The clearest signs you need a new roof are shingles curling, cracking or losing granules across whole slopes, leaks that come back in new places after repairs, a sagging roofline or soft deck, wet or stained wood seen from the attic, and a roof at or past the expected life of its material. One sign on its own usually means a repair; several together usually mean a new roof installation. To have yours assessed, call NEMA Roofing at 866-631-3366.
Which warning signs show on each roof material?
Walk around the house with binoculars on a clear day and look at every slope, not only the one facing the street. What matters is how widespread each sign is.
- Asphalt shingles: edges curling up or tabs cupping, cracks across many tabs, bald patches where the granules have worn off, and granules collecting in the gutters and at downspout outlets.
- Clay or concrete tile: many cracked, slipped or missing tiles, or dark underlayment showing between them. Tile itself lasts a long time; the underlayment under it ages first.
- Metal: rust that has gone through the coating on many panels, fasteners backing out across the roof, and seams opening.
- Flat roofs: blisters, cracks and open seams over large areas, and water still standing days after rain.
- The roofline: a ridge that dips or a slope that looks wavy.
For an asphalt shingle roof in particular, see when a home needs a roof re-shingle.
What do stains and damp wood in the attic mean?
Take a flashlight into the attic after a rain if you can do it safely. Look for:
- Dark stains or damp wood on the underside of the roof deck and rafters, especially at valleys, chimneys and vents.
- Daylight showing through the boards.
- Insulation that is wet, matted or stained.
- A musty smell or mold on the wood.
Stains in several places, or new ones next to spots that were already repaired, point to a roof whose layers are failing overall rather than one bad flashing.
When is a sagging roof more than a worn covering?
A sag means something under the covering has given way: deck boards softened by long-term leaks, rafters that are damaged or were undersized, or weight the roof was not built for, such as extra layers of old roofing. A new covering alone does not fix it. The rotted sheathing has to be replaced once the old roof is off, and damaged framing may need repair before the new roof goes on, which can bring in a structural review and the building department. Have a sagging roof inspected soon; do not walk on it.
Expected life by material: where is your roof?
| Material | Typical life | What to watch as it ages |
|---|---|---|
| Asphalt shingles | About 20 years (NAHB) | Granule loss, curling, brittle tabs that crack when lifted |
| Wood shakes | About 30 years (NAHB) | Splitting, cupping, moss; replacement roofs in fire zones need a Class A assembly |
| Metal | 30 to 50+ years (Metal Roofing Alliance) | Coating wear, rust at cut edges and fasteners, sealant at trim |
| Clay or concrete tile, slate | Over 50 years (NAHB) | The underlayment beneath, flashing, and broken pieces |
The National Association of Home Builders’ life-expectancy study notes that a roof’s life depends on local weather, how it was built and designed, material quality and maintenance, so age is a reason to inspect, not proof of failure. For more detail by material, read how long tile roofs last and how long a metal roof lasts.
When does another repair stop making sense?
| Points to a repair | Points to a new roof |
|---|---|
| Damage in one area, such as after a wind storm | Wear across most slopes |
| One leak with a clear cause (a pipe boot, a flashing) | Leaks returning in different places after repairs |
| Roof well within its expected life | Roof near or past its expected life |
| Deck solid underfoot | Soft or sagging deck |
| Matching materials still available | Discontinued shingles or tiles that cannot be matched |
Two more points often settle it. If you plan to add solar, a roof in its last years is better replaced first, so the panels do not have to come off later. And if the roof already has two layers, California’s residential code does not allow a third to be laid over them; the next roof starts with a full tear-off (CRC R908).
Which “signs” are often misread?
- Higher energy bills. The roof covering is only one factor; attic insulation and ventilation affect heating and cooling costs too, so check them before deciding on a new roof.
- A ceiling stain. It can come from an air conditioning drain line or a plumbing leak; check what sits above the stain.
- Dark streaks. They can be algae growing on the surface rather than wear; ask whether the shingles under the streaks are still sound.
- A few missing shingles after wind. Usually a repair, if the rest of the roof is sound.
From warning sign to new roof: the next steps
- Photograph what you see, inside and out.
- Book an inspection that ends with a written report and photos (see our roof inspection service).
- If the report points to replacement, compare written estimates that list tear-off, deck repair, underlayment, flashing and ventilation.
- Plan the work for dry weather, and ask for the start date, the number of working days and how the roof is kept covered overnight.
NEMA Roofing covers Santa Barbara, Ventura, Los Angeles, Riverside and San Bernardino counties in full, with teams at five locations: Santa Barbara, Oxnard, Woodland Hills, Tarzana and Downey. Learn about our new roof installation service, or call 866-631-3366 to book an inspection.
