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Photovoltaic panels on the roof
PV panels need to be placed on a well enlightened part of the roof (preferably orientated to the south, south-west), so that electricity can be produced efficiently. The most efficient slope for PV panels is approximately 35°. The assembly of PV panels is carried out by specialized companies that design and calculate the correct amount of PV panels. All you need to do is enter a photovoltaic power plant on the roof.
It is advisable to install snow breakers and / or catchers under the PV panels as shown on the picture above. Snow fallen on the shingles will hold and melt gradually. But snow fallen on the solar panels can start to glide down due to the smooth surface. Gliding snow can create a small but sudden avalanche, which can surprise, hurt or injure someone. Installing snow stoppers will protect the space under the PV panels.
How to fix solar panels to the roof?
PV panels are mounted on aluminum profiles. The length of the aluminum profiles to be installed on the roof is determined by the number of PV panels.
Aluminum profiles are fastened to the roof with long screws. The screws pass through the shingles and the wooden deck and are firmly attached to the rafters or slats. The screw must have a high-quality rubber (EPDM) gasket washer on the exterior to ensure perfect water resistance and prevent any leaking into the drilled hole through which the screw passes through the roof covering. We can find many versions of these brackets on the market, but the most secure system is to use the screw with a metal plate or flashing combined with an EPDM gasket. The top part of this metal flashing is always slided under the shingle above.
The screw must be strong and long enough so they are firmly screwed in the wooden roof structure. This way they don’t get damaged or bent by large amounts of snow, and strong winds blowing under the PV panels won’t be able to blow them away.
