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Roofing Requirements

When deciding to purchase a home solar energy system, most homeowners choose to mount the solar array system onto their roof.

Putting a solar array on the roof means roof design and condition become a large factor in both the system design options and in the initial cost.

Understanding roofing requirements and the basics of roofing structures can help you make a more educated decision about your solar array system.


Image of a roof getting solar panels installed using renewable energy

Renewable Energy Tax Credits

Replacing your roof at the same time that you install a new solar array may qualify you for even greater tax incentives. The Renewable Energy Tax Credit works to incentivize homeowners to update their current home energy system with one that is renewable or energy-saving, thus lessening our national reliance on non-renewable energy sources such as oil and coal. If your new roof qualifies as one that meets the federal requirements as energy-saving, you may be able to claim your new roof as part of your renewable energy tax credit.

Learn more about the Renewable Energy Tax Credit.

Structures

The amount of space available for mounting panels and the orientation of roof surfaces is critical to getting the most out of any system. Each solar module is approximately 5.3 feet long and 3.2 feet wide or just about 17 square feet per module. The minimum number of modules for our smallest residential grid-tied system is 4 modules, so you’ll need roughly 80 square feet of roof space in order to install a roof-mounted array system.

Image of a solar array system absorbing sunlight to produce electricity for a home

Simple

The most basic roofing structures are hip and gable types.

Image of a hip roofing structure where a solar energy system could be installed by Yellowlite

Hip

A hip roof is the kind in which all sides of its roofing slope downwards towards the walls of the building. The hip itself is the angle at which the slopes of the roofing meet, and the degree of this angle is called the hip bevel.

Image of a gable roofing structure which is the simplest type of roof to install a solar array system

Gable

Gable roofs are the simplest kind of roofing, yet are available in a range of variations. All gable roofs constitute two flat slopes that are joined together to form a ridge, thus creating a peak or triangle on the wall of the front. The word gable refers to this triangular shape. 

Complex

Some roofs by design have a greater number of surfaces, such as mansard and gambrel. Simple designs can also be made more complex.

Image of a gambrel roofing system

Gambrel

The gambrel roof can best be described as a mix between a gable and a hip roof. It is two-sided with a double slope on each side. The lower slopes are positioned at a steep angle, while the upper slopes are relatively flat. This style of roof quite often has many surfaces.

Image of a mansard roofing system

Mansard

The mansard roof is characterized by four sides, each double-sloped, the lower slope being significantly steeper than the one above it. The upper slope is not usually visible from the ground, as it is angled only enough to allow the run-off of water.

Image of a complex hip and gable roofing system

Complex Hip and Gable

As housing shapes deviate from rectangular to L-shaped and beyond, the associated hip and gable structures become more complex, with more than four basic surfaces and more than four simple orientations. Some can have dozens of different surfaces. Cross gable designs are the most common complex types, in which perpendicular housing sections carry gable roofs perpendicular to the original roof

Other Factors

Orientation and pitch of the surfaces on which to mount the solar panels will have the largest impact on performance and therefore the value of the investment. To some degree this can impact cost and design as well.

Orientation

In Ohio, the sun is always to our south, so roofs ideally should face true south. However, surfaces facing east, southeast, southwest or west can also work. Roof pitch becomes more critical as the orientation deviates from true south. Contact us to learn more about how YellowLite can maximize your design for certain combinations of orientation and structural design.

Pitch

The roof pitch is a numerical measure of the steepness of a roof. It is expressed as a ratio of vertical rise to horizontal run, or in inches of rise per foot of run. Ideal pitch is approx equal to site latitude.

Other Penetrations

Many homes include chimneys and associated crickets, vents and vent pipes, skylights, dormers, and other shapes that create two obstacles for installing solar panels. First and most obvious, they must be avoided, which requires bypassing some amount of valuable roof space. They can also add shading concerns to adjacent panels.

 

Curves and Flairs

For the most part, curved surfaces that are not flat should be avoided.

FAQs

A

Because of the wiring design of a solar module, all of the individual solar cells on a module must receive full sunlight for the module to work properly. If any portion of the module is shaded, the entire module's power output-even those sections still exposed to sunlight-is lowered.

A

This is the ideal situation for installing solar. Before laying the roof, you can install flash-able mounting brackets that provide the highest level of protection from leakage. Although it is easier to incorporate solar during a reroof or new construction, most installations aren’t done under these circumstances. Reroofing a home after a system is in place is not a difficult hurdle. When it is time to reroof a home we are glad to assist with removing the panels so construction proceeds smoothly.

A

All installations are weather-sealed so that there is no threat of leaky roofs. If a leak does occur, and the leak is determined to be directly contributed to the solar installation, all repairs will fall under the YellowLite labor warranty and will promptly be corrected.

News & Updates

Owning A Solar Energy System Has Overtaken Leasing

As time goes on and solar prices continue to drop, the leasing option will become less popular. Here at YellowLite we can help a client structure a loan that resembles a lease in all but name, but the client will still be able to collect the financial benefits of owning the system.

Electric Vehicles To Add Solar Panels To The Roof?

Over the course of a year, this one panel mounted on top of the roof of the vehicle, if all conditions are perfect, would power a vehicle for around 660 additional miles over the course of a year. Based on 25 mpg, this would be around 27 gallons of gasoline per year that would not have to be consumed.

Read All News >