When it comes to installing solar panels on flat or low-slope roofs, one of the most popular solutions is the ballasted roof system. This non-penetrating solar mounting method offers a smart alternative for preserving roof integrity while ensuring secure panel installation. Let’s take a closer look at what a ballasted roof system is, how it works, and when it’s the best choice.
Understanding the Ballasted Roof System
A ballasted roof system is a type of solar mounting structure that uses weight—typically concrete blocks or pavers—to hold the solar panel racking in place. Instead of anchoring directly into the roof with screws or bolts, these systems rely on gravity and distributed load to secure the solar array.
This makes ballasted systems especially popular for commercial buildings or large flat-roof installations where drilling into the roof membrane could risk leaks or void warranties.
Key Components of a Ballasted System
- Mounting Racks: Designed to cradle solar panels at a specific tilt angle, often made from corrosion-resistant aluminum or steel.
- Ballast Weights: Typically concrete blocks placed strategically on the racking system to counteract wind uplift and other external forces.
- Protective Pads: Placed beneath the racks to protect the roofing surface from abrasion or pressure points.
Advantages of a Ballasted Roof System
- No Roof Penetrations
Since there’s no drilling involved, the roof’s waterproofing remains intact—reducing the risk of leaks and structural damage. - Faster Installation
Without the need for anchors, installation time is significantly reduced, which also lowers labor costs. - Ideal for Leased Buildings
Ballasted systems can often be removed or relocated without damaging the roof, making them perfect for buildings under lease agreements. - Compatibility with a Variety of Flat Roofs
These systems work well with most commercial flat roofs, especially those made of concrete or membrane materials.
Considerations Before Installation
While ballasted systems offer many benefits, they do require careful planning:
- Roof Load Capacity: The structure must support the additional weight of the ballast.
- Wind and Seismic Factors: In areas with high wind or seismic activity, extra ballast or alternative anchoring may be required.
- Tilt and Orientation: Tilt angles are often limited to reduce wind resistance, but proper design ensures panels still receive optimal sunlight.
SIC Solar Expertise in Ballasted Mounting Solutions
SIC Solar, a company specializing in the design and production of photovoltaic mounting systems, offers a range of ballasted racking options tailored for flat roof applications. Their systems are engineered for fast assembly, structural reliability, and long-term durability—making them a trusted partner for solar projects around the world.
Whether for a commercial rooftop or an industrial facility, SIC Solar mounting systems are designed to streamline installation without compromising performance or safety.