The design of rooftop photovoltaic supports must be tailored to different roof structures. For sloping roofs, supports parallel to the roof slope can be designed, with a height of approximately 10~15cm from the roof surface to facilitate ventilation and heat dissipation for the photovoltaic modules.

The roof angle supports can also be designed with a low front and high rear slope to maximize the solar reception of photovoltaic modules. Flat roofs typically require a triangular support structure with the inclination angle of the support surface matching the reception tilt angle of the photovoltaic modules.

Roof-mounted photovoltaic supports must be connected to the main structure of the building, not the roofing material. If using a concrete cement foundation to secure the supports on the roof, it is necessary to partially uncover the roof's waterproofing layer, scrape off the concrete surface, locate the reinforcing steel in the roof concrete, and then weld it to the pre-buried bolts in the foundation.

When welding steel bars is not possible, pre-bury steel bars by drilling holes in the roof, or roughen the surface of the roof used for the foundation work to increase the adhesion between the roof surface and the concrete foundation. Then, conduct a secondary waterproofing treatment on the damaged sections of the roof's waterproofing layer.

For roofs that cannot have concrete foundations, the photovoltaic modules are typically fixed using angle steel supports. The supports' fixation requires methods such as the wire rope (or wire) tensioning technique, or the extended support fixation method. The lower edge of the triangular support photovoltaic modules should be more than 15 cm away from the roof surface to prevent mud and water from splashing onto the glass surface of the modules during rain, which can dirty the glass.