You do not need a contractor to tell you roughly how much roof you have left. Five observable indicators, scored honestly, will put you within a few years — which is enough to budget, enough to decide whether to sell or replace first, and enough to know whether a replacement quote is premature.
The most reliable single measure. Granules are the shingle's only UV protection, and shedding them is how asphalt roofs age.
Clean your gutters, note what comes out, then check again after the next heavy rain. A handful of granules across a whole house is normal and happens throughout a roof's life. Half an inch of accumulated granule sediment in the bottom of a gutter run, or granules coming out by the cupful, means the surface is actively failing.
One caveat worth knowing: a brand-new roof sheds loose granules for the first few months. That is manufacturing excess, not failure.
Score: minimal = 0 points. Noticeable = 2. Heavy = 4.
This one is definitive and takes thirty seconds. From a ladder at the eave, gently lift the corner of a shingle.
A shingle with life in it flexes. The asphalt still contains volatile compounds that keep the mat pliable, and it will bend without complaint. A shingle at end of life cracks, snaps, or crumbles at the fold, because those compounds have gassed off and the mat has gone brittle.
Test in a shaded area rather than on a hot sunny slope, where warmth temporarily restores flexibility and gives a false reading.
Score: flexes cleanly = 0. Stiff but intact = 2. Cracks = 5.
Look across each slope at a low angle, from a distance, in raking morning or evening light. A healthy roof reads flat and uniform.
Curling is edges lifting upward — usually moisture and age. Cupping is the centre rising with edges down, often driven by attic heat or moisture from below. Clawing is the middle staying flat while edges lift, typically a sign of a roof that has been through many wet-dry cycles.
All three mean the shingle is no longer lying flat, which means wind can get under it and water can get past it.
Score: flat = 0. Scattered = 2. Widespread = 4.
Where granules have gone entirely, the black asphalt mat is visible. Those areas are now degrading rapidly, because nothing is shielding them from UV.
Pay particular attention below any surface that concentrates runoff — beneath a valley termination, under a chimney, below a metal flashing — and on the south and west slopes that take the most sun.
Score: none = 0. A few small patches = 2. Extensive = 4.
Find the roof's actual age from permit records rather than from the seller's estimate or a vague memory.
Then compare against realistic local expectations rather than the warranty number. Quality architectural shingle over a well-ventilated deck: 22 to 30 years. The same shingle over poor ventilation, heavy shade, or unmanaged moss: 15 to 20. Three-tab: subtract several years from either. A roof installed as a re-cover over an existing layer: subtract 20 to 40 percent.
Score: under half of expected life = 0. Half to three-quarters = 2. Past three-quarters = 4.
0 to 4: The roof is in its service period. Maintain it, keep moss and debris off, and re-check annually. Any contractor recommending replacement should be asked to point at specific defects.
5 to 10: Mid-to-late life. Start budgeting and get a documented inspection so component-level issues — boots, flashing, valleys — get caught while they are still cheap repairs.
11 to 16: Approaching or at end of life. Plan replacement on your schedule rather than after a leak forces the timing, which is invariably in February and invariably more expensive.
17 or above: Past due. Continued patching is unlikely to be economical.
It assesses the shingle surface only. A roof scoring zero can still have a failed vent boot, missing kickout flashing, or sheathing being quietly destroyed by attic condensation — none of which show up in surface condition.
Twenty minutes in the attic with a flashlight covers the other half, and the two together give you a genuinely informed picture before anyone quotes you anything.
This post is part of our in-depth coverage of roof inspection in Seattle.
Score five indicators: granules in the gutter, whether a lifted shingle flexes or cracks, cupping and curling across the slope, exposed black mat where granules are gone, and age against realistic Seattle service life of 22 to 30 years for quality architectural shingle over good ventilation.
We walk the roof, check the attic, and give you a written fixed quote. Serving Seattle and the greater Puget Sound region, open daily 7AM–8PM.
