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Tile Roof Solar — The Waterproofing Challenge
Installing solar on a tile roof involves penetrating or disturbing the tile course to make the structural connection to the rafter below. Every penetration is a potential water ingress point if not properly flashed and sealed. The CEC and installer accreditation requirements include specific training on tile roof waterproofing because tile roof leaks from poorly installed solar are a significant source of warranty claims.
Tile Hook Systems — Types
Hook Type | Compatible Tiles | Installation |
|---|---|---|
Raise-and-slide hook | Concrete and terracotta flat tiles | Tile is raised, hook slides under; lag bolt into rafter through tile; tile reinstated over hook stem |
Fold-over hook (L-bracket) | Corrugated concrete tile | Tile removed, L-foot bolted to rafter through roof, tile notched to fit over L-foot, tile reinstated |
Roof flashing hook | Any tile type | Tile removed, lead or EPDM flashing installed over rafter penetration, hook bolts through flashing |
Correct Waterproofing Procedure
Never install a hook by drilling through a tile and bolting directly into the rafter — this creates a water channel directly into the roof cavity
The hook penetration through the roof must be sealed with EPDM or lead flashing that laps under the course above and over the course below — directing water around the penetration
After installation, conduct a hose test: apply water to the area for 10 minutes and check the roof cavity below for any ingress
Use self-sealing lag bolt boots (rubber cone seals) on any bolt that penetrates the roofing felt or sarking
Tile Breakage Protocol
Any tiles broken during installation must be replaced with matching tiles before the installation is considered complete. Document the tile type, colour, and profile for the client so they can source replacement tiles for future maintenance. Broken tiles left in place cause chronic leaking and potential structural damage to the roof framing below.
Engr. Jason Morales — Founder, SolarEnergyPH
