Spanish & S-Curve Clay Tile Roof Solar Mounting Guide (Tile Replacement vs Hooks)
Brittle S-curve clay tiles in California, Arizona, Florida, and Texas are the #1 source of solar roof leaks when crews walk heavily on the barrels or grind notches for cheap tile hooks. Learn why you must mandate Aluminum Tile Replacement Flashings or a 'Picture-Frame Comp-Out.'
Cross-Sectional Roof Attachment & Flashing Schematic
Torque & Fastener Spec: 5/16'' x 4'' Stainless Lag Screw into centered 2x4/2x6 rafter + 40-year synthetic SBS underlayment seal
[Solar Panel] ---> [XR100 Rail] ---> [ Aluminum Stanchion Post ]
||
(Clay S-Tile) [ Formable Aluminum Replacement Tile Flashing ]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~||~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ Sub-Deck Primary Lead/Aluminum Boot ]
==============================||================================== <-- 2x Layers 40-lb / Synthetic Underlayment
##############################||################################## <-- OSB / Plywood Roof Deck
[ 2x6 Roof Rafter (5/16'' Lag Bolt) ]✅ Roof Warranty Protection Checklist (GAF / Owens Corning / Metal)
- ✓Inspect the age of the black felt underlayment beneath the clay tiles BEFORE signing—clay tiles last 60 years, but cheap 30-lb felt rots in 18 years.
- ✓Prohibit 'cut-and-caulk' tile grinding where installers notch your clay tile with an angle grinder and squirt polyurethane caulk.
- ✓Require either (A) Metal Tile Replacement Flashings (QuickMount/IronRidge) with deck-level sub-flashing, or (B) a 'Comp-Out' (removing clay tiles under the array footprint, laying 2 layers of peel-and-stick + architectural shingles, and stacking spare clay tiles around the perimeter).
🚩 Subcontractor & Salesperson Red Flags
- ✕Contract limits tile breakage or tile-roof leak warranty to '90 days' or '1 year.'
- ✕Crew walks on the high center crown of hollow clay barrels instead of stepping on the overlapping lower bottom third.
Step-by-Step Mounting Protocol & Engineering FAQs
🛠️ MOUNTING STEP1. Underlayment Forensic Inspection
Lift 3 clay tiles on the south/west plane. If the felt paper crumbles when pinched, perform a 'Solar Footprint Re-Felt / Comp-Out' before mounting rails.
🛠️ MOUNTING STEP2. Install Deck-Level Sub-Flashing + Tile Replacement
Bolt the base plate into the rafter, seal to the underlayment with a primary deck flashing, and install the aluminum S-tile replacement over the course.
❓ ROOFER FAQWhat is a 'Comp-Out' on a Spanish clay tile roof?
A Comp-Out (Composition Shingle Inset) is where roofers carefully remove the fragile clay tiles only in the rectangle where solar panels will sit, install new synthetic underlayment and asphalt shingles with double-flashed solar mounts, and picture-frame the clay tiles tightly around the array edges. It eliminates broken clay tiles and gives you dozens of spare matching tiles.
Explore Other Roof Mounting Blueprints
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