Waterproofing is crucial for the construction of distributed rooftop photovoltaic (PV) systems, primarily for the following three reasons:
① Short Lifespan of Existing Waterproofing vs. PV System Lifecycle Mismatch. PV power stations typically have an operational lifespan of 25 years. However, the current warranty period for waterproofing in China is only 5 years. In practice, leaks occurring within just a few years are commonplace. For existing roofs, leaks and potential leakage have become significant issues.
② Building Leaks Severely Impact PV Power Station Operations.Water leakage will force the PV station to suspend operations or even be fully dismantled for waterproofing repairs, leading to substantial economic losses. While omitting waterproofing measures might accelerate short-term returns, the long operational life of the station means any interruption for repairs due to leaks will negatively impact long-term investment returns.
③ Rooftop PV Installation Can Affect the Original Waterproofing Layer. Current PV bracket installation techniques are predominantly penetration-based, which can damage the original waterproofing layer. Improper handling of penetration points can lead to leaks. For metal roofs, the installation process may loosen seams, also causing leakage. For factory buildings, which are currently the primary application for rooftop PV, severe leaks can force business operations to halt, resulting in economic losses. Therefore, factory owners typically place greater emphasis on waterproofing.
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