While installing a solar system on roof has numerous benefits, there are also some disadvantages to consider:

1. Roof Integrity: The installation process involves attaching mounts and panels to the roof, potentially requiring penetrations or modifications. This can compromise the integrity of the roof and may lead to leaks if not done properly.

2. Roof Condition: If the roof is old or in poor condition, installing a solar system may further deteriorate its condition. It's important to assess the structural integrity of the roof and make any necessary repairs before installation.

3. Limited Roof Space: Depending on the size of the roof and shading factors, there may be limited space available to accommodate a sufficient number of solar panels to meet your energy needs. Insufficient roof space may require the use of additional mounting options like ground-mounted systems.

4. Efficiency Losses: A roof-mounted solar system is subject to temperature fluctuations, which can affect its efficiency. High temperatures can reduce the system's output and lead to a decrease in overall performance.

5. Maintenance Challenges: Cleaning and maintaining roof-mounted solar panels can be more challenging compared to ground-mounted systems. Depending on the roof's slope and accessibility, regular cleaning and upkeep may require additional effort or professional assistance.

6. Roof Replacement: If you need to replace your roof in the future, the solar system will need to be temporarily removed and reinstalled, which can add extra costs and complexity.

It's important to assess these disadvantages in relation to your specific situation and consult with a professional solar installer to determine the best approach for your home or building.