Arizona homes come in three primary roof types: clay or concrete tile (the most common), low-slope or flat roofs, and metal roofs. Each presents different considerations for solar installation — cost, mounting method, flashings, and warranty implications all vary. Understanding your roof type helps you set realistic expectations and ask the right questions when getting quotes.
For the full step-by-step solar installation process, see our guide to going solar in Arizona. For cost context including roof-type adjustments, review our Arizona solar cost guide.
Concrete and Clay Tile Roofs
Tile roofs are predominant in Arizona — particularly S-tile (curved concrete or clay), flat concrete tile, and barrel tile. They're aesthetically popular, durable (50+ year lifespans), and reflect some heat — but they're more complex to work with for solar installation.
How Solar Is Installed on Tile
Installers cannot drill directly through tile — it cracks. Instead, they remove specific tiles, drill lag bolts through the roof deck into the rafters, install flashing and roof hooks, then replace or cut the surrounding tiles to fit around the mounting hardware. This process is more labor-intensive than shingle installation.
Tile Roof Cost Premium
- S-tile (curved): $400–$800 additional vs. shingle installation
- Flat concrete tile: $300–$500 additional
- Barrel tile (large format): $500–$900 additional
- Older brittle tile: May add cost due to breakage risk and replacement tiles
Key Questions to Ask for Tile Roofs
- Does the installer use a specific tile hook or through-tile flashing system?
- How do they source replacement tiles if the existing ones break? (tile matching can be difficult for older installations)
- Does the installation carry a waterproofing warranty at penetration points?
- Has your installer worked with your specific tile brand/style before?
Tile Roof Solar: Good News
- Tile provides natural airflow under panels — good for reducing panel heat in Arizona summers
- Tile roofs rarely need replacement during a 25-year solar system lifetime (unlike older shingle roofs)
- No need to "re-roof before solar" as you might with a shingle roof near end of life
Flat and Low-Slope Roofs
Flat roofs (common on commercial buildings and some Arizona contemporary residential homes) and low-slope roofs (2:12 pitch or less) use a different mounting approach entirely — ballasted or mechanically attached racking systems that sit on the roof surface without penetrating it.
How Solar Is Installed on Flat Roofs
Two primary approaches:
- Ballasted racking: Weighted trays hold down panel arrays without roof penetrations. Fast installation, no leaks, but adds significant weight load — a structural assessment may be required.
- Mechanically attached racking: Bolted through the roof membrane to the structural deck. More secure in high-wind conditions but requires waterproof penetrations.
Flat Roof Solar Advantages
- Tilt optimization: Panels can be tilted at the optimal angle (typically 10–20° in Arizona) regardless of actual roof slope
- Orientation freedom: Arrays can be oriented south regardless of which way the building faces
- Easy access: Maintenance and inspection are simpler on flat roofs
Flat Roof Considerations
- Roof membrane type matters — TPO, EPDM, and built-up roofs each have different waterproofing requirements
- Ballasted systems can be heavy — verify structural capacity with an engineer
- Drainage must not be blocked by panel arrays
- Row-to-row shading: Tilted panels on flat roofs must be spaced to avoid inter-row shading in winter when the sun is lower
Metal Roofs
Metal roofs — standing seam, corrugated, and metal shingle — are growing in Arizona due to their extreme durability and heat-reflective properties. Solar installation on metal roofs is generally favorable, often cheaper than tile, and does not require roof penetrations for standing seam profiles.
Standing Seam Metal: The Best Case for Solar
- Solar racking clips attach directly to the raised seams — no roof penetrations required at all
- No drilling = no leak risk from the installation
- Faster installation than tile
- Lower cost premium vs. shingle: often $0–$200 additional
- Metal roof lifespan (40–70 years) far exceeds solar system life — no reroofing concerns
Corrugated Metal and Metal Shingles
- Require penetration-based mounting (not seam-clip)
- Properly flashed penetrations are watertight but more complex
- Cost is similar to shingle installation
- Corrosion-resistant hardware is important at penetrations
Get a Roof-Specific Quote
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Get Your Free Quote →Roof Type Comparison for Solar
| Roof Type | Installation Complexity | Cost Premium | Leak Risk | Panel Airflow |
|---|---|---|---|---|
| Comp shingle | Low | — | Low (properly flashed) | Minimal |
| Concrete tile | Medium | $300–$500 | Low (with care) | Good |
| Clay/S-tile | Medium-High | $400–$800 | Low-Medium | Good |
| Standing seam metal | Low | $0–$200 | None (no penetrations) | Moderate |
| Corrugated metal | Medium | $100–$300 | Low | Moderate |
| Flat (ballasted) | Low-Medium | $200–$500 | None (no penetrations) | Excellent |
| Flat (penetrated) | Medium | $200–$500 | Low (properly done) | Excellent |
When to Re-Roof Before Going Solar
If your roof is near end of life, re-roofing before solar is far cheaper than re-roofing after. Removing and reinstalling a solar array for a new roof typically costs $1,500–$4,000 in labor alone. Rule of thumb:
- Re-roof first if: Your shingle roof is 15+ years old and in poor condition
- No need to re-roof if: You have tile, metal, or a relatively new shingle roof (under 10 years old in good condition)
- Get a roof inspection: Ask your solar installer to do a basic roof assessment — they should flag any concerns
Calculate Your System Cost
Our calculator provides cost estimates — use our quote process to get a roof-type-adjusted quote for your specific home.
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