Safal Steel’s Zincal® coated steel roofs and solar PV panels are the perfect partnership of function, service life, and return on investment. The technique of coating steel with Aluminium and Zinc (55% Aluminium, 43.5% Zinc and 1.5% Silicon) has been extensively researched and surpasses the performance of traditional galvanised steel. The Aluminium coating component provides a tough physical barrier while the Zinc in the coating provides sacrificial protection and also protects the steel at the cut edges. This superior corrosive property increases the life of the steel core up to four times longer than that of galvanised steel. In Zincal®, the durability and service life of modern coated steel is extended even further.
Zincal® roofs are cool roofs, with a thermal mass significantly lower than traditional galvanised steel and clay tile roofs due to the addition of Aluminium. This increases the reflection of the sun’s rays, creating a cooler building in summer and a warmer building in winter. At a solar radiation level of 850W/m² equivalent to 30°C ambient temperature, a Zincal® roof transmits 65 watts/m² of heat compared with 120 watts/m² for a galvanised roof and 150 watts/m² for a clay tile roof.
In terms of lifespan, research shows that Aluminium-Zinc coated roof systems can last 60 years and more while the industry standard for solar PV panels is about 25 to 30 years. This means you shouldn’t experience the hassle of having to remove and reinstall a PV system when you replace your roof.
Because PV installations typically don’t take up the entire surface of the roof, and sometimes require highly reflective roofing to ensure sufficient system efficiency, cool roofs and PV panels are complementary technologies.