Why Roofing Has Its Own Language (and Why It Matters to You)
The first time most homeowners look at a roofing estimate, it might as well be written in a foreign language. Squares. Drip edge. Ice and water shield. Rake. Starter strip. Hip and ridge. If you don't know what these words mean, you can't tell whether the quote is thorough, overpriced, or missing something it shouldn't be.
That's not a minor problem. Roofing is one of the biggest home expenses you'll face — often $10,000 to $20,000 or more in Northeast Wisconsin, depending on your home's size and the materials involved. You deserve to know what you're paying for.
This glossary covers the roofing terms you're most likely to encounter in Green Bay and the surrounding counties. No filler. No definitions that require three more definitions to understand. Just plain language, organized the way you'll actually use it.
The Roof Itself: Structural Terms
Decking (also: sheathing, roof deck) — The wood panel layer that forms the structural base of your roof. Usually OSB (oriented strand board) or plywood, nailed across the rafters. Everything else gets installed on top of it. When decking is soft, rotted, or delaminated from water damage, it needs to be replaced before any new materials go down. A contractor who doesn't inspect the deck before pricing a replacement is cutting a corner that can cost you later.
Rafters — The angled wooden framing members that give the roof its slope. They run from the ridge at the peak down to the eaves at the edge. In newer homes, prefabricated roof trusses often replace traditional cut rafters, but the function is the same.
Ridge — The highest horizontal line of the roof, where two opposing slopes meet at the peak. The ridge is covered with ridge cap shingles and often incorporates a ridge vent for attic ventilation.
Hip — A roof where all four sides slope downward to the eaves, meeting at a ridge. Hip roofs don't have vertical gable ends. They're common in older Wisconsin homes and tend to perform well in high-wind situations.
Gable — The triangular vertical wall section at the end of a roof with two sloping sides. A gable roof has one ridge at the top and two slopes. The triangular end wall beneath the peak is the gable.
Valley — Where two roof slopes meet and angle inward, forming a V-shape. Valleys channel a high volume of water, so they get special treatment: either open metal flashing or a woven/closed-cut shingle installation, all over ice and water shield.
Eave — The lowest edge of the roof that overhangs the exterior wall. The eave is where water exits the roof surface and enters the gutter. It's also where ice dams form in Wisconsin winters, which is why ice and water shield is always required here.
Rake — The sloped edge of a gable roof that runs from the eave up to the ridge along the gable end. Rakes get drip edge installed along them, just like eaves.
Soffit — The underside of the roof overhang, visible from ground level when you look up at the eave. Soffits typically contain intake vents that allow fresh air into the attic as part of the ventilation system.
Fascia — The vertical board that runs along the eave, closing off the end of the rafters. Gutters attach to the fascia. When fascia boards rot — which happens in Wisconsin from ice and water exposure — they need to be addressed before gutter reinstallation.
Square — A unit of measurement in roofing equal to 100 square feet of roof surface. When a contractor says "this is a 22-square roof," they mean the total surface area is 2,200 square feet. Quotes are often priced per square. If you want to understand how squares are calculated and why your quote shows more than your home's footprint, our post on what a roofing square means and how estimates are calculated breaks it down.
Pitch — The steepness of a roof, expressed as rise over run. A 6/12 pitch rises 6 inches for every 12 inches of horizontal distance. Steeper roofs cost more to work on — they require more safety equipment, slow the crew down, and use more material — and that legitimately shows up in estimates.
Roofing Materials: What Goes on the Roof
Shingles — The individual overlapping units that make up the outermost surface of most residential roofs. In Green Bay, asphalt shingles dominate because they're cost-effective, relatively easy to install, and available in a wide range of wind and impact ratings suited to Wisconsin weather. The two main types you'll see on estimates are three-tab and architectural.
Three-tab shingles — A thinner, flat style of asphalt shingle with cutouts along the bottom edge that create the appearance of three separate pieces. They're lighter and cheaper than architectural shingles but carry shorter warranties and offer less wind resistance. Honestly, most quality roofers have moved away from them for residential work.
Architectural shingles (also: laminate shingles, dimensional shingles) — A heavier, multi-layered asphalt shingle with a dimensional, textured appearance. More wind-resistant than three-tab, longer-lived, and most commonly specified for Wisconsin homes today. Standard warranties range from 30 to 50 years on the material, though workmanship warranty coverage varies by contractor.
