How do residential rooftop mounting systems typically attach to a rooftop?

Residential rooftop mounting systems typically attach to a rooftop using lag screws into rafters or purlins because this method provides a secure and sturdy installation. Lag screws are specifically designed to penetrate the wood framing of the roof structure, such as the rafters or purlins, allowing for a strong connection that can withstand various loads, including wind and snow.

This approach is preferred because it ensures that the mounting system is anchored to the building's structural elements, reducing the risk of damage or failure. It also helps in maintaining the integrity of the roof by minimizing the potential for leaks, as the screws can be strategically placed to avoid penetrating areas that might compromise the roofing material.

Other methods, such as using screws into shingles or adhesive bonding, may not provide the same level of security or structural connection, potentially leading to issues with longevity and performance. Clamps around the panels are normally used to secure the solar panels to the mounting structure, but they do not serve as the primary means of attaching the mounting system to the roof itself.