Installing solar panels on your roof can be a great way to reduce your energy bills and carbon footprint. However, not all roof types are well-suited to solar panels. When considering solar PV, you’ll need to think about your roof type, pitch, orientation and whether it gets any shading. Here is an overview of which roof types work best with solar panels.
Pitched Roofs
Pitched roofs are the most common roof type on houses in the UK. South-facing pitched roofs are usually best for maximising solar panel output. A pitch of 30-40 degrees allows the panels to be tilted to an optimal angle and minimise shading from the rows in front. East/west facing pitched roofs can also work well, although the energy yield will be lower than a south-facing roof. North-facing pitched roofs generally don’t get enough direct sunlight to be suitable for solar panels.
Tile and Slate Roofs
Tiled or slated pitched roofs are suitable for solar, provided the roof is strong enough to hold the weight of the panels. The panels can be installed using specialist brackets above the roof covering. This avoids any need to remove or replace the existing tiles or slates. Concrete or clay tiles tend to be heavier than synthetic slate, so may require additional structural checks.
Flat Roofs
Many commercial and some domestic properties have flat or almost flat roofs. These can be an excellent choice for solar panels as they allow frames to be mounted at the optimum tilt and orientation. The panels can be fitted on rails for optimum coverage, efficiency and easier cleaning and maintenance access. Flat roof solar systems are quick to install and tend to be cheaper than pitched roof systems.
Metal and Membrane Roofs
Modern industrial-style roofs made of metal sheeting or rubber membrane can also readily accommodate solar panel installations. The thin profile of the roofing sheets causes minimal shading issues. Solar mounting systems can be bolted directly through the roofing material into the underlying wooden rafters or steel supports. This creates a secure base without compromising the waterproof roof covering.
Thatched Roofs
Traditional thatched roofs are problematic for solar panel installation. Aside from the fact that 75% of properties with a thatched roof are listed buildings, drilling holes for supports can damage the waterproofing and cause leaks. The varying angles across the roof also make it hard to position panels efficiently. Thatched roofs are also at higher risk of fire, so electrical items increase this danger. It is generally not recommended to install solar panels directly onto the surface of thatched roofs.
Key Considerations
When evaluating your roof for solar panels, look at the type of covering, age, durability, angle and orientation. Shop around and compare solar panels to see what different pricepoints and offerings there are. Consider any planned replacement or maintenance. Look for shading from trees, chimneys and other buildings. A structural engineer can advise if strengthening is required. Choose a reputable installer and ensure you have the appropriate consents.
Positioning your solar PV system thoughtfully will maximise the benefits for your home and the planet.
