How to seal pipes or entire openings

Help, there are so many different products from Sikaflex, which one do I need :)

Sikaflex®-221 RLT should be the right choice for your application. Clean the pipes before applying and make a plug. Crumpled paper is sufficient for that.

Please ask yourself once again why you want to "seal" that!

Based on the empty conduits, this seems to be a new building? The pipes lie on the base slab under the screed. The covering seems to be click cork or similar. Everything that comes through the base slab or a pipe entry also comes through the screed perimeter insulation strip, if in doubt?

The building is already 10 years old, but the pipes have remained the same :)



The mentioned pipe (in the picture 2 pipes running along the wall to the left and segmented) goes on the ground to the exterior wall, along the wall upwards, then through the wall at a height of 1 meter, along the exterior insulation back down to the ground into the soil and then runs several meters underground.

2 scenarios are swirling in my head:

1. Radon simply passes through the pipe into the room.
2. Or the screed is not connected to the floor slab in the area of the FX pipe and radon can rise between the edge insulation strip and the wall.

For scenario 1, I would only have to seal the pipe.
For scenario 2, I would have to seal the entire area between the edge insulation strip and the screed? In the whole room?

For scenario 1, I would only need to seal the pipe. For scenario 2, would I need to seal the entire area between the edge insulation strip and the screed? In the whole room?

Before this is misunderstood. I do not want to recommend sealing the edge insulation strip as well. Try to question this logically. A hazardous substance (Radon?) is supposed to enter the room through a possibly defective pipe at about 1 meter height from outside, pass through the pipe, and then escape again at floor level or under the screed? Of course, the screed is not connected to the base slab or wall, but is a floating screed. Even if it were connected to the wall and floor, how should the screed stop something that the pipe and/or base slab could not stop? If you have concerns/worries, whether realistic/founded/unfounded, get someone to measure pollutants like Radon. Then you have certainty. If there actually is something, you will know the specific contamination and can respond sensibly together with a professional.

I am doing a long-term measurement anyway, but it lasts half a year. I thought that I could already achieve something with simple means. Besides, the result of the long-term measurement only tells me whether there is a problem, not exactly where.

I did not assume that the gas passes through the floor slab but that it comes through the pipe onto the floor slab and spreads.