ᐅ Sealing the garage with a concrete floor?

Just ask him again. Maybe others will share their opinions here as well. I find it hard to believe that such a slight slope, especially on a rough surface, would have a noticeable effect.

Well, according to flat roof guidelines, a 5% slope should be planned to ensure reliable drainage of flat roofs. This could serve as a reference. However, I wonder why a slope would be planned in the garage at all. What water needs to drain there, and more importantly, where would it go? Floor drains in garage floors are often not permitted.

Second point: Is the bitumen waterproofing membrane on the concrete slab really so expensive that it has to be saved on? Is there no damp proof course in the masonry either? Or was this a concrete garage? From a technical standpoint, there is nothing against using a bitumen waterproofing membrane under the screed.

Knallkörper schrieb:
Which water needs to drain away and, more importantly, where to? Floor drains in garage floors are usually not permitted.

According to the architect, for example, snow and similar water. Especially in winter, with salt, having proper slope is beneficial, he says.

Knallkörper schrieb:
Second point: Is the bitumen waterproofing membrane on the slab really so expensive that it needs to be cut? Is there no horizontal damp-proof course in the masonry? Or was this a concrete garage? From a technical standpoint, there is no reason not to have a bitumen waterproofing membrane beneath the screed.

First of all:
The garage is directly connected to the house and, like the house, built with aerated concrete blocks.
Below the first row of blocks—so on the concrete floor—there is already an Alujet membrane, which extends about 15-20cm (6-8 inches) into the room, allowing connection to the Katja foil.

That’s why I originally asked why this isn’t being done too?!
I probably still have some membrane left over. It probably won’t be enough for everything. But it doesn’t cost a fortune.

Without proper waterproofing on the foundation slab, applying waterproofing beneath the first row of bricks makes less sense. And how often does so much snow come off a car after parking it in the garage that melting water would start to flow? Or does it snow inside the garage? Even then, the question remains where the water should drain. I would seriously reconsider the architect.

In addition, it is generally important to ventilate the garage if it is not going to be heated. This helps the car to dry better and typically reduces the formation of rust.

Joedreck schrieb:
Additionally, it is generally important to ventilate the garage if it is not going to be heated. This helps the car dry better and usually results in less rust formation.

Are there any experiences with specific techniques?
Common fans with humidity sensors?

In new housing developments, you see garages about 90% of the time with doors left open 10-20cm (4-8 inches)...