Green flat roof and photovoltaic system

Prop up, install photovoltaic modules and a bit of substrate around them, done... I wouldn't even ask there and would just build it without the greening. Who would come by to look at your flat roof with a ladder?

Thank you very much for the numerous responses! That has already helped me a lot.
I understand that the most reliable answer can only come from the building authority. But I actually find it quite helpful to hear here if anyone has already had experience with this.

what is the problem now?
Do an extensive greening with sedum plants on it, that also works under the raised modules, there are varieties that tolerate that.
Then you have both.

The problem is that the architect thinks that photovoltaics and green roofing exclude each other. Before I, after my amateurish Google search that claims the opposite, run directly to the building authority, I just wanted to hear once again if someone here has already been confronted with the issue.

Raise it, install photovoltaic modules and a bit of substrate around it, done...
I wouldn’t even ask and would just build it without the greening. Who would come by to check your flat roof with a ladder?

Actually, aerial photographs are evaluated here in the district. On the basis of that, a neighbor was also inspected on site.

I don’t actually want to circumvent the regulation with the greening. I think the green roof is a great thing and would like to combine both. Based on the feedback here, I will push it again. Thank you all!

The problem is that the architect thinks photovoltaic and green roofing exclude each other.

Well, even with extensive green roofs, one should certainly check more frequently whether the vegetation is getting out of hand.

Actually, aerial images are being analyzed here in the district.

And then you see a photovoltaic system at your place and green roofing around it. Who looks under the photovoltaic panels?

Well, even with extensive green roofs, one should certainly check more often whether the vegetation is getting out of hand.

We definitely have that on our radar as well. But overall, I see it as less problematic.

And then you see a photovoltaic system with the green roof around it. Who looks under the photovoltaic panels?

Like with the neighbor: representatives from the municipality or building authority.

But in the end, it doesn’t really matter. I want to have both, after all. It’s not like I’m trying to avoid taking care of the green roof. So I have no problem greening underneath the photovoltaic panels either. Whether anything will grow there in the shade remains to be seen... :D

Then please inquire at the building authority. Then you’ll have a legal statement.

Cooling effect through greening for the cells above lol
It will also be raised...
Of course, you can green it and then put the photovoltaic system on top. You just have to remove the substrate for the stands. But it makes more sense to leave it out.

I would just submit it with the building application.

Why should one remove the substrate for the stands? And then set up the photovoltaic mounting directly on the drainage mat?

We have greened and have a 9.9 kWp system on the roof. And I would always do it that way. Every flat roof builder recommends greening because it provides additional protection for the roofing membranes.

: We greened our flat roofs ourselves, 3 in total, main roof, "side roof," and garage, it’s not rocket science.

Here is the structure we have on the main roof 110 sqm: root-resistant fleece 300 grams, 20 mm drainage mat with laminated fleece, and then 8 cm roof soil plus 30 cm gravel edge.

On the "side roof" and the garage, together 90 sqm: root-resistant fleece 300 grams, 9 mm drainage mat with laminated fleece, and then 8 cm roof soil plus 30 cm gravel edge.

On the side roof there is a 30 sqm roof terrace and the rest, as well as the garage, were completely greened with sedum plants. On the main roof only the area outside the photovoltaic system.

Costs for the materials, almost 4,000 EURONEN.

Where did you buy that? I also want to add greenery here, but I'm having trouble finding something for under €40/sqm.