BrightGridFlat roofs can be excellent locations for solar because they may provide large, unobstructed areas. However, the mounting system and structural design need careful consideration.
How are solar panels mounted on flat roofs?
Flat-roof solar systems commonly use purpose-designed mounting frames. Depending on the roof and building, systems may be ballasted or mechanically fixed.
What is a ballasted system?
A ballasted system uses weight to resist wind forces rather than relying solely on penetrations into the roof. Structural loading and roof construction must be assessed.
Why does maintenance access matter?
Panel layouts should allow appropriate access to roof equipment and maintainability while making efficient use of the available area.
- Roof loading
- Wind exposure
- Roof membrane
- Drainage
- Panel orientation
- Maintenance access
- Shading from rooftop equipment
Do not maximise panels at the expense of the roof
A good flat-roof design balances generation, structural loading, access, drainage and long-term roof integrity.
Explore flat-roof solar
Assess whether your flat roof can support a properly designed solar system.
Explore SolarFrequently asked questions
Can solar panels be installed on a flat roof?
Yes. Flat roofs can be suitable for solar using appropriate mounting systems and structural assessment.
Do flat roof solar panels need ballast?
Some systems use ballast, while others use mechanical fixing. The correct solution depends on the roof and structural design.
Can solar panels damage a flat roof?
Correct design and installation should protect the roof system, including drainage and waterproofing requirements.
Marcus Webb
Head of Engineering at BrightGrid Energy
