Flat roof leaking in Phoenix? Call (480) 463-3483. We repair and replace flat and low-slope roofs of every common type: spray foam (SPF), modified bitumen, TPO and coated built-up roofs. That includes parapets, scuppers, ponding areas and blistered coatings. The inspection is free and includes photos and a written price. We hold ROC licences #356304 and #356639 and answer 24/7.
A flat roof is never truly flat. It is built with a slight fall toward drains or scuppers, and nearly every leak we find comes back to water that did not get there. This page covers flat and low-slope roofing only, for homes and light commercial buildings. Pitched tile and shingle repairs are on our general Phoenix roof repair page.
Flat roof repair in Phoenix: the systems we work on
| System | How it fails in Phoenix | Usual fix |
|---|---|---|
| Spray polyurethane foam (SPF) | Coating wears thin and UV attacks the foam; blisters; bird pecks; foot-traffic dents | Cut out damaged foam, refoam, and recoat the area or the whole roof |
| Modified bitumen | Seam laps open, cap sheet granules wash off, cracking at parapet base flashing | Heat-weld or patch seams, rebuild base flashing, add a reflective coating |
| TPO single-ply | Punctures, failed welds at corners and curbs, shrinkage pulling at edges | Hot-air weld a matching patch, re-detail curbs and terminations |
| Elastomeric and silicone-coated roofs | Coating chalks and cracks, delaminates over wet areas, ponding marks | Clean, repair the substrate, reinforce seams and recoat |
If you are not sure what you have, that is common. Many older Phoenix flat roofs are layered: an original built-up roof, foam sprayed over it later, and several coats of whatever was handy since. We cut a small core sample when needed to see what is there before we price anything.
Where Phoenix flat roofs leak
Parapet walls
Parapets are the low walls around the roof edge on Pueblo Revival and modern homes. The cap on top cracks, stucco takes on water, and that water runs down inside the wall and shows up on an interior wall, not the ceiling. We reseal or replace caps and carry the roofing up and over where the design allows.
Scuppers and drains
A scupper is the opening that lets water out through the parapet. Rust, gaps around the metal box and debris that narrows the outlet all cause backups. When a monsoon cell drops heavy rain fast, a partly blocked scupper turns the roof into a shallow pool.
Ponding
Water that stays more than a couple of days after rain ages coatings faster and finds every seam. On foam roofs we can often build up low spots with additional foam to restore fall. On membranes, tapered insulation or added drains are the long-term fixes.
Blisters and wet foam
A blister is trapped moisture or gas lifting the coating or membrane. Small, dry blisters can be cut and patched. Widespread blistering often means water is inside the roof. Our thermal inspections help map wet areas before we decide between repair and replacement.
Rooftop equipment
Package AC units, evaporative coolers, ductwork and their curbs sit on many Phoenix flat roofs. Condensate lines, unsealed duct penetrations and crushed foam around service paths cause a large share of leaks. We repair the roof and point out where a walk pad would protect it.
Water pooling or dripping from a flat roof?
Call now. We will talk you through clearing the scupper or drain safely and get the roof inspected.
Foam roof repair in Phoenix
Foam is popular here for good reason. It is seamless, light, insulating and can be sprayed to improve drainage. Its weak point is UV. The foam depends entirely on its coating, and once that wears through, the sun breaks the foam down quickly. Foam roofs typically need recoating every 5 to 10 years, depending on the coating used.
- Small damage: we cut out pecked, dented or blistered spots, fill with foam, and coat over.
- Worn coating, sound foam: clean, prime where needed, and apply a fresh coating system, often with embedded granules for durability.
- Saturated foam: remove wet sections down to the deck and respray.
Our silicone roof coating guide explains how silicone compares with acrylic coatings in Phoenix heat.
Recoat, repair or replace?
| What we find | Recommendation |
|---|---|
| One leak at a scupper, curb or parapet cap; rest of the roof dry | Targeted repair |
| Coating worn thin across the roof, substrate dry and well attached | Recoat (restoration) |
| Wet areas confined to sections; good drainage elsewhere | Remove and replace the wet sections, then recoat |
| Widespread saturation, several layers already, or chronic ponding | Tear off and replace, redesigning drainage |
Restoration is usually the most economical choice when the roof is dry underneath, so early action matters. For a full system comparison, see our guide to the best roof material for a flat roof. When the answer is a new roof, our roof replacement in Phoenix page explains the process.
