ᐅ Ideal Garage Roof for a Solar Power System

I am currently building a double garage with an attached carport made of YTONG blocks and a ring beam, and I am considering the best roofing option. Sandwich panels were initially planned, but there is still some flexibility.

The roof will be fully covered with solar panels. It is important that no water penetrates the roof, especially around the solar panel mounts, which require quite a few drillings.

The roof is flat with a 7.5-degree (13%) slope facing south. The roof area is approximately 70m² (750 sq ft) – 6m (20 ft) wide and 11.5m (38 ft) long.

The roof is close to the house and should not create a drumming noise when it rains. I don’t think tiles make sense since they won’t be visible due to the solar installation.

I am open to opinions and ideas.

bigborre schrieb:

Of course, I am open to opinions and ideas.

Have a structural engineer plan a sensible design.
Keep in mind that you will be adding a significant amount of weight to the roof. You can roughly estimate at least 50 kg per square meter (10 lbs per square foot)—so in a setup without roof penetrations, that could easily be over 3 tons of weight. If the system is screwed directly onto the roof, it will weigh less—but that requires a detailed plan.

I would simply suggest a standard concrete slab designed according to structural requirements. Then apply waterproofing, followed by the photovoltaic system secured with weights.

bigborre schrieb:

The roof is close to the house

And in which cardinal direction is the house located relative to the garage? You wouldn’t want the house to block the sunlight.

bigborre schrieb:

I am currently building a double garage with an attached carport using YTONG blocks and a ring beam, and I am considering what the best roofing option would be.
Originally, sandwich panels were planned, but I still have some flexibility.
The roof will be fully covered with solar panels. It is important that no water penetrates, especially around the solar panel mounts and the many necessary drillings.
It is a flat roof with a 7.5-degree (13%) slope facing south.
The roof area is about 70m² (750 sq ft) – 6m (20 ft) wide and 11.5m (38 ft) long.

I am also not following in https://www.hausbau-forum.de/threads/garagen-carport-kombi-als-holzkonstruktion-mit-sandwichplatten.46648/ whether and to what extent this entire building would be close to the boundary line (?)

bigborre schrieb:

I don’t think tiles make sense since they wouldn’t be visible because of the solar system.

So why not just use the technical surface itself as the roofing membrane?

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ypg schrieb:

And in which direction is the house located from the garage? Won’t the house block the sunlight?

The house is located to the north, so it should not be a problem.

11ant schrieb:

I also don't follow in https://www.hausbau-forum.de/threads/garagen-carport-kombi-als-holzkonstruktion-mit-sandwichplatten.46648/ whether and to what extent this entire building would be adjoining the property boundary (?)

Why not simply use the technical surface as the roof covering as well?

Sorry, I don't fully understand your answer:
to what extent this entire building would be adjoining the property boundary (?)
-> What do you mean?

Why not simply use the technical surface as the roof covering as well?
-> Sure, if you know exactly how you want to design the roof. It can be wood, steel, concrete, sandwich panels, etc.