Not every flat roof in Phoenix is foam. The repair — and the price — depends on what's up there. Identify it from the ladder in ten seconds, then read the right section.
White or tan, slightly orange-peel texture, no seams, soft give underfoot. Most Phoenix flat-roof homes. Foam repair →
Granulated rolls with visible 3-ft seams, often silver-coated. Common on 1990s–2000s additions and carports. Repair: seam reseal, patch, then a restoration coating.
Loose gravel over asphalt layers. Older central Phoenix and commercial. Repair: hard to find leaks; often best restored with foam over the top.
Bright white sheet with heat-welded seams. Commercial and some newer homes. Repair: seam re-weld, patch; coating at end of life.
Water still standing two days after rain is ponding, and ponding finds every weakness in any flat roof. Causes, in order: a blocked scupper or drain (clear it), a low spot (tapered foam or crickets), a sagging deck (structural). Most Phoenix ponding is the first one.
| Repair | Typical |
|---|---|
| Scupper clear and reseal | $150–$400 [est.] |
| Seam / flashing reseal (mod-bit, TPO) | $300–$900 [est.] |
| Foam spot repair | $300–$1,500 [est.] |
| Restoration coating over any system | $2–$4 / sq ft |
| Foam overlay (new roof over old) | $3.50–$9 / sq ft |
Start at the wet ceiling spot and go straight up, then uphill: water runs along the deck before it drops. Check penetrations, parapet corners and scuppers first; they cause most flat-roof leaks in Phoenix.
If the deck is dry and the membrane is sound but aged, a restoration coating or a foam overlay costs a fraction of replacement and adds years. If a core sample shows wet insulation, replacement or cut-out comes first.
Yes, after the loose gravel is removed and the surface is dry — one of the most common Phoenix conversions.
LAST REVIEWED 2026-11-01 · Prices on this site are published Valley rates and estimates, not a quote.