What a flat roof repair costs
Flat roof pricing depends on the system, the size of the area, how many layers are already on the roof, whether insulation is wet, and how much equipment has to be worked around. We give a written price after the free inspection. Our FAQ on how much a flat roof costs in Arizona and the Phoenix roof replacement cost guide set out the factors, and financing is available.
Keeping a Phoenix flat roof dry
- Clear scuppers, drains and gutters before June 15, when monsoon season officially starts, and again after the first big storm.
- Look for bare spots, chalking or exposed foam each spring.
- Keep service technicians on walk pads or marked paths.
- Book a recoat when the coating wears thin, not after the foam is exposed.
More detail is in our flat roof maintenance guide for Arizona. Businesses with larger roofs can look at our commercial roof maintenance programs.
Flat and low-slope roofs around Phoenix
- Willo and nearby historic districts: Period Revival homes from the 1920s and 1930s, including Pueblo Revival houses with flat roofs and parapets.
- Mid-century neighborhoods: Ralph Haver’s Marlen Grove (1952) and Windemere (1955) have low-sloped roofs, while Marion Estates and Paradise Gardens mix flat and pitched rooflines. Low slopes like these are where foam and coatings work best.
- Arcadia: ranch homes on large lots, built after the citrus groves gave way in the mid-1950s. Additions, patio roofs and carports added over the decades can be low-slope even when the main roof is pitched.
- Light commercial across the city: offices, retail and warehouses with foam, TPO and modified bitumen. See commercial roofing in Phoenix.
Homes with a tile main roof and a flat section over a patio or addition are common. We fix both, and the tile side is covered in tile roof repair in Phoenix. For all services in the city, see our Phoenix roofing company page, or browse Arizona roofing services.
Permits and HOAs for flat roof work in Phoenix
Per the City of Phoenix’s published guidance, re-roofing with the same type of material as the original is exempt from a permit. Changing systems, for example from built-up to TPO, is outside that wording, so we check with the city before work starts and pull any permit needed. Historic-district properties cannot use online permits. Read our Arizona roof permit guide and building permits in Phoenix.
Flat roofs are usually hidden behind parapets, so HOA colour rules rarely bite, but many associations still require an application for any re-roof. Under A.R.S. § 33-1805 members can request the association’s records, which typically include its guidelines. Our HOA roof replacement guide covers the rest.
Phoenix flat and foam roof FAQ
How often does a foam roof need recoating in Phoenix?
Typically every 5 to 10 years, depending on the coating system and how much sun and foot traffic the roof gets. Recoating before the foam is exposed is far cheaper than repairing UV-damaged foam.
Can you repair a flat roof that has ponding water?
Yes. On foam roofs we can often add foam to the low areas to restore slope. On membrane roofs, clearing and resizing scuppers, adding drains or installing tapered insulation fixes the cause rather than just the leak.
Is it better to recoat or replace my flat roof?
If the roof is dry underneath and the substrate is well bonded, recoating is usually the better value. If insulation or foam is saturated over large areas, replacement lasts longer. Thermal or core testing tells us which you have.
Why does my flat roof leak at the wall and not the ceiling?
That often points to a parapet. Water gets in through a cracked cap or stucco and runs down inside the wall. Repairing the parapet cap and the base flashing where the wall meets the roof usually stops it.
Do you repair TPO and modified bitumen roofs?
Yes. We heat-weld TPO patches and re-detail curbs and edges, and we repair modified bitumen seams and base flashings. We also recoat bitumen roofs to protect the cap sheet from UV.
Do you work on commercial flat roofs?
Yes, including offices, retail and warehouses. Commercial projects often need roof access coordination and tenant notice, which we plan into the scope.
Get a flat roof inspection in Phoenix
We check drains, parapets, coatings and wet areas, then give you a written repair, recoat or replacement price.