Flat roof - There is water on it

Hm... how is the warranty on the roof if I green it independently? If water comes through after 3 years due to a construction defect, they will just laugh at me

That may well be the case. We moved in in September 2018, but I only greened it in June 2022, after it became clear that the flat roof of the extension (on the right in the picture) was hardly suitable for the photovoltaic system that had meanwhile also been commissioned and installed.

The big catch with roof loads, of any kind (gravel, green roofing, photovoltaics, ...) is that the roofer will always swear, for example when a leak detection is due. In case of doubt, you scrape off the greenery before he starts.

The big downside of roof loads, whatever kind (gravel, green roofing, photovoltaics, ...) is that the roofer will always curse when, for example, a leak detection is due. In case of doubt, you scratch off the greenery before he starts.

I cannot confirm that. We had a building I deal with professionally that developed a leak in the flat roof after years. The roofer came with special probes and was able to locate the leak. Only the damaged part had to be cleared for sealing. Just try googling flat roof leak detection.

In fact, 40mm is sufficient, I always thought that emergency outlets had to be higher. Mi

I cannot confirm that. We had a building I deal with professionally where, after years, a leak was found in the flat roof. The roofer came with special probes and was able to locate the leak. Only the damaged part had to be cleared for sealing. Just google flat roof leak detection.

I have seen something like that at the neighbor’s; the garage was filled with a gas. And the roof was searched with a sniffing sensor. And then, gravel was removed in an area of 2m2. Costs about 700 euros for 1 day of searching with travel and so on.

I cannot confirm that. We had a building I am professionally involved with that had a leak in the flat roof after years. The roofer came with special probes and was able to locate the leak. To seal it, only the damaged part had to be cleared. Just try googling flat roof leak detection.

With the appropriate coin insertion, many things are possible :) And you need someone who has the equipment and is also available.

And you need someone who has the equipment and is also available.

This wisdom of course applies to almost all areas of life ... ;)