ᐅ Concrete slab and house protected against moisture with dimpled membrane? Any experiences?
Created on: 21 Jun 2025 23:04
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Bauherrin123
Hello dear homeowners,
Who has experience and can help me? I have been living in the house for 2 years, and now it’s time to work on the exterior landscaping. We have now installed dimpled membrane (drainage membrane) for the terraces, but it already seemed wrong to me. I have since read up on it and am still unsure. Did my construction company deliver a house without properly waterproofing the exterior or what?
The house has no basement. A neighbor said the company applied bitumen and then a slurry coat, and that would be sufficient. Additionally, we are installing the dimpled membrane, which should be more than enough.
Now I don’t know if the dimpled membrane was installed correctly, if the company really applied bitumen, and if everything we're doing is enough — or if we should call a specialist? Attached is a photo; I am totally confused. What do I need to do to protect my house from moisture and damage for the next 10 years? I don’t want to forget anything, as everyone says something different: One road construction worker offers to do it for 150 euros, saying he will remove the gravel, apply the slurry coat, and install the dimpled membrane with the dimples facing the wall. Another person says it would cost 5,000 euros and that there needs to be insulation, then a layer – I don’t know what exactly – then styrofoam, and then the dimpled membrane with drainage.
I am confused.
Who has experience and can help me? I have been living in the house for 2 years, and now it’s time to work on the exterior landscaping. We have now installed dimpled membrane (drainage membrane) for the terraces, but it already seemed wrong to me. I have since read up on it and am still unsure. Did my construction company deliver a house without properly waterproofing the exterior or what?
The house has no basement. A neighbor said the company applied bitumen and then a slurry coat, and that would be sufficient. Additionally, we are installing the dimpled membrane, which should be more than enough.
Now I don’t know if the dimpled membrane was installed correctly, if the company really applied bitumen, and if everything we're doing is enough — or if we should call a specialist? Attached is a photo; I am totally confused. What do I need to do to protect my house from moisture and damage for the next 10 years? I don’t want to forget anything, as everyone says something different: One road construction worker offers to do it for 150 euros, saying he will remove the gravel, apply the slurry coat, and install the dimpled membrane with the dimples facing the wall. Another person says it would cost 5,000 euros and that there needs to be insulation, then a layer – I don’t know what exactly – then styrofoam, and then the dimpled membrane with drainage.
I am confused.
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Bauherrin12322 Jun 2025 23:36nordanney schrieb:
You can’t really see anything. That’s why I’m thinking this through. KMB waterproofing is fine. So the only thing left is the door.
1. Ask an expert (what exactly did they do during construction?)
2. Check if the door was properly sealed (this is also part of point 1)
3. Install dimpled membrane (drainage membrane) in front of the wall.
4. Backfill and landscape the garden.Honestly, the inspector was mostly just trying to scare the developer; he did his job, but he wasn’t really very thorough. I contacted him, but I already know he’ll say this is the landscaping, so it’s up to the landscaper or something like that.
Could it be that I’m overthinking this and it’s not such a big deal? Is an additional drainage system really necessary?
Now someone is telling me that it would be better to use Delta Terrax. So nothing has gone wrong yet, but I should definitely add extra waterproofing. That means I should remove the existing membrane and use Delta Terrax instead, simply sticking it on.
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Bauherrin12322 Jun 2025 23:38nordanney schrieb:
3. Dimple membrane in front of the wall.
4. Backfilling and landscaping Can you simply use dimple membrane and backfill without sealing them? Is it necessary to glue the membrane, install drainage, or seal the top? Which side of the dimple membrane should face which way… I’m a bit confused about this topic.
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nordanney22 Jun 2025 23:40Bauherrin123 schrieb:
Now someone is telling me that it’s better to use Delta Terrax.Huh, who are you talking to?Oh, Delta Terrax for the load cases you have there and your nonexistent basement?
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nordanney22 Jun 2025 23:43Bauherrin123 schrieb:
Can you just use dimpled membrane and backfill? Does it not need to be glued, no drainage, and does the top not need to be sealed? Which way should the dimpled membrane go... I’m completely confused about this topic Yes, you got it wrong.
The dimpled membrane is for mechanical protection. Nothing is glued. Whether and how drainage is needed is answered by the person who knows and planned the site.
And if you read the answers: dimples facing the wall.
No, it does not get sealed at the top either. Why would it, if the wall is already waterproofed?
First, just take a deep breath. You live in a functioning house, right? So everything happening now is nothing to worry about. Peanuts, as they used to say long ago.
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Bauherrin12322 Jun 2025 23:47nordanney schrieb:
Huh, who are you talking to?
Oh, Delta Terraxx for the load cases known to you and your non-existent basement? I don’t quite understand the text right now—is it not good? Sorry, I’m really confused today.
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