Most solar in the Phoenix metro sits on concrete tile — and tile is the least forgiving roof there is to bolt equipment through. The tiles themselves are brittle. The real waterproofing is the underlayment underneath them. And a solar mount done lazily on tile does not fail on day one; it fails invisibly for years, then shows up as a ceiling stain long after the installer’s truck — and sometimes the installer’s company — is gone.
Why tile is different
On a shingle roof, a mount flashes into the shingle field and the failure modes are visible. On tile, the mount has to reach through the tile layer to the structure beneath, which means the tile is cut or lifted, the attachment lands on the deck, and the waterproofing story happens at the underlayment level where nobody can see it. Every shortcut is invisible at handover. That is exactly why shortcuts get taken.
What a correct tile mount looks like
- The attachment anchors to structure — lagged into rafters to engineering spec, torqued to the manufacturer’s number, not “tight.”
- Deck-level flashing. Real flashing integrated with the underlayment carries water around the penetration — sealant alone is not a flashing.
- Three-course sealing on the penetration — sealant, reinforcement, sealant — so the waterproofing does not depend on a single bead of caulk surviving 20 Arizona summers.
- Profile-matched hardware. Modern tile hooks and profile-matched flashings let the tile sit back down properly; grinding a tile until something fits is how water finds a channel.
- Cracked tiles replaced, not glued. Tiles break during any roof work — the question is whether the crew carries and swaps them, or hides them.
How bad mounts actually fail
Three ways, all slow. Leaks: water tracks down an unflashed lag bolt into the underlayment, rots a small area for years, and surfaces as a stain far from the actual hole. Movement: an under-torqued or mis-anchored mount works loose in monsoon wind, and every wobble grinds the sealing a little more open. Broken tiles: cracked during install and left, they channel water straight to the underlayment beside the mount. None of these show up in year one. All of them show up eventually.
Talking to us costs nothing
Exact detach & reset quotes are free and same-day from your address, panel count and a roof photo. Diagnostics are $199, full inspections $299 — always quoted in writing before any work.
Get a Free Quote (480) 270-2745When to look, and who should
Two honest moments exist to verify what is under your array. The first is a $299 inspection — we photograph mounts, flashing and the roof around the array and put the findings in writing, which matters double if your original installer is out of business. The second is any time the panels are already off: during a re-roof the array comes down anyway, old-style standoffs can be upgraded to current-spec mounts, and the new underlayment plus correct mounts reset the whole clock together.
The takeaway
On tile, the mount is the roof protection. Sixty properly flashed, torqued, three-course-sealed penetrations are a non-event for decades — and our work on them carries a 100% money-back no-leak guarantee, because that is a promise a company can only afford to make when the mounts are done right.