Metal Roofing
Updated November 6, 2026
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Safety
Metal roofing work involves heights, sharp panel edges, and slippery surfaces, especially when wet or frosted. Stay off the roof, avoid touching damaged panels or exposed fastener tips, keep people and pets away from areas where debris or fasteners could fall, and never walk on panels during high wind, rain, or ice. If water is entering the living space, cut power to affected circuits and move belongings before placing containers to catch drips.
Before the visit
Before a scheduled visit, clear vehicles and items from the area below the suspected leak, unlock gates, and secure pets. Note when the problem appears, take photos from the ground, and gather any warranty documents, panel profiles, or color codes if available. Make sure attic or crawl space access is open so the technician can trace moisture paths, and confirm an adult will be home during the appointment window.
Repair vs replace
Repair is often reasonable when damage is limited to a few fasteners, a single panel, one flashing section, or a short seam run, and the underlying deck is still sound. Loose screws, popped washers, minor dents, small rust spots, and isolated flashing gaps can usually be corrected without replacing the whole roof, especially on systems less than halfway through their expected life.
When to replace
Replacement usually makes more sense when rust has spread across many panels, fastener holes are elongated, the deck shows widespread rot or sagging, seams have failed in multiple areas, or repair costs approach the price of a new system. Roofs near the end of a 40 to 70 year service life, or panels with extensive storm damage, may also justify full replacement.
Common issues
| Symptom | Likely causes | Safe check | Stop when |
|---|---|---|---|
| Water stains on ceilings or walls after rain | Failed seam seals, loose flashing, rusted-through panels, or missing fastener washers letting water past the roof | From the ground or with binoculars, look for lifted panels, displaced ridge caps, or rust streaks; inside, mark the stain edge and check the attic with a flashlight for damp insulation or drips | Water is dripping near electrical fixtures, the ceiling is bulging, or the attic shows active streaming during rain |
| Rattling or flapping panels in wind | Backed-out or sheared fasteners, broken clips on standing seam systems, or under-driven screws that never gripped the purlins | Listen during wind events and note which roof area is noisy; from the ground, look for panels sitting proud of the deck or visible gaps at seams | A panel edge has lifted enough to catch wind visibly, or pieces of trim or flashing have broken free |
| Rust streaks or red staining on panels | Scratched coatings, cut edges left bare, dissimilar-metal contact, or fastener washers that have degraded and exposed bare steel | Photograph streak locations from the ground and note whether they sit below fasteners, seams, or roof penetrations; avoid scraping or sanding the coating | Rust is flaking in sheets, panels show pitting or pinholes, or staining covers large sections of the roof |
| Oil-canning or visible waviness across panels | Thermal expansion stress, over-tightened fasteners, uneven decking, or panel widths that exceed the design span | Observe the ripple pattern at different times of day, since sun exposure changes its appearance; confirm it is cosmetic by watching for leaks or fastener movement nearby | Waviness comes with buckled seams, popped fasteners, or panels pulling away from trim |
| Loose or missing ridge caps and trim | Aged sealant, corroded closure strips, wind uplift, or fasteners that have backed out over repeated heating and cooling cycles | From the ground, check whether ridge lines look uneven or trim edges are raised; note any gaps where daylight or birds could enter the attic | Trim is hanging by one edge, flapping in wind, or has already detached from the roof |
| Leaks around chimneys, vents, or skylights | Cracked flashing boots, failed sealant joints, missing counterflashing, or snow and ice damming at penetrations | Inspect from indoors with a flashlight around penetration framing, and from the ground look for bent or separated flashing; keep a dated log of when moisture appears | Water is pooling around a chimney, a skylight frame is soft or discolored, or moisture is reaching electrical wiring |