7 Signs You Need Roof Repair (and What to Do)

1. Water stains on ceilings or walls

A brown or yellowish ring on a ceiling, or a soft streak running down an interior wall, is the sign homeowners notice first, and by the time it shows up, water has already been getting in for a while. Water travels along rafters and decking before it drips, so the stain is often several feet from the actual entry point on the roof.

In our climate these usually appear during or right after the first real winter storms, which is why they feel sudden. What to do: photograph the stain, note whether it grows during rain, and get an inspection before the next storm. Do not just repaint over it, because that hides the evidence a roofer uses to trace the leak.

2. Cracked, slipped, or missing tiles

On a tile roof this is the most visible warning sign and, thanks to our Santa Ana winds and years of foot traffic from solar and satellite installers, one of the most common. A single cracked tile may not leak immediately, but it exposes the underlayment beneath to direct sun and water, and that spot begins failing faster than the rest of the roof.

Slipped tiles that have slid out of alignment leave a gap, and missing tiles leave the underlayment fully exposed. What to do: from the ground with binoculars, scan for tiles that are out of line, obviously broken, or sitting at a different angle than their neighbors, especially after wind. Replacing a few tiles is a small job; letting the underlayment cook under a gap is not.

• Cracked tiles expose the underlayment to sun and water
• Slipped tiles leave gaps that channel water underneath
• Missing tiles are urgent, especially heading into winter

3. Rusted, lifted, or failing flashing

Flashing is the metal that seals the roof where it meets something else: chimneys, walls, skylights, and valleys. In coastal North County it is usually the first thing to fail, because salt air corrodes metal from the outside in. We frequently find roofs where the tile is sound but the flashing behind a chimney or along a wall has rusted through or pulled loose.

Lifted flashing, where the metal edge has separated from the surface it was sealed to, opens a direct path for wind-driven rain. What to do: if you can safely see flashing that is rusty, bent up at the edges, or has cracked, dried-out sealant, treat it as a repair priority. Flashing repair is far cheaper than the water damage a failed flashing causes over one wet winter.

4. Granules or grit collecting in the gutters

If any part of your roof uses composition shingle, or if you have shingle sections mixed with tile, sandy granules building up in the gutters and at the base of downspouts mean the shingles are shedding their protective surface and nearing the end of their life. On a tile roof, you may instead see fragments of tile or crumbling ridge mortar, which point to cracking and wind damage.

It is easy to miss because it looks like ordinary dirt. What to do: when you clean the gutters in the fall, look at what comes out. A little is normal for aging shingle; a lot, concentrated below certain slopes, tells you where the roof is wearing fastest and where to focus an inspection.

5. Daylight, moisture, or stains in the attic

The attic is where a roof tells the truth before the ceiling does. Go up on a bright day and look for pinpoints of daylight through the decking, dark water stains or streaks on the underside of the wood, rusty nail tips, or matted, damp insulation. Any of these means water or air is getting through where it should not.

Be careful to separate a leak from a ventilation problem: broad, even dampness on the underside of the decking is often trapped marine-layer moisture, while a localized stain that runs downward points to an actual leak above. What to do: mark the wet spot, and if it lines up under a penetration, valley, or wall, that is where the repair belongs. Bring in a roofer to confirm before opening anything up.

• Pinpoint daylight through the decking means a gap or hole above
• Localized downward stains point to a real leak
• Broad even dampness is usually a ventilation issue, not a leak
• Rusty nail tips signal chronic condensation

6. Sagging rooflines or soft spots

A roofline that dips, waves, or sags is a structural warning and the most serious sign on this list. It usually means water has been getting into the decking or framing long enough to rot the wood, and the roof is literally losing its support. On tile roofs, a localized sag can also mean the structure is straining under the weight where decking has weakened.

This is not a wait-and-see item. What to do: if you can see a sag from the ground or feel a spongy, soft area if you are on the roof, stop and call a professional promptly. Structural repairs are far more involved than a flashing or tile fix, and the cost only climbs the longer the wood stays wet.

7. Moss, lichen, or plant growth on shaded slopes

Our marine layer keeps north-facing and shaded slopes damp for hours every morning, and that is ideal for moss and lichen, especially on older concrete tile. Green or crusty growth is not just cosmetic: it holds moisture against the roof surface and works into the overlaps between tiles, and its roots can pry at the material over time.

What to do: growth is a sign that slope is staying too wet and deserves attention, but do not blast it with a pressure washer. High-pressure water drives moisture under tile and strips protective surfaces. Have it cleared gently and treated, and pair it with trimming back any overhanging branches that keep the area shaded and damp.

What to do next, and when it becomes urgent

Most of these signs mean the same thing: get eyes on the roof before the next storm rather than after the next leak. Document what you see with photos, note whether it changes during rain, and avoid climbing onto tile yourself, both for your safety and to keep from cracking more tile. A professional inspection turns a list of symptoms into a specific, prioritized repair.

A few things are genuinely urgent and should not wait for a scheduled visit: an active leak dripping into the home, a visible sag in the roofline, or missing tiles with rain in the forecast. In those cases the priority is preventing further water intrusion, and a temporary protective measure now can save the ceiling, insulation, and framing while a permanent repair is arranged.

• Photograph each sign and note whether it worsens during rain
• Do not walk tile yourself; you risk injury and more cracked tile
• Treat active leaks, sagging rooflines, and missing tiles as urgent
• Schedule repairs before winter, when access is safe and dry

Key takeaways

• Interior ceiling and wall stains usually mean water has been entering for a while, often several feet from the real leak.
• Cracked or slipped tiles expose the underlayment and speed up failure, so replace them promptly.
• In coastal North County, corroded or lifted flashing is the most common single cause of leaks.
• Granules in the gutter signal shingle wear; tile fragments and crumbling mortar signal tile and wind damage.
• The attic often reveals a roof problem before the ceiling does, but separate real leaks from ventilation dampness.
• A sagging roofline is a structural emergency and needs a professional right away.
• Active leaks, sagging, and missing tiles before a storm are urgent; everything else should still be inspected before winter.

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