Flashing installation mistakes to avoid when mounting solar panels?

Proper Sealant Application

When installing flashing around solar panels, use a high-quality weatherproof sealant that meets or exceeds ASTM C920 standards. Apply a bead of sealant to the flashing edges and press firmly to create a watertight seal. Avoid over-tightening the sealant, as this can compromise its adhesive properties. In hot climates or areas with high UV exposure, use a sealant with a higher UV resistance rating, such as a silicone-based product. A minimum of 1/4 inch bead of sealant should be applied, and sealant should be applied at a minimum of 6 inches from the edge of the panel.

Structural Load Calculations and Panel Securing

When mounting solar panels, ensure the roof can support the structural load of the panels and the mounting system. Use a structural analysis software or consult with a structural engineer to determine the maximum load capacity of the roof. Secure the solar panels with a minimum of 2 lag screws per panel, spaced 12 inches apart, and ensure the screws are countersunk below the panel surface. Use a level to ensure the panels are properly aligned and secured to the mounting system. In areas with high winds or extreme weather conditions, use a mounting system with a wind-load rating of at least 150 mph.

Inspecting Flashing for Gaps or Damage

Before and after installing flashing around solar panels, inspect the flashing for gaps or damage. Check the flashing for any signs of wear or degradation, and repair or replace it as needed. Ensure the flashing is properly seated and sealed around the panel edges and any other penetrations, such as electrical connections or vents. Use a flashlight and visual inspection to check for any gaps or damage, and consider using a thermal imaging camera to detect any moisture ingress issues.