Asphalt roofs around Eau Claire usually last 18 to 25 years, a little under the national charts. InterNACHI’s life-expectancy chart for home inspectors puts 3-tab asphalt shingles at 20 years and architectural shingles at 30, and the Asphalt Roofing Manufacturers Association calls any home roof past 20 years a prime candidate for replacement.
The gap between the chart and the roof is mostly the attic. ARMA’s own manual says heat trapped under the shingles speeds their weathering, and that in northern winters household moisture rising into the attic can age shingles early. Both seasons work on a Wisconsin roof from underneath.
How long each type of roof lasts in Wisconsin
| Roof | InterNACHI chart | What to plan on around Eau Claire |
|---|---|---|
| 3-tab asphalt shingles | 20 years | 15 to 20 years |
| Architectural asphalt shingles | 30 years | 18 to 25, and 25 to 30 over a well-vented attic |
| Standing seam metal | 40 to 80 years (all metal) | 40 to 50 years |
| EPDM rubber (flat) | 15 to 25 years | 25 to 30 years with sound seams |
| TPO (flat) | 7 to 20 years | 20 to 30 years with maintenance |
| Modified bitumen (flat) | 20 years | 15 to 25 years |
InterNACHI labels its figures as guidelines, not guarantees, and says hail can shorten the life of any roof. The flat roof numbers depend on upkeep more than anything; the TPO and EPDM pages cover what decides them.
Why one roof lasts 18 years and the next lasts 30
The same shingle can land anywhere in its range. What moves it, in rough order of how much:
- Attic ventilation. Wisconsin’s dwelling code sizes attic venting by ceiling area, and plenty of older Eau Claire houses fall short of it. An attic that cooks in July and frosts in January wears the shingles from underneath. The attic ventilation guide works the math on a typical ranch.
- Layers. A second layer of shingles over the first runs hotter and does not last as long, by InterNACHI’s account, and the state code bars a new roof over two existing layers; the roof-over versus tear-off guide covers what a second layer gives up.
- Shingle grade. A 3-tab shingle is a single flat layer and comes due first, at 15 to 20 years here; architectural shingles, laminated from two or more layers, last longer on the same attic.
- Exposure. South and west slopes take the most sun and age first, which is why a roof often looks worn on one side and fine on the other.
- Storms. One bad hail day can take years off a roof that was on schedule; the hail damage roof repair page covers what gets fixed afterward.
The dark streaking on north slopes under trees is a different story. ARMA identifies it as algae and calls it an aesthetic consideration; the moss that can follow it on shaded slopes is what lifts shingle edges. Pressure washing the streaks off does shorten a roof, since ARMA notes that scrubbing or power washing strips the granules that protect the asphalt.
Signs you need a new roof
ARMA’s advice is to look from the ground with binoculars rather than climb up, and to check the attic for stains. What to look for, roughly in the order it shows up:
- Granules collecting in the gutters after every rain, more than a light dusting. The granules are the shingle’s UV shield; when they go, the asphalt goes next.
- Curling or cupping, corners turning up or centers sinking, which means the mat has lost its flexibility. That is not repairable.
- Cracked, bald, or missing shingles across the roof rather than in one spot.
- Leaks in more than one place. One leak is usually a flashing and a roof leak repair fixes it. Three leaks in three places in a year means the roof is running out.
- A soft or sagging deck, felt underfoot or seen from the attic, which is a problem under the shingles, not on them.
Ice dams do not belong on that list. They come from attic heat melting snow, and a new roof does not stop them on its own.
How to find out how old your roof is
The City of Eau Claire requires a permit to re-roof, and its online permit search takes an address, so a roof put on with a permit leaves a date behind. Outside the city, the roof permit guide lists which towns issue re-roof permits and where. The online records may not reach back to an older roof, and not every past roof was permitted, so check the house paperwork too: the seller’s disclosure, the home inspection report from the purchase, or a warranty registration left in a kitchen drawer. A leftover shingle bundle in the garage often has the product name on the wrapper.
A lifetime warranty is not a lifetime roof
“Limited lifetime” on a shingle wrapper means the life of your ownership. GAF defines it as the time the original owner owns a single-family home, and on its standard warranty a second owner is covered only if the warranty was transferred within the first ten years. After that ten-year period, labor drops out and payment shrinks with the roof’s age; GAF’s own example cuts a claim at 25 years by half. Owens Corning’s standard warranty likewise has a ten-year TRU PROtection period, with materials-only coverage after it, and a buyer has 60 days after closing to transfer it. CertainTeed’s Landmark carries a ten-year SureStart period that transfers free to the next owner. The warranty covers manufacturing defects; it does not promise the roof will last as long as its name.
When the signs above add up, the roof replacement page covers the tear-off, the timeline, and the cost.