Ice and water shield (also: ice and water barrier, peel-and-stick) — A self-adhering waterproof membrane installed directly on the decking before any underlayment or shingles. It's rubberized asphalt on the underside, which seals around nails and staples. Wisconsin code requires it along the eaves, but quality installations extend it into valleys and around all penetrations. It's one of the most important layers in a Wisconsin roof — and one of the easiest for a contractor to shortcut if they want to trim costs invisibly.
Underlayment (also: felt paper, tar paper, synthetic underlayment) — The layer of material installed over the decking and beneath the shingles. It acts as a secondary moisture barrier if water ever gets past the outer surface. Traditional felt underlayment (15 lb or 30 lb) has been used for a century and still works well. Synthetic underlayment is lighter, more tear-resistant during installation, and the current industry preference for most professional installs.
Starter strip — A specially designed row of shingle material installed at the eave before the first full course of shingles begins. It fills the gaps at the very edge of the roof and provides adhesive backing where the first shingle course sits. Some contractors substitute cut-up shingles to save a few dollars. It's not technically wrong, but purpose-made starter strips perform better, especially in wind.
Ridge cap shingles — Thicker, pre-bent shingles designed to cover and seal the ridge at the peak of the roof. They're installed in overlapping courses and handle weather exposure at the highest, most exposed point of the roof. Don't let anyone use standard field shingles bent over the ridge as a substitute.
Roof Components: The Pieces That Protect the Edges and Joints
Flashing — Sheet metal (typically aluminum, galvanized steel, or copper) shaped and installed at every junction where the continuous shingle surface is interrupted. Chimneys, skylights, dormers, walls, valleys, and vent pipes all require flashing. When flashing is done right, it's nearly invisible and outlasts the shingles around it. When it's done wrong — or when caulk is used in place of properly lapped metal — it's usually the first place a leak develops. Most roof leaks we diagnose in Green Bay start at the flashing, not the shingles themselves.
Step flashing — Individual L-shaped pieces of metal woven into the shingle courses along a vertical wall or dormer. Each piece overlaps the one below it, channeling water down and away from the wall. Replacing step flashing correctly requires removing shingles — which is why roofers who skip it hoping caulk will hold are setting you up for a problem within a few years.
Counter flashing — A second layer of flashing that overlaps the base flashing at a chimney, embedded into a mortar joint and bent down over the base flashing below. It's what prevents water from getting behind the base flashing. On older chimneys, counter flashing is often the first thing to fail as mortar joints deteriorate.
Drip edge — A formed metal strip installed along the eaves and rakes. Its job is to direct water off the roof edge cleanly, preventing it from running back along the fascia or wicking under the shingles at the edge. In Wisconsin's freeze-thaw climate, proper drip edge also plays a role in managing ice at the eave. It's inexpensive and non-negotiable on a quality installation.
Pipe boot (also: pipe flashing, pipe collar) — The rubber or metal fitting that seals around plumbing vent pipes where they penetrate the roof surface. Rubber boots eventually crack and shrink from UV exposure — typically after 10 to 15 years. A leaking pipe boot is a common and often overlooked source of water intrusion.
Valley flashing — Metal installed in the valley of the roof before shingles are laid. Open valleys have the metal visible as a channel between the shingle courses. Closed-cut and woven valleys have shingles running over the metal, concealing it. All three approaches work when properly installed; all three fail when the metal is undersized or the installation is rushed.
Ventilation: The Terms You'll Hear on Inspections
Attic ventilation — The system that moves air through the attic space, typically bringing cooler air in through soffit intakes and exhausting warm air out through ridge or box vents. Good ventilation prevents summer heat buildup (which ages shingles from below) and keeps the attic cold in winter (which prevents ice dam formation). In Wisconsin, ventilation problems are a direct cause of both ice dam damage and premature shingle failure. It comes up on almost every inspection we do in older homes across Brown and Outagamie counties.
Ridge vent — A continuous vented strip installed along the ridge of the roof, hidden beneath the ridge cap shingles. It allows warm attic air to exhaust evenly across the full length of the ridge. Ridge vents work best when paired with adequate soffit intake — without the intake, there's nothing driving airflow through the attic.
