Roof Types and Solar Mounting in the Philippines

Mounting method depends on what your roof is made of. Rib-type (corrugated) metal, the most common roof in the Philippines, needs rails bolted through the sheet into the structural purlins underneath. Concrete decks take embedded or ballasted brackets straight into the slab. Tile roofs need hook brackets anchored under the tiles, which costs more in labor. Across all three, the mounting hardware should be engineered to survive roughly 200-250 kph winds, with 250 kph in typhoon-corridor provinces (Eastern Visayas, Bicol) and about 200 kph as the nationwide floor under NSCP 2015, since a system that looks fine on a normal day can fail in the exact weather it’s most likely to face.

How does mounting work on a rib-type (corrugated) metal roof?

Rib-type or corrugated metal is the roof you’ll see on most Filipino houses, and it’s a solid surface for solar as long as it’s done right. The rails carrying the panels get screwed through the metal sheet and into the purlins, the horizontal structural beams underneath, not just clamped onto the raised ribs of the sheet itself. The sheet alone can’t carry the combined weight of the array plus wind uplift. Installers also seal every penetration point to stop leaks, since a bolt through a metal roof is a potential entry point for rain if it’s not flashed properly.

How does mounting work on a concrete roof deck?

Concrete flat roofs and roof decks are usually the most straightforward surface to mount on. Brackets either get embedded into the slab with chemical anchors or, on some flat decks, ballasted (weighted down) without penetrating the concrete at all. Because there’s no purlin spacing or sheet metal to work around, concrete decks tend to give installers the most flexibility on panel layout and are often the cheapest roof type to mount on.

How does mounting work on a tile roof?

Tile roofs (clay or concrete tile) look good but are the most fragile and the most expensive to mount on. Installers typically lift a run of tiles, install hook brackets that anchor directly into the rafters below, then set the tiles back around the hooks. Tiles crack easily if handled roughly during this step, so labor time and cost both run higher than on metal or concrete. If your home has a tile roof, expect your installer to quote extra for this.

What wind rating should Philippine solar mounting have?

The Philippines sits in a typhoon corridor, so mounting hardware here needs a higher wind rating than in most countries. The National Structural Code of the Philippines (NSCP 2015) sets basic design wind speeds across the country’s wind zones at roughly 200 to 250 kph, with 250 kph in typhoon-corridor provinces like Eastern Visayas and Bicol and about 200 kph as the nationwide floor. Reputable mounting systems use more attachment points per panel than the bare minimum, and thicker rails, to hold up under sustained gusts rather than just the average condition. This matters more than the panels themselves in a typhoon: modern panels are rated for high wind pressure on their own, but a system only survives a storm if the rails, clamps, and roof penetrations underneath do too. For what to do around backup power during and after a typhoon, see our typhoon and brownout backup guide.

Does mounting type affect installation cost?

Yes, noticeably. Concrete decks and standing-seam metal roofs are generally the cheapest to mount on since they need the least extra labor. Rib-type metal costs a bit more because of the added purlin attachment work. Tile roofs cost the most due to tile removal, hook installation, and the care needed to avoid cracking tiles. Roof type is one of several things worth asking about upfront, alongside panel brand and warranty terms, when you’re choosing a solar installer.

Does roof type limit where panels can go?

Sometimes. Purlin spacing on older metal roofs, tile fragility, or uneven roof sections can all shift where an installer recommends placing panels, sometimes away from the spot with the best sun exposure. Combine that with shading from trees, water tanks, or a neighboring structure, and the ideal layout on paper doesn’t always match what the roof allows. See our guide on how shading affects solar output for why avoiding even partial shade matters more than most homeowners expect.

What should you ask your installer about your specific roof?

Ask what your roof’s purlin spacing and condition are, whether reinforcement is needed before mounting, what wind rating the mounting hardware carries, and how many attachment points per panel they’re using. A PCAB-licensed installer should be able to answer all of this from a site survey, not a satellite photo estimate, and should put the mounting spec in writing as part of your quote.