"Most roofers don't even talk about ventilation — they just install the roof and walk away. We start with it. Proper attic airflow and the right components are the difference between a roof that lasts 10 years and one that lasts 30."
Here's the thing most roofers won't tell you: a roof is a system, not just a layer of shingles. The shingles you see from the street are only as good as the attic ventilation beneath them and the components — flashings, underlayment, and pipe boots — that tie the whole thing together. Get those details right and a roof lasts for decades. Get them wrong, and even premium shingles will fail early, leak, and void their own warranty.
This is the part of roofing that separates Thomsen from the low-bid crowd. Most contractors don't even mention ventilation — they nail down a new roof and move on. We start every job with a full attic ventilation assessment, because most manufacturers will not honor their shingle warranties if the attic isn't properly vented. A poorly ventilated attic traps heat and moisture, cooks shingles from below, drives up your energy bills, and dramatically increases the risk of ice dams in our Colorado winters.
The "components" side matters just as much. On every roof we install, we replace all flashings, underlayment, and pipe boots — we never reuse them. These are the exact parts that fail first and cause the leaks that low-bid roofers leave behind. Owner Scot Thomsen has been roofing the Front Range since 1985, and this attention to the system — not just the surface — is a big part of why more than 90% of our business comes from referrals.
The details that don't show up in a low-bid quote — but are exactly what determine how long your roof actually lasts.
Every job starts with an evaluation of your attic's intake and exhaust, so we can recommend the balanced airflow system your home actually needs.
Ridge vents, soffit/intake vents, and balanced airflow that let hot, moist air escape and fresh air in — the foundation of a healthy attic and a long-lasting roof.
Proper ventilation keeps the roof deck cold and even in winter, reducing the snowmelt-and-refreeze cycle that creates the ice dams plaguing Front Range homes.
Flashing around chimneys, walls, valleys, and skylights directs water off your roof. We replace it — never reuse old flashing — because it's a top source of leaks.
The water-resistant layer beneath your shingles is your roof's last line of defense. We install fresh, quality underlayment on every replacement — no shortcuts.
The rubber seals around plumbing vents dry out and crack in Colorado's sun and are a classic leak point. We replace every pipe boot — we never patch over them.
Attic ventilation isn't a sales add-on — it's building science. A balanced system that brings cool air in low and lets hot, moist air out high protects your roof, your home, and your wallet in ways most homeowners never realize until something goes wrong.
Proper attic ventilation delivers:
This is the detail that costs homeowners the most — and the one most roofers stay quiet about. The majority of shingle manufacturers require proper attic ventilation as a condition of their warranty. Install a brand-new roof over a poorly vented attic, and you can void the very warranty you paid for — while heat and trapped moisture quietly destroy your new shingles from below.
Thomsen does it differently. We assess ventilation on every job, recommend the right balanced system, and replace all the components — flashings, underlayment, pipe boots — that keep water out and the warranty intact. It's the kind of work that doesn't show up in a cheap quote, but it's exactly what makes a roof last and stay protected.
Part of every Thomsen roof — assessed, recommended, and installed the right way.
We assess your attic's intake, exhaust, insulation, and moisture conditions.
We recommend the right balanced ventilation system for your specific home.
We identify all flashings, underlayment, and pipe boots that need replacing.
We install vents and new components correctly, to manufacturer standards.
Your shingle warranty stays valid and your roof system performs as designed.
Because a roof is a system, not just shingles. Proper ventilation keeps heat and moisture from building up in your attic — which protects your shingles from cooking out early, keeps your manufacturer warranty valid, lowers energy bills, and reduces ice dams in winter. It's often the single biggest factor in whether a roof lasts 10 years or 30. Most roofers skip it; we start every job with it.
Yes — and this surprises a lot of homeowners. Most shingle manufacturers require proper attic ventilation as a condition of their warranty. If your attic isn't adequately vented, a warranty claim can be denied, leaving you on the hook for a roof that failed early. We make sure your ventilation meets requirements so the warranty you paid for actually protects you.
A balanced system has roughly equal intake (low, at the soffits/eaves) and exhaust (high, at the ridge). Cool air enters low, picks up heat and moisture, and exits high — a natural, continuous flow. Too much of one without the other doesn't work properly. During your assessment we calculate what your attic needs and recommend the right combination of ridge vents, intake vents, and airflow.
Ice dams form when heat escaping into the attic melts snow on the upper roof, which then refreezes at the cold eaves and backs water up under the shingles. Proper ventilation keeps the roof deck cold and even, dramatically reducing that melt-and-refreeze cycle. It's one of the best defenses against the winter leaks Front Range homeowners deal with. See our Roof Repairs page if you've already had ice-dam damage.
Because they're the parts that fail first and cause the most leaks. Reusing old, brittle flashing or a cracked pipe boot to save a few dollars is a classic low-bid shortcut — and it's exactly why those roofs start leaking around the details a year or two later. On every Thomsen roof, all flashings, underlayment, and pipe boots are new. No exceptions, no shortcuts.
Yes — a full attic ventilation assessment is standard on every Thomsen roof replacement, along with new flashings, underlayment, and pipe boots. It's not an upsell or an add-on line item; it's simply part of how we build a roof correctly. If you have an existing roof with ventilation concerns, we can assess and improve it as a standalone job too.
Free estimates • Ventilation on every job • GAF Certified • Workmanship Warranty • Serving Boulder Since 1985
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