Signs You Need a New Roof: What to Check Outside and in the Attic

The clearest signs a roof is nearing the end of its life are shingles that are cracked, curling, buckling or missing across large areas, heavy granule loss showing up in the gutters, a roofline that sags, and water stains inside the house or on the underside of the roof deck. Age matters too: NRCA, the roofing contractors' association, says most new roofs are designed to provide useful service for about 20 years, with slate, clay tile and certain metals lasting longer ¹.

One sign alone rarely settles it. NRCA points out that a leaking roof does not necessarily need to be replaced, because leaks can come from loose flashings or one damaged section ¹. What tips the balance toward replacement is wear spread across the whole roof, damage to the deck or structure, or repairs that keep coming back.

Signs you can see from the ground

NRCA recommends checking the roof in the spring and fall, from the ground or a firmly braced ladder rather than the roof itself, for cracked or curling shingles and to clear gutters ¹. Things to look for:

• Cracked, warped or missing shingles. NRCA lists these among the problems regular inspections uncover ¹. A few missing shingles are a repair; widespread cracking and curling are wear.
• Buckling or wavy shingles. ARMA, the asphalt shingle makers' trade group, lists shingle buckling caused by deck movement among the results of poor attic ventilation ³.
• Shingles that will not lie flat. ARMA says that when old shingles are so uneven and distorted that new ones could not be made to lie flat over them, the old ones will probably have to come off ².
• A sagging ridge or roofline. ARMA says a roof sagging across the ridge or truss lines should have its structure checked by a qualified engineer ². Fixr notes that a sagging roof indicates some kind of structural damage ⁶.
• Damaged or loose flashing at chimneys, walls and vents. NRCA includes deteriorated flashings in its list ¹. See roof flashing explained.
• Heavy moss. Fixr notes that moss can lift shingles and increase the risk of water damage ⁶.

The Metal Roofing Alliance, a metal roofing industry group, gives a similar list: sagging, missing or loose material, exposed or loose nail heads, leaks, water damage, missing or damaged flashings, and age ⁷.

Granules in the gutters

Asphalt shingles are surfaced with mineral granules. NRCA lists excessive granules accumulating in gutters or downspouts as one of the visible signs of a problem that inspections can catch ¹. How much is too much depends on the shingle and its age, so ask the roofer to look at the gutters and the shingle surface together.

Signs inside the house and the attic

• Ceiling and wall marks. NRCA says to look indoors for cracked paint, discolored plasterboard and peeling wallpaper as signs of damaged roof areas ¹.
• Stains on the underside of the deck. In NRCA's reroofing guidance, stains, rust, mold and degradation on the underside of the roof deck generally indicate there is or has been a problem such as moisture or leakage ⁵.
• Moisture and mold in the attic. ARMA says that when moisture vapor stays in a cold attic it can condense and damage the roof deck and insulation, and can lead to mold ⁴. ARMA ties this to attic ventilation; see roof ventilation explained.
• Rotting wood. ARMA lists rotting wood members and moisture in the deck and insulation among the results of poor ventilation ³.

Signs that point to a repair instead

• One leak in one place, especially around a chimney, vent pipe or skylight, which can trace to loose flashing ¹.
• A few missing or damaged shingles on an otherwise flat, intact roof; Fixr counts replacing some shingles as a minor repair ⁶.
• A cracked vent boot. Fixr lists vent repair at $75 to $250 ⁶.

Fixr reports minor roof repairs, such as replacing some shingles, repairing a vent boot or fixing a small leak, at $150 to $1,000, moderate repairs at $1,000 to $3,000, and major repairs at $2,000 to $6,000 (updated January 21, 2026) ⁶. Fixr's view is that if a roof is over 15 years old and showing frequent problems such as leaks, missing shingles or sagging, replacement may be more cost-effective than repeated repairs ⁶. Our repair or replace a roof guide walks through that decision in detail, and roof leak repair cost covers the repair side.

When the deck is the problem

Some signs mean the roof cannot simply be covered over. ARMA says rotted or warped wood or large gaps in the deck, more than two existing layers, and a sagging structure all point to removing the old shingles ². NRCA does not recommend installing a new roof over a damaged or deteriorated deck ⁵. Our article on tear-off vs. roof-over explains what the building code allows.

What to do next

• Write down the roof's age if you know it, and note which signs you see and where.
• Stay off the roof. NRCA advises homeowners to limit their own maintenance to checking from the ground or a ladder and cleaning gutters, and to leave roof work to professionals ¹.
• Get more than one opinion. NRCA suggests getting three or four proposals from contractors in your area ¹.
• Ask each roofer to show you, with photos, what they saw and why it points to repair or replacement.

If replacement is the answer, the types of roofing materials guide covers the options, from architectural shingles to metal. You can compare quotes from roofing companies to see what a new roof would cost on your house.

About these figures

• ¹ Reported: NRCA consumer answers on the roughly 20-year design service life of most new roofs, leaks that do not require replacement, visible signs to look for inside and out, spring and fall checks, and getting three or four proposals, checked November 11, 2026.
• ² Reported: ARMA technical bulletin on when old shingles will probably have to be removed (deck damage, more than two layers, sagging, distorted shingles), revised May 2017, checked November 11, 2026.
• ³ Reported: ARMA on problems caused by poor attic ventilation, including buckling and rotting wood, checked November 11, 2026.
• ⁴ Reported: ARMA ventilation fast facts on attic condensation, deck damage and mold, checked November 11, 2026.
• ⁵ Reported: NRCA's Professional Roofing article on reroofing, on stains and degradation under the deck and not recovering over a deteriorated deck, checked November 11, 2026.
• ⁶ Reported: Fixr roof repair cost guide, repair ranges of $150 to $1,000, $1,000 to $3,000 and $2,000 to $6,000, vent repair at $75 to $250, and its notes on sagging, moss and roofs over 15 years old, updated January 21, 2026, checked November 11, 2026.
• ⁷ Reported: Metal Roofing Alliance FAQs, list of signs it may be time to reroof, checked November 11, 2026.