Solar panels for flat roofs: Higher costs, but better savings

To maximize your solar panels‘ time in the sun, they should ideally face south and be tilted between 15 and 40 degrees. This orientation and tilt angle ensure that the panels receive the maximum amount of direct sunlight throughout the day, optimizing their energy production. Most sloped roofs naturally fall within this angle range, which makes installing solar panels relatively straightforward and cost-effective. The natural pitch of the roof helps to shed water and snow, reducing the risk of damage and maintenance issues.

However, if you have a flat roof, you’ll need additional racking equipment to get your panels at the best angle and direction. Flat roofs, while offering a large, unobstructed surface area, do not provide the natural tilt that sloped roofs do. To achieve the optimal angle, you’ll need to install adjustable racking systems that can elevate the panels to the desired degree. These racking systems can be more expensive and labor-intensive to install, which is why flat roof installations generally cost more than sloped roof installations.

Despite the higher initial costs, flat roof solar installations are still worth considering for several reasons. One of the primary advantages is the flexibility flat roofs offer in terms of solar panel orientation and angle. You can position the panels to face true south and adjust the tilt angle to match the latitude of your location, ensuring maximum sun exposure. This flexibility can lead to higher energy production and greater efficiency, even if the initial installation costs are higher.

Flat roofs also provide more space for solar panels, allowing you to install a larger system. This can be particularly beneficial if you have high energy consumption or if you want to generate surplus electricity to sell back to the grid through net metering programs. The additional panels can significantly increase your energy production and reduce your reliance on grid electricity, leading to substantial savings on your electric bills over time.

Moreover, flat roof installations can be easier to maintain and access. Panels on a flat roof are typically closer to the ground, making it simpler to perform routine cleaning and inspections. This can help prolong the lifespan of the panels and ensure they continue to operate at peak efficiency.

Additionally, there are several ways to recover the additional costs associated with flat roof installations. Many states and local governments offer incentives, rebates, and tax credits for solar installations, which can significantly reduce the upfront costs. These financial incentives can make the initial investment more manageable and help you see a return on your investment sooner. Furthermore, the increased energy production from optimally positioned panels can lead to higher savings on your electric bills, helping to offset the initial expenses over time.

Why do flat roof installations cost more?

As we’ve mentioned, solar panels on flat roofs generally require specialized racking equipment to get them at the right orientation and angle. Unlike sloped roofs where panels can be installed directly onto the surface, flat roofs necessitate the use of angled mounts. These mounts are designed to elevate and tilt your solar panels so that they can face south (in the Northern Hemisphere) and achieve an optimal tilt angle between 15 and 40 degrees. This positioning exposes the panels to the sun for as much of the day as possible, maximizing their energy production.

The angled mounts used for flat roofs are engineered to be stable and secure, capable of supporting the weight of the solar panels while withstanding wind and weather conditions. They can be adjusted to different angles depending on the season, further enhancing the efficiency of the solar array. However, the use of these specialized racking systems comes with additional costs. The extra materials and the labor involved in designing and installing the mounts contribute to a higher price tag for flat-roof solar panel systems.

While the initial investment for a flat-roof solar installation may be higher due to the specialized equipment, the long-term benefits of optimized energy production can outweigh the costs. The enhanced performance of the solar panels can lead to greater savings on electricity bills and faster payback periods, making the investment worthwhile for property owners with flat roofs.

Why flat roof installations are usually easier and safer

Despite higher costs overall, labor is often cheaper in flat-roof installations. While the specialized racking equipment can drive up the total cost of a flat-roof solar system, the labor and installation typically make up about 10% of the overall expenses. Installing solar panels on a flat roof is generally much easier and safer for your solar company compared to working on sloped roofs. Workers can move freely on the roof without requiring special safety equipment, and most of the roofing materials used on flat roofs can easily handle the wear and tear associated with the installation process.

One significant advantage of flat-roof installations is that your solar installer won’t need to make roof penetrations to secure the solar panels. Traditional sloped roof solar installations typically use “penetration mounts,” where installers affix the racking equipment to the roof by drilling multiple holes. This process can sometimes lead to leaks or other structural concerns. In contrast, flat roof systems often employ a weighted mounting system known as a “ballast system.” This system uses gravity and weights to keep the equipment firmly in place, eliminating the need for any roof penetrations.

Using a ballast system not only simplifies the installation process but also reduces the risk of damaging the roof structure. The stability provided by the ballast system ensures that the solar panels remain securely mounted without compromising the integrity of the roof.

It’s important to note that despite the relative ease of installation on flat roofs, we still recommend having professionals install your solar system rather than attempting a DIY project. Professional installers have the expertise to properly design and mount the system, ensuring optimal performance and compliance with local codes and regulations. Additionally, professional installation can help guarantee warranty coverage and maximize the efficiency and longevity of your solar investment.

Get your home flat roof solar panel from us

Once you find a solar company to perform the work, your flat roof installation should be relatively straightforward. It will probably cost more compared to sloped roof installations, but it will also be safer for your installer and could help you save more money over time.

With our range of solar panel kits and packages you’ll get free installation as well as the option to spread the cost with our finance options.