When a homeowner in Tomah, Wisconsin, calls about a failing asphalt roofing system, the conversation almost always focuses on the shingles. But a significant number of asphalt roofs that fail earlier than they should, have nothing wrong with the shingles themselves. The problem is in the attic. Poor ventilation is one of the most common and least talked about reasons asphalt roofs in Wisconsin age out ahead of schedule, and it is something most homeowners have no idea is happening until the damage is already done. At Golden Eagle Roofing, we check ventilation on every roof assessment because what is going on up there directly affects how long the shingles last down here. Call us at 608-633-6719 to have your roof and attic looked at together.
Key Asphalt Roofing Problem: Attic Ventilation
Most people think of attic ventilation as a summer comfort issue. Hot attic equals hot house. That is part of it, but the roofing side of the equation matters just as much. An attic that does not breathe correctly creates problems for asphalt shingles in both summer and winter, and Wisconsin’s climate pushes both seasons to extremes. The good news is that ventilation problems are identifiable and fixable, often without tearing anything off the roof. The bad news is that they tend to go unnoticed for years while the damage quietly accumulates. Golden Eagle also handles commercial roofing for business owners across the Tomah area, but on the residential side, this is one of the most consistent issues we find on early-failing asphalt roofs.
The way a properly ventilated attic works is straightforward. Cool outside air enters through intake vents at the soffits, travels up through the attic space, and exits through exhaust vents at or near the ridge. That continuous airflow keeps the attic from getting too hot in summer and removes moisture-laden air in winter. When that system is blocked or inadequate, two things go wrong. In summer, attic temperatures spike to levels that cook the asphalt shingles from underneath, breaking down the adhesive that holds the granules in place and causing the shingles to become brittle and curl well before their time. In winter, warm moist air from the living space rises into the attic and condenses on the cold roof deck. That moisture leads to mold, deck rot, and ice dam formation at the eaves that force water under the shingles during the next thaw.
What an Overheated Attic Does to Asphalt Roofing?
Asphalt shingles are built to handle outdoor temperatures, but not an attic running significantly hotter than the outside air. When ventilation is inadequate, attic temperatures on a hot Wisconsin summer day can climb well above ambient. The asphalt in the shingles softens repeatedly through the afternoon and rehardens overnight, which accelerates granule loss and causes the shingles to cup and curl ahead of schedule. Shingles installed over a poorly ventilated attic can lose years off their rated life compared to the same product installed over a well-ventilated space. When a homeowner wonders why their 30-year shingles looked worn out at year 16, overheating is often part of the answer.
What Wisconsin Winters Reveal About Attic Ventilation Problems?
Winter is when ventilation failures make themselves visible on Wisconsin homes. Ice dams form when heat from a poorly ventilated attic warms the roof deck enough to melt the snow above it. That meltwater runs down to the cold eave overhang and refreezes. As the cycle repeats, the dam grows and backs water up under the shingles. An asphalt roofing system is not designed to be the last line of defense against that kind of intrusion, and eventually it loses that battle. Ceiling staining near exterior walls is often the first sign ice dam water has found its way in. By that point the shingles, the underlayment, and sometimes the deck itself has already been damaged.
Protect Your Asphalt Roofing Investment
A new asphalt roof is only as good as the system supporting it, and that system includes what is happening in the attic. At Golden Eagle Roofing, we assess ventilation as part of every asphalt roofing inspection and installation in Tomah, Wisconsin, because getting it right from the start is what allows the shingles from CertainTeed, Malarkey, and Owens Corning to perform the way they were designed to perform. Call us at 608-633-6719 and let us take a look at the full picture before your next Wisconsin winter arrives.
FAQ
How do I know if my attic has enough ventilation for my asphalt roof?
A roofing contractor can assess ventilation during an inspection by checking the ratio of intake to exhaust venting against the attic’s square footage and comparing it to manufacturer requirements.
Can ventilation problems be fixed without replacing the whole asphalt roof?
In most cases yes. Adding soffit intake vents or improving ridge exhaust ventilation can be done independently of a full roof replacement.
Does Golden Eagle Roofing handle attic ventilation improvements along with roofing work?
Yes, Golden Eagle assesses and addresses ventilation as part of asphalt roofing installations.
Will poor ventilation void my shingle warranty in Wisconsin?
It can. Most major shingle manufacturers require ventilation to meet minimum standards for the warranty to remain valid, so this is worth verifying at installation time.