Solar heat systems mounted on rooftops can be either on-roof or in-roof installations.
On pitched roofs, on-roof installations are mounted directly onto the roof using a bracket substructure and on flat roofs using a ballasted rail system.
In-roof solar panels are integrated, thus replacing the roof or the facade itself.
Facade-integrated solar panels do not necessarily have to be rear-ventilated, but can be mounted directly to the outside wall, depending on the conditions.
Facade-integrated solar collectors can be designed as part of the architectural layout of a building.