ᐅ Are empty conduits and pull boxes in waterproof concrete (WU concrete) a risk?
Created on: 5 Sep 2019 08:02
N
netzplan
Hello everyone,
We are currently having an extension built onto the existing building. The extension will have a basement and is also intended to be used as living space. The basement area is largely (except for about 50–70 cm (20–28 inches)) below ground level.
The planned construction includes a studded membrane, 12 cm (5 inches) perimeter insulation, and 24 cm (9.5 inches) waterproof concrete with double reinforcement. (Formed and poured on site). A drainage system is also planned. According to the construction company and the architect, empty conduits and junction boxes should not be an issue.
For safety reasons, should I nevertheless avoid using junction boxes and conduits, or insist on an additional protective layer on the outside? Would a bitumen layer possibly be helpful here?
Best regards
We are currently having an extension built onto the existing building. The extension will have a basement and is also intended to be used as living space. The basement area is largely (except for about 50–70 cm (20–28 inches)) below ground level.
The planned construction includes a studded membrane, 12 cm (5 inches) perimeter insulation, and 24 cm (9.5 inches) waterproof concrete with double reinforcement. (Formed and poured on site). A drainage system is also planned. According to the construction company and the architect, empty conduits and junction boxes should not be an issue.
For safety reasons, should I nevertheless avoid using junction boxes and conduits, or insist on an additional protective layer on the outside? Would a bitumen layer possibly be helpful here?
Best regards
netzplan schrieb:
Would you still recommend applying an additional coating, such as bitumen, to the outside of an exterior wall made of waterproof concrete, or would that be counterproductive with waterproof concrete?
(There will be perimeter insulation applied on top)
Do you have groundwater? If not, it’s not necessary. We skipped it ourselves. As an extra precaution, it’s not a bad idea. The myth about water vapor diffusion without bitumen, however, is outdated based on many studies (with at least 20cm (8 inches) thickness, it is sufficient).
By now, I would recommend doing it, since you can also use it as an adhesive for the XPS foam boards. And you can easily do this work yourself with a trowel. Material costs without labor are probably around 1500 euros.
Bookstar schrieb:
As an additional safety measure, it doesn’t hurt.According to the contractor, bitumen is not necessary and is redundant. However, I would feel more comfortable using it, provided it doesn’t have a negative effect on a waterproof concrete structure ("white tank"). A product like WeberSuperflex 10 costs about 100 euros per 30 liters (approximately 7.9 gallons) and would cover around 6 square meters (65 square feet). For the extension, that would mean about 5 to 6 buckets.
Is a primer generally recommended, regardless of whether it's an extension or an existing building?
Thank you. We have still applied the thick coating to the extension, even though the contractor trusts his waterproof concrete and said the coating wouldn’t be necessary.
By the way, I have read a lot of positive feedback about this Superflex 10. However, part of the area had to be coated yesterday. I couldn’t find Superflex 10 anywhere nearby. So, I got the "Sopro KMB 651 Flex-2-K" from a specialist store. How would you evaluate this product? Is it safe to use without concerns? (Especially since the price online is around 70 euros, but I bought the bucket at the store for 40) and I’m a bit worried that the product might be of lower quality.
By the way, I have read a lot of positive feedback about this Superflex 10. However, part of the area had to be coated yesterday. I couldn’t find Superflex 10 anywhere nearby. So, I got the "Sopro KMB 651 Flex-2-K" from a specialist store. How would you evaluate this product? Is it safe to use without concerns? (Especially since the price online is around 70 euros, but I bought the bucket at the store for 40) and I’m a bit worried that the product might be of lower quality.
Similar topics