solar panels being mounted on a roof

Solar racking: what you need to know

Once a solar panel system is installed, you’ll generally only see the shiny new panels on your property. However, the solar racking beneath them is an integral part of any solar installation.

What is solar racking?

In order to safely fix solar panels to buildings or the ground, solar installation companies use solar racking products (also known as solar mounting) that hold solar equipment in place in an installation. Solar racking is usually made from aluminum, which works well for rooftop installations due to its combination of strength and low weight, as compared to other metals.

How much does solar racking cost?

Although solar racking is a vital part of any solar installation, the cost of racking represents only a small portion of a total installation. According to the National Renewable Energy Laboratory (NREL), solar racking should cost approximately $0.10 per Watt (W). Given that the average cost of a solar panel installation on EnergySage is $2.98/W, racking should make up roughly 3 percent of the total system cost.

Solar racking components

Not all racking systems are the same. However, there are several components common to most solar racking solutions:

1. Flashings

Installing solar panels on a roof involves drilling holes that are susceptible to leaking if not properly covered. In order to prevent water damage to your property, solar installers use flashing as part of their solar mounting solution. Flashing is material used to stop water from leaking through your roof, usually in the form of an aluminum rectangle. On a traditional asphalt tile roof, flashing is inserted underneath shingles. For roofs made with tile, metal, rubber, or wood, there are specially designed flashings that fit the unique shape of your roofing material.

solar panel flashing on a roof

2. Mounts

Solar panel systems are actually attached to your roof with mounts. Mounts are sometimes referred to as “feet” and are usually attached to your roof with a bolt through the flashing and into a rafter, securing your whole system. There are many varieties of mounts used in different racking systems. Incidentally, this is why solar installers need access to your attic or the underside of your roof during an initial site-visit: to make sure that your rafters are structurally intact and appropriately spaced to accommodate the mounts for your solar panel system.

solar panel mount foot

3. Rails

Mounts hold up rails, which are the component of solar racking that your solar panels sit directly on top of. They are often long aluminum tracks that are installed either vertically or horizontally on your roof plane. There are several types of alternative rail setups to standard rails, such as rail-less or shared-rail. An added benefit of rails is that they provide a clear space to run the wiring of your solar panel system behind the panels themselves, helping to reduce clutter and improve the safety and aesthetics of your installation.

solar panel racking rails on a roof

4. Clamps

In order to keep solar panels secured in place on racking, installers use clamps, which link solar modules to the rails below. Installers will often use both mid-clamps and end-clamps on an installation. Mid-clamps sit between solar modules and can hold panels in place on two sides, while end-clamps sit at the ends of solar arrays and are typically larger.

solar panel racking clamp

Curious how a full solar panel installation works? Check out our complete overview and time-lapsed video.

Top solar racking brands to know

There are a few major racking brands you should be aware of in the solar industry:

  • SnapNrack
  • Unirac
  • Ironridge

Let’s dive into each of these brands a little deeper to understand what sets them apart from one another:


SnapNRack is a solar racking company based in California that specializes in making a snap-in racking solution. Their Ultra Rail Roof mounting system uses snap-in brackets for attaching rails, making any installation easy. They also produce ground-mounted racking systems, as well as more traditional penetrating rooftop solutions without snap-in rails.


Unirac has several product lines, all catering to different installer preferences for residential and commercial solar panel systems. They have over 5 gigawatts (GW) of installation experience spread out across 750,000 installations and have been active for over 20 years. They are headquartered in New Mexico.


Generally thought of as making some of the physically toughest racking equipment, Ironridge is another popular solar racking manufacturer. They offer pitched roof, flat roof, and ground-mounted racking solutions. Ironridge is based in California, and has been operational since the mid-1990s.

Finding the right racking for your solar panel installation

Whether you already know exactly what racking product you want for your system or you’re still exploring your options, you should review multiple offers from different solar installers before you make your final decision. The easiest way to connect with solar companies that can design systems to your specifications: join the EnergySage Solar Marketplace, where qualified pre-vetted installers are preparing quotes for property owners across the country. You can easily specify the particular equipment you’re seeking during the registration process.

Posted on by .
Categories: Solar 101
Tags: , , ,

About Jacob Marsh

Jacob is a researcher and content writer at EnergySage, where he's an expert on current issues–and new technology!–in the solar industry. With a background in environmental and geological science, Jacob brings an analytical perspective and passion for conservation to help solar shoppers make the right energy choices for their wallet and the environment. Outside of EnergySage, you can find him playing Ultimate Frisbee or learning a new, obscure board game.

6 thoughts on “Solar racking: what you need to know

  1. Hunter

    Please advise. Building is a circa 1911 structure with a queens truss beams meaning trusses are 10 feet or more apart. Lathing goes across beams to which plywood decking is adhered. What would be best method to secure panels to this roofing system. I thought securing to decking would be preferred method. Comments indicate they are subject to pulling out in high wind. Your input will be greatly appreciated

  2. Bill Hartman

    Two reasons for not mounting solar panels directly on a roof:
    1. A space of 2 to 4 inches between the panels and the roof is recommended. Solar panels inherently get warm. Absent that gap between the panels and the roof, they will get hotter and not last as long.
    2. Any bolt that connects the panels to the roof must go through the roof and into the roof rafters below. Otherwise (connecting only to the roof sheathing), high wind can destroy panels and tear holes in your roof. It is easier to connect the rails to the rafters with correct rafter spacing for the bolts and then add the panels to the rails without regard to the location of the rafters. Otherwise, panels must be placed with consideration for the rafter locations, which complicates installation.

    1. Terry

      So the millions of panels installed on residential, commercial, and industrial roofs for the last 30+ years (including hot areas like AU, or southern US like FL where I live) are all going to go bad because of heat. hmmm so with the engineering and 25 year warranties that l support roof mounting there must be a global conspiracy. hmm As for wind, the mounts need to go in to the trusses / rafters and you would add some extras on the rail ends right in the sheeting to exceed code. Any wind capable of ripping the panels off the roof would have already ripped the roof off the house regardless.

      Relax buddy…there is no conspiracy and these things have been engineered and proven for decades with millions installed.

  3. Derek Doyne Ditmas

    i am fixing my six panels direct to a store roof… is there some technical reason people use racking? Derek. kenya

  4. KVarn

    Are there restrictions regarding having ground-mounted systems within a city? I have an area I’d like to consider using. It would be enough to start and possible still preserve some yard use. Where do you suggest starting to see if this option is workable?


Leave a Reply

Your email address will not be published.