The house is old, but the attic is new ... and a bathroom will be installed there.
The 6.5 cm (2.6 inches) thick screed lies on top of a polystyrene impact sound insulation with a membrane that was also used to secure the underfloor heating pipes.
Here you can see a spot where the screed is not yet complete (a level-access shower will be installed there).
The green plastic foam strip will be removed, and the floor – extending up the walls – will be covered with a waterproof membrane so that any moisture penetrating through the tiles cannot seep INTO the floor.
So far, everything is as it would normally be.
Because I learned here on the forum with surprise that there is a swelling paste which significantly expands when exposed to moisture, sealing joints in the process, I think it would be clever to fill the empty space left when the plastic foam strip is removed with such a paste. That way, if the second waterproofing barrier (1. tiles, 2. waterproof membrane) fails, there would still be a third seal that actually becomes tighter when water arrives (a great system).
Any water potentially passing through would then not run under the screed ... and I think that would be great 😎
Strangely, the descriptions of the "Betonit swelling paste" (found under this name online) do not explicitly mention this use, which puzzles me because it seems obvious, and a company would usually promote such an advantage if it could.
Is there anyone here who knows "Betonit swelling paste" and can confirm or refute my theory?
Best regards,
Wolfgang
The 6.5 cm (2.6 inches) thick screed lies on top of a polystyrene impact sound insulation with a membrane that was also used to secure the underfloor heating pipes.
Here you can see a spot where the screed is not yet complete (a level-access shower will be installed there).
The green plastic foam strip will be removed, and the floor – extending up the walls – will be covered with a waterproof membrane so that any moisture penetrating through the tiles cannot seep INTO the floor.
So far, everything is as it would normally be.
Because I learned here on the forum with surprise that there is a swelling paste which significantly expands when exposed to moisture, sealing joints in the process, I think it would be clever to fill the empty space left when the plastic foam strip is removed with such a paste. That way, if the second waterproofing barrier (1. tiles, 2. waterproof membrane) fails, there would still be a third seal that actually becomes tighter when water arrives (a great system).
Any water potentially passing through would then not run under the screed ... and I think that would be great 😎
Strangely, the descriptions of the "Betonit swelling paste" (found under this name online) do not explicitly mention this use, which puzzles me because it seems obvious, and a company would usually promote such an advantage if it could.
Is there anyone here who knows "Betonit swelling paste" and can confirm or refute my theory?
Best regards,
Wolfgang
B
Benutzer20011 Feb 2022 14:32ateliersiegel schrieb:
It is said that flat roofs last 15 years and then need to be redone.Who says that? Because that statement is simply nonsense.ateliersiegel schrieb:
Most of our bridges in Germany are made of concrete (like the dome of the Pantheon), they need to be renewed and are not even 100 years old.ateliersiegel schrieb:
And I like the idea of building for eternity.It’s all a matter of use and maintenance. If you take a bridge from the 1960s, it was built for the loads of the 1960s. If you buy a pair of shoes and only want to wear them on weekends, don’t be surprised when they’re worn out after a second marathon and three months later.Houses – no matter how they are built – last for eternity. Just walk through old town areas. These buildings have nothing to do with modern materials but still don’t get “old” because they are maintained.
ateliersiegel schrieb:
My question is whether the paste would technically work.
Probably only someone who has already worked with it can answer that for me.You won’t find anyone here, because this paste is not used in private applications. And for good reason – it is simply not necessary.
I tried to find a technical datasheet. Unfortunately, the website only has certificates in Czech.
At least, I would want to verify whether it truly has all the properties you expect and whether it might also have additional characteristics that could be harmful for your intended application.
Based on the examples and photos on the website, I would say probably not. It all appears to be designed for much rougher applications (structural shell). The swelling effect might even be too strong, potentially causing the joint to burst and the tiles to come loose.
At least, I would want to verify whether it truly has all the properties you expect and whether it might also have additional characteristics that could be harmful for your intended application.
Based on the examples and photos on the website, I would say probably not. It all appears to be designed for much rougher applications (structural shell). The swelling effect might even be too strong, potentially causing the joint to burst and the tiles to come loose.
Addendum: So, I believe what you want is a durable, low-maintenance waterproofing, which is fully achieved by a liquid applied membrane. The only factors that can compromise this are poor workmanship and UV exposure. At least the first you can partly control. The second does not apply in your case since there will be another layer above, and hopefully, the sun will never shine underneath it.
ateliersiegel12 Feb 2022 06:47Tolentino schrieb:
whether it really has all the properties you expect from it, and not maybe some additional properties that could even be harmful for your intended application.Yes, that’s exactly what I’m trying to find out. As it currently stands, the "swelling paste test" will not take place because I don’t have enough information yet (I’m still asking around—so far without results—from other people …)