A Homeowner’s Guide to Common Roofing Terms

Roofing professionals often use technical terms that can be confusing if you’re not familiar with roofing systems. This glossary explains many of the most common roofing terms in plain language to help homeowners better understand inspections, estimates, repairs, and roof replacements.

A

Architectural Shingles

A type of asphalt shingle with a layered, dimensional appearance. Architectural shingles are commonly used on residential homes and are available in many colors and styles.

Attic Ventilation

The movement of air through an attic using intake and exhaust vents to help regulate heat and moisture.

Algae Staining

Dark streaks or discoloration that can develop on certain roofing materials due to airborne algae, especially in warm, humid climates like Florida.

Apron Flashing

Flashing installed where a sloped roof meets a vertical wall or chimney to help direct water away from the connection.

B

Base Sheet

A layer used in certain low-slope and roofing membrane systems as part of the complete roof assembly.

Battens

Wood or metal strips used in some roofing systems to support or attach roofing materials, especially tile and certain metal roofs.

Boot Flashing

Another name for a pipe flashing that seals around plumbing vent pipes.

Built-Up Roof (BUR)

A low-slope roofing system made from multiple layers of asphalt and reinforcing materials, often finished with gravel or a protective coating.

C

Cap Sheet

The top layer of many modified bitumen roofing systems that provides weather protection.

Counter Flashing

Flashing installed over base flashing to help direct water away from roof-to-wall intersections and other transitions.

Chimney Cricket

A small, peaked structure installed behind a chimney to divert water around it and reduce water buildup.

Closed Valley

A roof valley where roofing materials cover the valley flashing instead of exposing the metal.

Coating

A protective material applied to certain roofing systems to help improve weather resistance and extend the life of the roof.

Concrete Roof Tile

A roofing material manufactured from concrete and designed to resemble traditional clay tile or other architectural styles.

Coping

Protective metal or masonry installed on the top of parapet walls to help prevent water intrusion.

D

Decking (Roof Deck)

The structural surface attached to the roof framing that supports the roofing system.

Drip Edge

A metal flashing installed along roof edges to help direct water away from the fascia and roof deck.

Deck Fasteners

Nails or screws used to secure roof decking to the structural framing.

Dormer

A roofed structure projecting from the main roof, usually containing a window.

Downspout

A vertical pipe that carries water from the gutter to the ground or drainage system.

E

Eave

The lower edge of a roof that extends beyond the exterior wall.

Expansion Joint

A designed joint that allows sections of a roof or building to expand and contract with temperature changes.

Exhaust Vent

A roof vent that allows warm, moist attic air to escape.

F

Fascia

The board attached to the ends of the roof rafters where gutters are commonly installed.

Flashing

Metal or other approved materials installed around roof penetrations, walls, chimneys, valleys, and other vulnerable areas to help direct water away from the structure.

Fasteners

Nails, screws, clips, or other approved products used to secure roofing materials.

Felt Underlayment

A traditional asphalt-saturated underlayment used beneath certain roofing materials.

G

Granules

Protective mineral particles applied to asphalt shingles to help shield them from sunlight and weather.

Gutters

Channels installed along roof edges to collect and direct rainwater away from the home.

Gable

The triangular wall section located beneath the two sloping sides of a gable roof.

Gable Roof

A roof with two sloping sides that meet at a ridge.

Galvanized Steel

Steel coated with zinc to improve resistance to corrosion.

H

Hip Roof

A roof with slopes on all sides that meet at the ridge or hips.

Headwall Flashing

Flashing installed where the upper portion of a roof meets a vertical wall.

Hip

The outside angle formed where two roof slopes meet.

Hip Cap

Special roofing materials installed over roof hips to provide protection and a finished appearance.

I

Ice and Water Barrier

A waterproof membrane used in certain roofing applications to provide additional moisture protection in vulnerable areas.

Intake Vent

A vent, often located in the soffit, that allows fresh outside air into the attic.

J

Jack Rafter

A shorter rafter used in roof framing that connects to a hip or valley.

L

L Flashing

An L-shaped metal flashing commonly used where roofing materials meet walls or other roof transitions.

Low-Slope Roof

A roof with a slight pitch that requires roofing materials designed for low-slope applications.

Laminated Shingles

Another name for architectural asphalt shingles featuring multiple layers for added dimension.

Lap

The overlap between roofing materials or flashing designed to help shed water.

M

Metal Roofing

A roofing system made from steel, aluminum, copper, or other metals designed to protect residential or commercial buildings.

Modified Bitumen

A roofing membrane commonly used on low-slope and flat roofing systems.

Mechanical Fastening

A method of securing roofing materials using approved fasteners rather than adhesives.

