Which Roof Types Work Best with Solar in Quezon City
QC has a limited menu of common roof types, and each one changes the mounting system, labor cost, and pitfalls of a solar installation. Here is what to expect on long-span metal, concrete flat-deck, tile, and shingle.
QC roof types by prevalence
Walk through any established QC subdivision and you will see four roof types repeated: long-span metal (by far the most common in mid-century and 1970s–1990s houses), concrete flat-deck or slab (common in modern 2000s+ builds, condo penthouses, and commercial buildings), concrete tile or clay tile (older mid-century houses and some premium subdivisions), and asphalt shingle (rare in QC, more common in some newer development styles). Each type sets a different envelope for solar installation.
Getting the roof type right on the initial site assessment matters because it drives the mounting system quote, the timeline, and the risk profile. A quote that specifies “standard mounting” without naming the roof-specific system is a warning sign that the installer either has not visited the site or does not distinguish between roof types.
Long-span metal — the easiest roof for solar
Long-span metal (rib-and-groove painted galvanized or galvalume) is the friendliest roof type for solar installation. Panels mount to standing-seam clamps or to L-brackets bolted through the corrugation into the roof rafters below. The install is fast, the sealing is straightforward, and the risk of leak long-term is low.
- Mounting system: non-penetrating standing-seam clamps (best) or L-brackets with EPDM gaskets and silicone sealant
- Typical install time: 2–3 days for a residential 5–8 kWp system
- Mounting hardware cost: ₱35,000–55,000 for a typical residential array
- Common pitfalls: installers using cheap L-brackets with under-spec sealants; look for tier-1 mounting hardware brands (Clenergy, Sunmodo, Solar Roof Hooks)
A long-span metal roof in good condition (no rust, no widening of the seam gaps, no soft spots) accepts almost any panel layout and orientation. The main constraint is the direction the ribs run — they set the orientation of the mounting rails, which in turn constrains the panel long-axis orientation.
Concrete flat-deck / roof-deck
Concrete flat-deck roofs — common in modern QC houses, commercial buildings, and condo penthouses — are the second-most common target for solar. They accept panels via ballasted mounting (weight-only, no penetrations) or via bolted mounts through the slab with membrane repair. Both work, with different tradeoffs:
- Ballasted mounting: tilt racks weighted down with concrete blocks or precast ballast. No roof penetrations, no leaks, easy to remove. Downside: adds significant dead load (30–50 kg/m²), so the roof structure must handle it. Not appropriate on marginal or older concrete roofs.
- Bolted / anchored mounting: tilt racks bolted into the slab with waterproof membrane repair at each penetration. Lower deadweight but each penetration is a potential future leak point if not sealed properly.
Flat-deck installations also let the installer orient panels for optimal solar angle (typically 10–15° tilt facing south-southwest in QC) rather than accepting whatever pitch the roof has. This can add 5–8% annual generation vs a flush-mount on an unfavorable pitch. On the other hand, a raised tilt-mount is more expensive per kWp than flush-mount because of the additional racking hardware and higher labor content.
Typical mounting hardware cost on flat-deck: ₱50,000–90,000 for a residential array, higher than long-span metal. Install time: 3–5 days.
Concrete tile and clay tile — more careful, more expensive
Tile roofs — the concrete or clay barrel tiles common in premium QC subdivisions like Ayala Heights, Corinthian Gardens, and some Loyola Heights and Blue Ridge blocks — require the most careful installation. Panels cannot mount directly to tiles; they need mounting hooks that pass under a lifted tile, anchor into the rafter below, and route up around a replaced tile.
- Mounting system: tile-specific hooks (Van der Valk, Schletter, or equivalent) with stainless-steel construction
- Typical install time: 4–6 days for a residential 5–8 kWp system
- Mounting hardware cost: ₱60,000–100,000 due to tile-specific hooks and replacement tile stock
- Common pitfalls: installers who use metal-roof brackets on tile roofs and rely on sealant to close the gap. This works for 6–18 months and then leaks. Insist on tile-specific hooks.
A tile roof in good condition is a fine platform for solar — tile roofs often outlast the solar panels — but the installation is inherently more expensive because the labor is slower and the specialized hardware costs more. Expect a tile roof installation quote to run 15–25% higher than an equivalent long-span metal installation.
Asphalt shingle — rare in QC, straightforward when it appears
Asphalt shingle roofs are uncommon in QC — more common in some newer subdivision development styles and in some cases where the original tile has been replaced with shingles. Where they exist, mounting is standard flashed-lag installation: L-foot brackets lag-bolted into rafters through the shingles, with aluminum flashing lapped under the upper shingle to shed water around the mounting point. Same install time and cost profile as long-span metal, roughly ₱35,000–55,000 in mounting hardware for residential.
Where asphalt shingle installations have failures: cheap flashing that oxidizes and separates from the shingle, and improper flashing installation that traps water rather than shedding it. Tier-1 flashing brands (SunModo, IronRidge FlashFoot) with proper installer training solve these.
Mounting systems per roof type
Every reputable installer uses tier-1 mounting hardware matched to roof type. Common brand+type pairings for QC installations:
- Long-span metal: Clenergy PV-ezRack SolarRoof or Sunmodo standing-seam clamps
- Concrete flat-deck: Clenergy Ballast or Solar Roof Hooks tilt-mount kits with waterproofing
- Concrete/clay tile: Van der Valk tile hooks, Schletter Rapid tile hooks, or SunModo tile hooks
- Asphalt shingle: IronRidge FlashFoot 2 or Sunmodo Nano-flashing
If your quote does not name the specific mounting hardware brand and model, ask. “Standard mounting hardware” is not a specification — it usually means the installer has not decided yet or is planning to spec the cheapest generic option. Roof leak repair 5 years after installation costs 10× what a good mounting spec costs up front.
Frequently Asked Questions
Can I install solar on an old rusting metal roof?
It depends on the extent of rust. Surface rust with a solid substrate is fine — the installer’s structural computation and mounting bracket layout can work around it, and you can address the rust cosmetically later. Deep rust with structural compromise (soft spots when walked on, obviously perforated ribs) means the roof should be replaced first. Installing panels over a failing roof means removing them later to replace the roof, which is expensive.
Does mounting through the roof always cause leaks?
Not with proper flashing and tier-1 hardware. Well-installed L-brackets with EPDM gaskets and quality sealant on metal roofs, proper flashing on shingle, and tile hooks that route around rather than through the tile on tile roofs — all have leak rates measured in fractions of a percent per installation over 20+ years. Cheap hardware with generic silicone sealant leaks at rates that would embarrass a plumber.
What if my roof has multiple pitches?
This is common on QC houses with additions and complex rooflines. It affects layout more than cost. A multi-pitch roof usually needs two or more independent sub-arrays with independent MPPT tracking on the inverter, or per-panel optimization via DC optimizers or microinverters. Design gets more careful but total costs typically go up by only 5–15%.
Should I replace my roof before installing solar?
Depends on remaining life. If the roof has 15+ years of life left, install solar over it. If it has 5–10 years of life left, replace it first — removing and reinstalling panels for a roof replacement costs ₱30,000–80,000 and doubles the disruption. Details in our old-roof-solar-decision guide.
Related guides
Not sure what your roof type will cost?
Send a photo of your roof and lot address. We can identify roof type, estimate roof-specific mounting cost, and flag any issues (aging metal, tile condition) before quoting the whole system. See our residential solar service →