Roofing Glossary

Dark streaks or staining on roofs caused by Gloeocapsa magma, primarily a cosmetic issue common in humid climates.

The most common residential roofing material, made of fiberglass mat coated with asphalt and ceramic granules for weather protection.

A system of intake and exhaust vents that allows air circulation through the attic space, preventing heat and moisture buildup.

Bubble-like raised areas on shingles caused by trapped moisture or gases, potentially leading to premature shingle failure.

A vertical structure extending through the roof that requires specialized flashing systems to prevent water intrusion at the roof intersection.

Flashing installed over step flashing, typically embedded in masonry or attached to vertical surfaces to cover and protect the top edge of step flashing.

Fractures or splits in roofing materials caused by thermal stress, UV degradation, age, or impact, compromising the roof's weatherproofing ability.

Shingle deformation where edges turn upward (cupping) or corners turn up (clawing), typically caused by age, moisture, or poor ventilation.

A vertical pipe that carries rainwater from gutters down to ground level, directing water away from the building's foundation.

L-shaped metal flashing installed along roof edges to direct water away from the fascia and into the gutter system.

Using unmanned aerial vehicles equipped with cameras to assess roof conditions safely from above, especially for steep or inaccessible roofs.

The lower edge of the roof that overhangs the exterior wall, providing protection from water runoff.

The vertical board running along the roof edge where gutters are typically attached, covering the ends of roof rafters.

Metal or other waterproof material installed at roof intersections and penetrations to direct water away and prevent leaks.

The wearing away of protective ceramic granules from asphalt shingles, exposing the underlying asphalt to UV damage.

Channel installed along roof edges to collect and direct rainwater runoff away from the building's foundation.

Roof damage caused by hailstones, characterized by random circular impacts, bruised shingles, and dented metal components.

The external angle formed where two sloping roof planes meet, running from the ridge down to the eave, opposite of a valley.

Self-adhering membrane underlayment that provides superior protection in areas prone to ice dams and water pooling.

Ridge of ice that forms at roof edges in winter, preventing melted snow from draining and potentially causing water backup under shingles.

A composite organism of fungi and algae that forms crusty patches on roofs and embeds into shingle surfaces, causing granule loss when removed.

Durable roofing material made from steel, aluminum, copper, or zinc, known for longevity and energy efficiency.

An electronic device used to detect moisture levels in roofing materials and roof deck, helping identify hidden water damage.

Thick, green plant growth on roof surfaces that retains moisture and can work under shingles, causing damage to roofing materials over time.

Installing new roofing materials directly over existing shingles without removing them, a faster but sometimes limited option.

A rubber or neoprene flashing that seals around plumbing vent pipes where they penetrate the roof, preventing water intrusion.

The steepness of a roof expressed as a ratio of vertical rise to horizontal run, such as 6:12 (6 inches rise per 12 inches run).

A hole or penetration in roofing materials caused by foot traffic, falling objects, or animal activity, creating a direct path for water entry.

Sloping structural members that support the roof deck, running from the ridge to the wall plate and forming the roof's internal framework.

The sloped edge of a gabled roof that extends from the eave to the ridge, perpendicular to the eave edge.

The process of installing new roofing materials, either over existing materials (overlay) or after removing them (tear-off).

The horizontal line where two sloping roof planes meet at the highest point, typically covered with ridge cap shingles.

Specially designed shingles that cover the roof ridge, providing a finished appearance and protecting the vulnerable joint where two roof planes meet.

Ventilation system installed along the roof ridge that allows hot air to escape from the attic while preventing moisture intrusion.

The structural base layer of a roof, typically plywood or OSB, to which underlayment and roofing materials are attached.

A systematic evaluation of roof condition, documenting materials, age, damage, and potential issues for maintenance or insurance purposes.

A window installed in the roof plane that provides natural light, requiring proper flashing and sealing to prevent leaks.

The finished underside of the roof overhang, often containing vents that allow air intake for attic ventilation.

A low-pressure cleaning method using specialized chemical solutions to safely remove algae, moss, and stains from roofs without damaging shingles.

A unit of roof area measurement equal to 100 square feet, used to estimate materials and labor for roofing projects.

A metal roofing system featuring raised interlocking seams that run vertically up the roof slope, concealing fasteners for enhanced durability.

A specially designed strip of shingles or material installed along the eave edge to seal the first course of shingles and prevent wind uplift.

L-shaped pieces of flashing woven with shingle courses where the roof meets a vertical wall, creating a water-shedding transition.

Roof damage resulting from severe weather events including hail, high winds, heavy rain, lightning, or falling debris.

The process of completely removing existing roofing materials down to the deck before installing new roofing.

Camera technology that detects temperature variations to identify moisture intrusion, insulation gaps, and heat loss in roofing systems.

A water-resistant barrier installed between the roof deck and shingles, providing secondary protection against moisture infiltration.

The internal angle where two sloping roof planes meet, creating a channel that directs water runoff toward gutters.

Roof damage from high winds, typically showing as lifted, creased, or missing shingles along edges and ridges.