Roofing Terms

A square vent that releases hot air and moisture from the attic, helping maintain a cool, dry roof system.

Also called flashing cement or mastic, this asphalt-based adhesive bonds roofing materials and seals gaps to prevent water intrusion.

A vertical structure that vents smoke and gases from fireplaces or furnaces. Because it penetrates the roof surface, it must be properly flashed to avoid leaks.

A protective metal barrier sealing the intersection between the chimney and roof to prevent water infiltration.

A durable shingle type designed to withstand moderate hail and storm impact.

The highest impact-resistance rating for asphalt shingles, offering superior protection from hail, wind, and debris — sometimes eligible for insurance discounts.

A thin strip of metal flashing installed along roof edges to guide rainwater into gutters and protect the fascia.

A window structure projecting vertically from a sloped roof, often used to add space, light, and architectural interest.

The lower edge of the roof extending beyond the home’s exterior walls, protecting siding and the foundation from water runoff.

The horizontal board along the roof edge where gutters attach, covering the rafter ends and giving the roof a finished appearance.

A waterproof material, usually metal, installed around roof openings such as chimneys, vents, and valleys to prevent leaks.

The triangular section of wall beneath the peak of a dual-sloped roof.

A channel system along the eaves that collects and redirects rainwater away from the foundation.

A roof with four sloping sides and no vertical ends, valued for its wind resistance — a popular design across Mid-Missouri.

A self-adhesive waterproof membrane applied under shingles to prevent leaks from ice dams and wind-driven rain.

The angle or steepness of a roof, expressed as a ratio such as 6:12.

A rubber or metal flashing that seals around plumbing vent pipes to stop water from entering.

The sloped structural beams that support the roof’s shape and weight.

The horizontal line where two roof slopes meet at the highest point.

A continuous vent installed along the ridge to allow hot attic air to escape.

A measurement equal to 100 square feet, used to estimate material quantities and labor.

The wooden surface, typically plywood or OSB, attached to the roof framing that supports underlayment and shingles.

The finished underside of the eaves that provides ventilation to the attic space.

The first row of shingles installed along the roof edge to seal the field shingles and protect against wind and water.

A narrow material layer placed beneath starter shingles to reinforce eaves and rake edges against water infiltration.

A protective, moisture-resistant layer between the roof decking and shingles.

Two roof slopes meet with exposed metal flashing visible in the valley, helping water drain quickly.

Shingles from both slopes weave together across the valley to create a continuous, water-shedding design.

Premium asphalt shingles that replicate the look of slate or wood shakes while offering advanced weather protection.

Designed to handle hail and storm damage, these shingles may qualify for insurance premium reductions due to their durability rating.

Reflective shingles that minimize heat absorption, reduce attic temperatures, and improve energy efficiency during warm Missouri seasons.

Roofing made from cedar, redwood, or pine, offering a warm, rustic style and natural insulation.

Similar to wood shingles but thicker and rougher-cut for a handcrafted look.

A strong, low-maintenance, energy-efficient roofing option made from steel, aluminum, or copper — ideal for Mid-Missouri’s changing weather conditions.