Technical Article
Preparing an Industrial Metal Roof for a PV Solar Panel Installation
Technical Article
Preparing an Industrial Metal Roof for a PV Solar Panel Installation
Installing a photovoltaic (PV) solar system is a significant long-term investment, but before panels are fitted, it is essential to ensure the roof beneath them is in good condition.
Once a PV array has been installed, access to the roof itself is greatly restricted. Any future repairs to the roof covering may require the removal and reinstallation of the solar panels, resulting in additional costs, operational disruption, and downtime.
For this reason, the roof should either be replaced or fully refurbished before the PV installation takes place.
Key Areas to Address Before Installation:
Replace Aged Rooflights
Older rooflights can become brittle, discoloured, or prone to cracking and leakage. Replacing deteriorated rooflights before the PV system is installed helps prevent future maintenance issues and ensures the roof remains watertight for the lifespan of the solar installation.
Seal or Replace Defective Fixings
Roof sheet fixings are a common source of water ingress on industrial roofs. Perished washers, loose fasteners, and corroded fixings should be replaced or sealed as part of the refurbishment process to eliminate potential leak points.
Replace Foam Fillers and Refurbish Ridge Cappings
Foam fillers located at eaves and ridge details play an important role in preventing wind-driven rain, debris, and pests from entering the roof structure. Over time, these fillers can deteriorate, shrink, or become dislodged, creating potential routes for water ingress. Ridge cappings should also be inspected for corrosion, movement, or failed seals. Replacing defective foam fillers and ensuring ridge cappings are properly sealed and secured will help maintain the weatherproof integrity of the roof before solar panels are installed.
Replace All Pipe Flashings
Pipe penetrations are another frequent cause of roof leaks. Existing flashings should be inspected and replaced where necessary to provide a durable, watertight seal before solar panels restrict access to these areas.
Apply a High-Performance Waterproofing System
To maximise the service life of the roof, a high-performance waterproofing coating system should be applied following any necessary repairs. Systems such as the Rooflock Twelve HR coating system provide a waterproof coating specification that protects the roof from weathering, corrosion, and water ingress, helping to ensure the roof remains serviceable throughout the lifespan of the PV installation.
CONCLUSION
A PV solar installation is only as reliable as the roof beneath it. Taking the time to refurbish or replace an ageing metal roof before panel installation can prevent costly future repairs and maximise the lifespan of both the roof and the solar system. Addressing rooflights, fixings, flashings, and waterproofing before installation is a practical investment that delivers long-term benefits.