When considering a solar installation, one of the first questions homeowners ask is: “How much will it cost?” If you have a slate roof, the answer may differ from what you’d expect with a more common asphalt shingle roof. While both roofing types can accommodate solar panels, the installation process—and associated costs—vary significantly.
Slate Roofs: Specialized Installation, Higher Precision
Slate roofs are durable and elegant but also fragile. Traditional solar panel installation methods involve drilling and fastening equipment directly onto the roofing material. On an asphalt roof, this is standard practice. On a slate roof, however, this approach risks cracking or damaging the tiles, leading to potential leaks and costly repairs.
To avoid these issues, solar on slate roofs requires a non-invasive mounting system, such as the SlatePlate, which transfers the panel’s weight to the roof’s structural supports without touching the slate tiles themselves. Installers with slate experience are essential, and this specialized process typically results in higher upfront labor costs.
Asphalt Roofs: Lower Cost, Faster Install
Asphalt roofs are the most common and easiest to work with when installing solar panels. Installations are typically quicker and less expensive because the process is well-understood and requires less precision. Labor costs are lower, and most solar companies are experienced with this type of roof.
Comparing the Costs
- Labor: Expect to pay more for skilled labor when installing on a slate roof. Specialized installers are essential to avoid roof damage.
- Equipment: The SlatePlate or similar non-invasive systems add material costs compared to traditional racking for asphalt roofs.
- Time: Installation on slate takes longer due to the care and planning involved.
Long-Term Value
Despite the higher upfront cost, solar on slate roofs offers excellent value. Slate roofs often last over 100 years, while asphalt roofs may need replacing in 20-30 years—potentially requiring solar panel removal and reinstallation. A properly installed solar system on a slate roof may never need to be disturbed.
Final Thoughts
While it’s true that installing solar on a slate roof costs more initially, the longevity and beauty of slate, combined with the efficiency of modern mounting systems, make it a smart long-term investment. Always work with experienced solar on slate professionals to ensure the job is done right.