Soffit vent — Vents installed in the soffit panel to allow outside air into the attic at the eave. They're the intake side of the attic ventilation system. If they're blocked by insulation inside the attic, the whole ventilation equation breaks down.
Box vent (also: static vent, turtle vent) — Individual exhaust vents cut into the roof field rather than running continuously along the ridge. They work, but covering the same square footage of attic with box vents requires more of them than a continuous ridge vent system.
Power attic ventilator (also: attic fan) — An electrically powered fan mounted in the roof to force air out of the attic. They move more air volume than passive vents, but if the intake side isn't balanced, they can pull conditioned air from inside the house rather than hot air from the attic — which defeats the purpose and wastes energy.
Process and Contract Terms
Tear-off — The process of removing the existing shingles and underlayment before installing new materials. Most quality re-roofs include a full tear-off. Reroofing over existing shingles (called an overlay) saves labor but adds weight to the structure, prevents inspection of the decking, and typically voids manufacturer warranties. Wisconsin allows a maximum of two layers of shingles on a structure — but that doesn't mean two layers is a good idea.
Overlay (also: re-roof) — Installing new shingles directly on top of existing ones without tearing off. It's faster and cheaper upfront. It's also a shortcut that catches up with you. You can't see or address damaged decking, old flashing that's failing, or moisture trapped between layers. We cover the full comparison of roof replacement versus roof overlay in a separate post.
Workmanship warranty — A warranty from the contractor covering the quality of the installation itself, separate from the material warranty offered by the shingle manufacturer. Shingle warranties cover manufacturing defects; workmanship warranties cover how the materials were installed. If a roofer doesn't offer a workmanship warranty, ask yourself why. Pierce Roofing backs every installation with a 10-year workmanship warranty.
Material warranty — The manufacturer's guarantee on the shingles and other materials. Standard architectural shingles carry 30-year warranties; premium lines go to 50 years. Read the fine print — most material warranties are prorated, meaning the coverage decreases significantly after the first several years.
Atlas PRO+ Platinum certification — A designation from Atlas Roofing reserved for contractors who meet strict installation training requirements and minimum volume thresholds. Fewer than 1% of roofing contractors in the country hold this certification. It unlocks enhanced warranty options for homeowners — including coverage that's not available through non-certified installers. Michael Pierce holds this certification, which is one reason it's worth asking any contractor you talk to about their manufacturer relationships.
A Few More You Might Encounter
Granules — The mineral particles embedded in the surface of asphalt shingles that provide UV protection, color, and impact resistance. Finding granules in your gutters is a sign that shingles are losing their surface coating — a normal occurrence as shingles age, but accelerated granule loss is a sign of damage or premature wear.
Algae resistance (also: AR shingles) — Asphalt shingles that incorporate copper or zinc granules to inhibit the blue-green algae that causes the dark streaking you see on roofs in humid climates. In Northeast Wisconsin's wet springs and falls, algae-resistant shingles are worth specifying.
Deck nailing — How the decking panels are fastened to the rafters. Proper fastening patterns matter more than most homeowners realize — under-fastened decking can deflect and move, which eventually damages the roofing above it.
Field — The main body of the roof surface, as opposed to the edges, valleys, and penetrations. "Field shingles" refers to the standard shingles installed across the majority of the roof area.
Use This Glossary Before Your Next Estimate
Knowing the vocabulary doesn't make you a roofer. But it does make you a harder person to shortcut. When you can read an estimate line by line and ask specifically about ice and water shield coverage, the brand of underlayment being used, or how flashing at your chimney will be handled, you're having a different conversation than the homeowner who nods along and picks based on the bottom number.
If you want to go deeper on any of these, our FAQ page answers the questions homeowners most commonly ask us before a project starts. Our process overview explains how Pierce Roofing approaches each stage of an installation. And if you're getting close to making a decision on materials, our roofing types guide compares the options available for Wisconsin homes.
When you're ready to talk about your specific roof, we're straightforward about what we find and what we recommend. No pressure, no upselling you on things you don't need.
Pierce Roofing serves homeowners across Brown, Kewaunee, Oconto, Outagamie, Winnebago, and Manitowoc counties. Michael Pierce has 30 years in the trades, holds Atlas PRO+ Platinum certification, and carries $2 million in liability coverage.
Call us at (920) 609-8304 or request a free estimate online. We'll tell you exactly what your roof needs — and exactly what it doesn't.