Roof Repair

How Roof Repair Works, Step by Step

Most repairs take two visits. The first is diagnosis: a roofer walks the rooftop, then reads the underside of the roof deck from the attic, because water rarely enters where the ceiling stain appears.

1. We set a ladder, anchor a safety harness at the ridge, and work from scaffold or roof boards instead of kneeling on shingle that is too hot to touch.
2. A pry bar and roofing shovel lift the damaged field course without tearing the rows above it.
3. We cut back to sound material, then check the substrate — plywood or OSB sheathing — for soft spots, rot, and delamination.
4. Rotted roof deck gets replaced and fastened with ring-shank nails from a nail gun, not spot-nailed by hand.
5. Synthetic underlayment covers the repair zone, and ice-and-water shield lines the valley where two roof planes meet.
6. Flashing goes back in order: step flashing at the sidewall, apron flashing at the headwall, counterflashing tucked into the masonry.
7. Pipe boots, vent boots, and chimney flashing get new collars and a urethane sealant bead instead of a smear of roof cement or mastic.
8. The drip edge at the eave and rake is reset, the ridge cap goes back on with hand-sealed fasteners, and we caulk every penetration before sweeping the gutter and hauling debris to the dumpster.

What a Roof Inspection Actually Checks

A repair only holds when it targets the real failure, so we inspect the whole weatherproofing envelope instead of the wet spot on your ceiling. Here is what each finding usually means.

• Underlayment and roofing felt — the tar paper under your tile — that has flaked or gone brittle, letting water wick straight to the deck.
• A sagging roofline, which usually points to a wet rafter, joist, truss, or ridge beam that has begun to settle under load.
• End-of-life wear on three-tab shingle and architectural shingle: curled corners, exposed nail heads, and granule loss collecting in the gutter.
• Wood shake or cedar shake that has split and decayed, or slate and tile where one cracked unit has become a systemic leak.
• Metal panel, standing-seam panel, and corrugated panel with backed-out fasteners, corroded purlins, and screw gaskets that have dried out.
• Flat roofing with ponding water — TPO, EPDM, and PVC membrane seams that have peeled or blistered at the lap.
• Built-up roof and modified bitumen that has alligatored, where old tar and bitumen no longer shed water.
• Ridge vents, soffit vents, and attic fans blocked by crushed insulation, which bakes the deck from underneath.
• Gutter and downspout runs that dump at the fascia and soffit instead of carrying water away from the foundation.

Materials, Roof Types, and the Tools That Do the Job

We match each repair to what is already overhead. Mixing an asphalt shingle patch into a tile field never looks right, and it never seals right either.

• Asphalt shingles from GAF, Owens Corning, and CertainTeed cover most Phoenix homes, so we carry matching three-tab and architectural profiles.
• Tile roofing — clay tile and concrete tile — gets broken units relayed and re-bedded, not patched over with mastic.
• Low-slope and flat roofing uses modified bitumen, a built-up roof, or a single-ply membrane, plus a reflective coating when a recoat beats a tear-off.
• Metal roofing repairs use matched panels, with damaged standing-seam or corrugated sections rebuilt to the right batten and counterbatten spacing.
• Penetrations get real parts: pipe flashing, boot flashing, an apron flashing at the headwall, and counter-flashing where stucco meets the roof.
• Roof features we work around include the skylight, dormer, parapet, chimney, and the scupper and coping on a commercial flat roof.
• Roof shape drives the flashing plan: hip, gable, mansard, and gambrel roofs each drain differently, and the verge, ridge, rake, and overhang all need attention.
• A patio canopy or awning ties into the main roof at a wall, which is one of the most common leak points we find.
• We check the vapor barrier and attic ventilation whenever a repair opens a ceiling, because trapping moisture is worse than the leak we came for.
• Tool kit: roofing square for layout, air compressor and nail gun for production fastening, pry bar, roofing shovel, torch for modified bitumen detailing, and a caulk gun loaded with adhesive-grade caulk.

Phoenix Conditions That Change Every Repair

Maricopa County is one of the sunniest major metros in the country — about 3,872 hours of sunshine a year — and that UV load photo-degrades shingles, elastomeric coatings, and underlayments long before they reach a normal service life.

• Sustained heat accelerates oxidation in asphalt and dries out the bitumen and underlayment beneath tile, so we check the deck, not just the surface.
• Phoenix averages roughly 111 days a year at or above 100 F, so we schedule tear-off work early and stage material in shade.
• Hail is a recurring monsoon risk; the 2025 season brought hail to the Phoenix area and damaged more than 500 homes in Tempe alone.
• Driving monsoon rain finds the valley first, so a low-slope transition or a clogged scupper can flood a roof that looked fine in June.
• Ice dams are not a Phoenix problem, but summer rain can back up the same way, which is why we still run ice-and-water shield at eaves and valleys.
• Dust, palm fronds, and construction grit collect behind the chimney and in the gutter, holding moisture against the metal.
• Snow guards and heat cable are cold-climate hardware; if you have them on a shaded porch roof, we reset them with the same sealed fasteners we use on a ridge cap.

Timelines, Cost Drivers, and When We Tell You Not to Repair

Most repairs finish in a single day. Our roof estimates are free and written line by line, so you can see what the flashing, decking, and labor actually cost before you commit.

• Flashing and sealant work with no shingle removal: one visit, about half a day.
• A section rebuild with a partial tear-off, new underlayment, and new shingles: one to two days.
• Storm damage with several penetrations or rot in the decking: two to three days, weather permitting.
• Cost climbs with pitch and access — a steep two-story roof takes longer than a walkable single-story, and a tight lot means more ladder and harness time.
• Decking repairs add cost per sheet of plywood, and matching a discontinued shingle color sometimes means a wider tear-off for a uniform look.
• Insurance claim assistance comes standard on storm work: we log the storm date, photograph the damage, and meet the adjuster inspection.
• Repair is the wrong call when shingles are at end-of-life across the whole plane, the deck feels soft underfoot, or we find three or more separate leaks.
• Maintenance tips we give every homeowner: keep the valley and gutter clear, trim overhanging branches, and re-check sealant at penetrations each spring before monsoon season.
• Energy efficiency matters here too — a reflective roof coating and proper attic insulation cut heat gain, and reusable tile and decking get salvaged on tear-offs instead of going straight to the landfill.
• A roofing contractor who quotes a full replacement without opening the attic is guessing. We will tell you when a small repair is the honest answer, and when it is just money spent twice.