Understanding the language of residential roof replacement helps you make smarter decisions as a homeowner. Whether you’re reviewing contractor quotes, navigating an insurance claim, or planning a full roof replacement, this glossary breaks down the essential terms you need to know to protect your home and your investment.
Roof decking, also called sheathing, is the flat panel material — typically plywood or OSB — that forms the structural base of your roof. It sits on top of the rafters and provides the surface to which all other roofing materials are attached. Damaged or rotted decking discovered during a replacement must be repaired before new shingles are installed.
Underlayment is a water-resistant or waterproof layer installed directly on the roof decking beneath the shingles. It acts as a secondary barrier against moisture, wind-driven rain, and ice damage. Common types include felt paper and synthetic underlayment, with the latter offering superior durability and tear resistance.
Flashing consists of thin metal pieces — typically galvanized steel or aluminum — installed around roof penetrations like chimneys, skylights, and vents to prevent water from seeping into joints and seams. Improperly installed or deteriorated flashing is one of the most common causes of roof leaks. During a full replacement, flashing is often replaced or resealed to ensure a watertight fit.
Ice and water shield is a self-adhering waterproof membrane applied to vulnerable areas of the roof, such as eaves, valleys, and around penetrations. It protects against water infiltration caused by ice dams and wind-driven rain. Building codes in many regions require ice and water shield installation along roof edges, especially in climates prone to freezing temperatures.
A drip edge is a metal flashing installed along the edges of the roof to guide water away from the fascia and into the gutters. Without a properly installed drip edge, water can wick back under the roofing materials and cause wood rot or fascia damage. It is a critical component of a complete roof replacement system and is often required by local building codes.
A roof valley is the internal angle formed where two roof slopes meet, creating a channel that directs rainwater down toward the gutters. Valleys experience higher water flow than other roof areas, making proper sealing and flashing essential during replacement. Open and closed valley installations are two common methods, each offering different levels of water resistance and aesthetics.
Starter strip shingles are pre-cut shingles installed along the eaves and rakes before the first course of standard shingles. They provide an adhesive sealant layer that helps anchor the first row of shingles against wind uplift. Skipping the starter strip is a common shortcut that can void manufacturer warranties and leave your roof vulnerable to blow-offs during storms.
Roof pitch refers to the steepness or slope of a roof, expressed as a ratio of vertical rise to horizontal run — for example, 6:12 means the roof rises 6 inches for every 12 inches of horizontal distance. Pitch affects material selection, labor costs, and drainage performance. Steeper roofs generally shed water more effectively but require additional safety measures during installation.
With 20 years in the roofing industry, our team brings proven expertise and craftsmanship to every project — delivering reliable results you can count on without the guesswork.
Every roof installation includes a 10-Year Warranty, and every repair is backed by a 2-Year No Leak Warranty. We stand behind our work long after the job is complete.
We're proud to be Master Elite Certified by GAF, placing us among the top 3% of roofing contractors nationwide. That means rigorous training and the highest industry standards applied to your home.
We've earned the Home Advisor Service Award four years running and hold an A+ BBB rating — recognition built on real results and genuine customer satisfaction across Northern Georgia.
Now that you know the key terms, you’re better equipped to work with your contractor and make informed decisions. Reach out to Elite Roofing of Georgia today and take the first step toward a stronger, longer-lasting roof.
