxed pace. I don’t align the top edge using a laser level against the terrain but follow the color separation line between the base render and the rest of the plaster to avoid a crooked appearance.

Now for application: Water won’t immediately penetrate if you can leave it open until spring because base render is designed for plinths and should seal well. Of course, it would need cleaning before painting in spring. Maybe it helps if you look specifically for materials that can handle the current temperatures. Alsecco has technical advisors you can contact. A good site manager would be helpful too.

If everything must be done before Christmas, I would definitely subcontract it because of warranty issues at this outside temperature.

Best regards,
Gabriele

fach1werk schrieb:

Yes, I meant waterstop basement waterproofing. One bucket (large and heavy) was enough and cost a little over a hundred something. When dry, it looks like bitumen. When wet, it has a grayish sheen, as if acrylic is mixed in. It’s also water-soluble when fresh. And yes, of course, it can be messy. But it spreads well, no worries. You have to tape carefully—I like to use yellow fineliner tape—and remove the tape early, also avoid brushing directly into the tape because of the plaster texture. It’s easy to do yourself. The painting itself is quick; I spent more time on the height line to keep it from wandering and on taping than on one coat. Overall, for about 150 sqm (1,615 sq ft) of foundation slab around the edge, I spent approximately 3–4 hours preparing and a little less for each coat. I worked at a relaxed pace. I don’t align the upper edge with a laser level or water level relative to the ground but follow the color separation line between the base plaster and the rest of the plaster. Otherwise, it looks crooked.

Still to be applied: Water won’t immediately seep in if you can leave it exposed until spring, since base plaster is designed for the plinth and is actually sealing as well. Of course, it would need to be cleaned before painting in spring. Maybe it helps if you specifically look for materials that can handle the current temperatures. Alsecco has technical consultants you can call. A good site manager would also be helpful.

If everything must be finished before Christmas, I would definitely subcontract it due to warranty issues at these outside temperatures.

Best regards,
Gabriele

Hi Gabriele,
Thanks for your detailed response.
I just received a quote: 204€. It was probably cheaper for you three years ago.
Do you have any site managers from Bad Rappenau?
If I remember correctly, you also had issues/warranty claims with Heinz von Heiden?

Our site manager is no longer with Heinz von Heiden. It still gives me the creeps today.

Yes, we had long-standing difficulties and only finished settling the final payments a few weeks ago. In two cases, we had to initiate evidence preservation procedures, which was hard to understand as they should not have been necessary. The house never really felt like my own because of the years of ongoing issues.

Best regards
Gabriele

Direct sales from Alsecco are very friendly. I was able to negotiate a bit. Now one bucket costs just under 185€.

@fach1werk:
I plan to only coat the retaining wall area for now. The landscaper has already ordered the retaining wall and wants to start soon. So I have to do it now. Thanks for the tip about the temperature.

Sorry, I have a few more questions:

- According to the datasheet, it is green to brown when wet and black when dry. Do you like the black color?
- If I understand correctly, did you apply it directly onto the base coat (Armatop Carbon)?
- I plan to coat the blue area. What do you think about that?
(The tapered insulation boards will still be skim-coated by the plasterer.)
- According to my calculation with two coats, we have 50m2 (540 ft2). According to Alsecco, one 25kg (55 lb) bucket covers exactly that. How many coats did you apply? I am considering just ordering two buckets (to be on the safe side).

THANK YOU for the information and experiences. I wish you a pleasant evening.

I also applied only two well-dried coats. They were applied directly onto the pigmented base render.
No, I didn’t find the black paint aesthetically pleasing. However, it can be covered with a paint matching the color of the base render.
I set the height a few centimeters above the splash guard. The splash guard is a gravel strip with a firm garden-side boundary. Our house is located on a level plot, so unfortunately I cannot offer an opinion on your blue area.
What you order in excess will likely have to be discarded after the winter.

Best regards,
Gabriele