Can I Install Solar on a Flat Roof?
Key Takeaways/TLDR
Yes, solar panels can be installed on flat roofs using special mounting systems
Flat roofs offer flexibility in panel placement and tilt angle
Ballasted racking systems often avoid roof penetrations
A proper design ensures optimal performance and water drainage
LUMI Renewables specializes in custom solar solutions for all roof types
Introduction
Flat roofs are common on many modern homes, garages, commercial buildings, and urban properties across Alberta. If you have one, you might be wondering if you can still install solar panels.
The answer is yes. In fact, flat roofs can be an excellent surface for solar with the right design and equipment. This blog explains how flat roof solar works, what to consider, and why it may even be better than traditional sloped installations.
How Solar Panels Work on Flat Roofs
Solar panels perform best when tilted toward the sun, usually at a 15 to 40 degree angle. Since flat roofs do not have a natural tilt, installers use mounting systems that elevate and angle the panels correctly.
There are two main mounting options:
1. Ballasted Racking Systems
Panels are mounted on racks held in place by concrete blocks
No need for roof penetrations
Ideal for buildings with strong structural support
Easy to maintain and adjust in the future
2. Penetrating Racking Systems
Panels are attached directly to the roof with secure, sealed mounts
Often used in windy areas or on taller buildings
Requires roof penetration but can offer more stability
LUMI Renewables evaluates your roof type, structure, and local conditions to recommend the best solution.
Benefits of Flat Roof Solar
Flexible panel placement. Panels can be positioned for maximum exposure to sunlight
Optimal tilt design. Panels are angled for better energy production
Easier access. Maintenance is safer and simpler on flat roofs
Low visual impact. Panels can be positioned to stay out of sight from the street
Things to Consider
1. Drainage and Snow
Flat roofs need clear drainage. Solar panels must not block water flow or trap snow. Installers design the layout to keep roof drains accessible and reduce buildup between panel rows.
2. Structural Load
Ballasted systems add weight to the roof. Structural assessments ensure your building can support the system safely.
3. Roof Obstructions and Shading
HVAC units, vents, and nearby buildings can cause shading. A proper design uses sun modellingz to place panels where they will be most effective.
How LUMI Makes Flat Roof Solar Simple
We have installed solar on many flat roofs across Alberta. Whether it's a downtown home or a rural shop, our team knows how to get it done right.
We provide:
Free roof assessments and solar design
Custom mounting systems for your roof type
Full permitting and paperwork support
Professional, trained installers
Assistance with available solar incentives and loans
Final Thoughts
A flat roof should not hold you back from going solar. With the right equipment and planning, flat roof systems can deliver strong performance and long-term savings. In some cases, they are even easier to maintain and customize.
Book a free consultation with LUMI Renewables today to find out how we can help you turn your flat roof into a clean energy solution.