Moisture Barrier

A material used to help reduce moisture movement through parts of a roofing system.

N

Nail Line

The designated area on a roofing material where fasteners should be installed according to manufacturer instructions.

Nail Pop

A roofing nail that has partially backed out, which may affect roofing performance.

O

Overlay

Installing a new layer of roofing material over an existing roof where permitted and appropriate. Local building requirements and roof conditions determine whether this is allowed.

Open Valley

A roof valley where metal flashing remains visible to help direct water.

P

Pipe Flashing

A flashing designed to seal around plumbing vent pipes where they pass through the roof.

Ponding Water

Water that remains on a low-slope roof for an extended period instead of draining properly.

Parapet Wall

A wall extending above the edge of a roof, commonly found on commercial and flat-roof buildings.

Penetration

Any object passing through the roof, such as plumbing vents, skylights, chimneys, or HVAC equipment.

Plywood

Wood panels commonly used as roof decking on residential homes.

R

Ridge

The highest point where two roof slopes meet.

Ridge Vent

A ventilation product installed along the roof ridge to allow warm attic air to escape.

Roof Pitch

The slope or steepness of a roof, commonly expressed as a ratio such as 4:12 or 6:12.

Rafter

A structural framing member that supports the roof deck.

Roof Coating

A protective coating applied to certain roofing systems to help improve weather resistance and extend service life.

Roof Deck Attachment

The method used to secure roof decking to the framing, an important consideration for wind resistance.

Roof Jack

A flashing installed around pipes or roof penetrations to help prevent water intrusion.

Roof Valley

The area where two roof slopes meet and channel rainwater.

S

Soffit

The finished underside of a roof overhang that often contains intake ventilation openings.

Starter Shingles

The first row of shingles installed along roof edges to help begin the roofing system.

Secondary Water Resistance

An additional protective layer beneath the roof covering that may help reduce water intrusion if the primary roof covering is damaged.

Skylight

A window installed in the roof to allow natural light into the home.

Scupper

An opening that allows water to drain from a flat roof through a parapet wall.

Sealant

A roofing material used around approved roofing details to help reduce water intrusion.

Self-Adhered Underlayment

An underlayment with an adhesive backing designed to bond directly to the roof deck.

Sheathing

Panels installed over roof framing that form the roof deck.

Slope

The angle or pitch of a roof.

Starter Strip

A specially designed roofing product installed at roof edges before the first course of shingles.

Standing Seam Metal Roof

A metal roofing system with raised seams designed to conceal fasteners and provide a clean appearance.

T

Tile Roofing

A roofing system made from concrete or clay tiles installed over an approved underlayment system.

Torch-Applied Roofing

A modified bitumen roofing system installed using heat to bond roofing membranes.

Transition Flashing

Flashing installed where two different roof planes or roofing materials meet.

U

UV Resistance

The ability of a roofing material to resist deterioration caused by ultraviolet sunlight.

Underlayment

A protective layer installed between the roof deck and the finished roofing material.

V

Valley

The area where two roof slopes meet and channel rainwater toward the roof’s drainage system.

Vent Pipe

A plumbing pipe that extends through the roof and requires proper flashing to help prevent water intrusion.

Valley Flashing

Metal flashing installed in roof valleys to help direct water safely off the roof.

Vapor Barrier

A material designed to reduce the movement of moisture vapor through building assemblies.

W

Warranty

A written agreement describing the coverage provided by the manufacturer and/or roofing contractor. Coverage varies depending on the roofing products and installation.

Wind Mitigation

An inspection that evaluates certain construction features of a home that may improve resistance to wind damage.

Wall Flashing

Flashing installed where a roof meets a vertical wall to help prevent water intrusion.

Water Shedding

The process of directing rainwater away from the roofing system.

Weep Hole

A small opening designed to allow trapped moisture to drain from certain roofing assemblies.

Wind Uplift

The upward pressure created by strong winds that can affect roofing materials and attachments.

Workmanship Warranty

A warranty provided by the roofing contractor covering the quality of the installation, separate from any manufacturer warranty.

Z

Zinc Strip

A strip of zinc installed near the ridge of some roofs to help reduce algae and moss growth as rainwater washes over the roof surface.

Why Learning Roofing Terms Matters

Understanding common roofing terminology can help homeowners:

• Better understand roofing estimates

• Communicate more effectively with contractors

• Compare roofing systems

• Make informed decisions about repairs and replacements

• Understand inspection reports

The more you know about your roof, the more confident you’ll be when making important home improvement decisions.

Disclaimer

This glossary is provided for educational purposes only. Roofing terminology, installation methods, and building requirements may vary depending on the roofing system, manufacturer specifications, and applicable codes.