Signs Your Roof Is Failing (and Signs It's Just Dirty)

Some roofs look terrible but are structurally fine. Some roofs look great but are about to start leaking. Knowing which is which protects you from contractors who push replacement on a roof that just needs a cleaning, and protects you from ignoring real problems hidden under a tidy-looking surface.

Cosmetic problems (just dirty, not failing). (1) Black streaks on north-facing slopes — that's algae, not damage. Cleans with a soft wash and zinc strip prevention. (2) Moss on shaded areas — same thing; clean and treat. (3) Faded color — UV exposure dulling the granule color. Aesthetic only, not structural. (4) Minor granule shedding in gutters — some loss is normal, especially in the first few years and then again as the roof ages out.

Real failure signs you can see from the ground. (1) Curled shingle edges across multiple slopes — the shingles are losing their seal and lifting. Wind will finish them. (2) Cupping (center sagging) — moisture and heat have warped the shingle mat. (3) Bald spots where granules have completely worn off, exposing the asphalt mat. (4) Visible algae penetrating into the shingle (not just on top) — different from surface algae; this is shingle decay.

Signs visible from a ladder. (1) Lifted or missing tabs that the homeowner didn't notice. (2) Failed pipe boots or vent flashing — the rubber gaskets are cracked. (3) Step flashing pulled away from masonry at chimneys. (4) Daylight visible between courses where seal strips have completely failed.

Signs only visible from inside the attic. (1) Active staining on the underside of the deck. (2) Wet or matted insulation in localized areas. (3) Visible mold or mildew on the deck. (4) Daylight pinpricks through the deck or seam separations. (5) The smell of moisture or mildew in the attic space.

What to do. If you see cosmetic problems only — soft wash the roof (or hire someone) and install zinc or copper strips at the ridge to prevent algae regrowth. If you see any real-failure signs from the ground or ladder, get a professional inspection. If you see anything in the attic, get a professional inspection immediately — those are often the most expensive problems caught earliest.

Free inspections at Tri-State. We don't charge for assessment in NJ — and we tell homeowners honestly when their roof is fine and just needs a cleaning vs. when it really needs work. Building trust through honesty is how we get the next 20 years of referrals on the block.