Roofing Glossary — Roof Quotes Near Me

A

Actual Cash Value (ACV): How some insurance policies pay out for an older roof: replacement cost minus depreciation for wear and tear. An ACV settlement on a 20-year-old roof can be a fraction of what replacement actually costs, which is why many homeowners pay extra for RCV (Replacement Cost Value) coverage instead.
Adjuster: The insurance company representative who inspects your roof after a storm and decides what the policy will pay. Their written estimate sets the claim amount. You can request a re-inspection if you believe damage was missed, and in many states you can hire a public adjuster to represent you.
Algae streaking: The dark, greenish-black streaks that appear on shingle roofs in humid climates, caused by Gloeocapsa magma algae. Cosmetic rather than structural, but it ages a roof visually before the shingles actually wear out. A zinc or copper strip at the ridge discourages regrowth.
Architectural shingle: Also called dimensional or laminated shingles. Thicker than traditional 3-tab shingles, with a layered, shadowed look. The most common residential asphalt choice today because they last 20–30 years and hide imperfect decking better than 3-tabs do.
Asphalt shingle: The material covering roughly 75% of US homes. Made from a fiberglass mat coated in asphalt and topped with ceramic granules. Comes in two main grades: 3-tab (budget) and architectural (standard). Typical lifespan 20–30 years depending on grade and climate.

B

Blistering: Small raised bubbles on the shingle surface, caused by trapped moisture or gas beneath the shingle heating up from below. Not a leak by itself, but usually a sign of attic ventilation problems that will shorten the roof's life if not addressed.
Built-up roofing (BUR): A flat-roof system of alternating layers ("plies") of asphalt and reinforcing fabric, topped with gravel. Older technology still found on many commercial and mid-century residential low-slope roofs. Generally being replaced by TPO or EPDM on new jobs because those membranes install faster.

C

Certificate of insurance (COI): The document a contractor's insurer issues showing they carry current general liability and workers' compensation coverage. Always request a current COI before work starts — an expired one protects nobody. You can call the issuing insurer to verify it's still active.
Change order: A written agreement modifying the scope or price of the original contract. If your roofer finds rotted decking they didn't plan for, the extra work and cost should be documented in a change order you sign before it's done — not added to the final invoice by surprise.
Clay tile: Fired-clay roof tiles, classically associated with Mediterranean and Spanish architecture. Last 50+ years, fireproof, and distinctive-looking, but heavy enough to require reinforced framing in most homes. Popular in hot, dry climates where freeze-thaw cycling isn't a concern.
Concrete tile: Cement-based tiles that mimic the look of clay or slate at a lower cost. Lifespan of 40–50 years, similarly heavy to clay tile and also requiring framing to match. Quality varies by manufacturer — look for ones with long color-fastness warranties.
Cupping: When shingle corners curl upward, leaving the shingle concave. Usually a sign of end-of-life or of poor attic ventilation cooking the shingles from below. Once cupping is widespread, the roof is past the point where sealing individual shingles makes sense.
Curling: When shingle edges curl up or down along their length. Distinct from cupping (which affects the corners). A common end-of-life signal on asphalt roofs 15+ years old; widely curled shingles no longer shed water reliably and are approaching failure.

D

Deck (roof deck): Also called sheathing. The plywood or OSB panels nailed to the rafters that form the structural base of the roof. Everything else — underlayment, shingles, flashing — attaches to the deck. Rotted deck must be cut out and replaced during any roof replacement.
Dormer: A vertical window that projects from the sloping roof surface, with its own small roof above the opening. Dormers add headroom and daylight to upper rooms but also add flashing seams where roof meets dormer wall — which are among the more leak-prone spots on any roof if installed carelessly.
Drip edge: L-shaped metal flashing nailed along eaves and rakes that directs water away from the fascia and into the gutter. Required by most modern building codes. Skipping drip edge is a classic sign of a cut-corners installation — and a common cause of fascia and soffit rot a few years later.

E

EPDM: Ethylene propylene diene monomer — a black rubber membrane used on flat or low-slope roofs. Long-lasting (20–30 years) and cost-effective to install, but the dark color absorbs heat, which can raise cooling bills compared to a white TPO membrane.
Eave: The lower, overhanging edge of the roof where the gutters attach. The eave is where ice dams form and where most water-backup problems start, which is why ice-and-water shield is required at eaves in cold climates.
Exposure: The visible portion of a shingle after installation, with the rest covered by the course above. Standard architectural-shingle exposure is about 5 5/8 inches. Exposure determines how many overlapping layers of protection the roof has — stretching it past spec saves material but weakens waterproofing.

F

Fascia: The vertical trim board running along the roof edge where the gutters attach. Exposed to weather and prone to rot if water gets behind it. Fascia is often painted or replaced during a roof job — ask whether it's included in your quote or priced separately.
Flashing: Thin metal sheets used to seal joints where the roof meets walls, chimneys, valleys, skylights, and any other penetration. Most roof leaks are actually flashing failures, not shingle failures — which is why flashing quality separates a 20-year installation from a 10-year one.

G

Gable: The triangular wall section at the end of a pitched roof. A "gable roof" has two sloping sides that meet at a single ridge, leaving exposed gable-end walls. Gable roofs are simpler and cheaper to build than hip roofs but less wind-resistant in high-wind regions.
Granule loss: When the ceramic granules coating asphalt shingles wear or wash off. Small amounts collecting in the gutter are normal; heavy loss after a storm can indicate hail damage, and bare spots mean the fiberglass mat is now UV-exposed and will fail fast. Granule loss is one of the clearest visual signs a roof is reaching end-of-life.

H

Hail bruising: Soft spots on asphalt shingles where hail has compressed the mat and knocked granules loose, even without making a visible hole. Adjusters look for bruising by touch as much as by sight — a bruised shingle will feel spongy compared to an intact one nearby.
Hip: The external angle where two sloping roof surfaces meet. A "hip roof" slopes on all four sides instead of having gable ends. Hip roofs perform better in high winds but are more expensive to roof because of the extra cuts and ridge caps required at every hip line.

I

Ice dam: A ridge of ice that forms at the eave when snow on a warm upper roof melts, runs down, and refreezes at the cold eave. The dam traps meltwater, which then backs up under the shingles. A leading cause of interior water damage in winter; ice-and-water shield and proper attic insulation are the main preventions.
Ice-and-water shield: A self-adhesive rubberized membrane installed along eaves, valleys, and around roof penetrations. Specifically designed to prevent ice-dam leaks from backing water under shingles. Required by code at eaves in most cold climates (typically the first 2 feet up from the heated wall).
Impact-resistant shingle (Class 4): An asphalt shingle rated UL 2218 Class 4 — the highest impact classification. Resists hail damage significantly better than standard shingles. Many insurance carriers offer a 5–25% premium discount for Class 4 shingles in hail-prone states, often covering the cost difference within a few years.
International Residential Code (IRC): The model building code adopted, with state amendments, across most US jurisdictions. Chapter 9 governs roofing: deck thickness, underlayment requirements, flashing, and ventilation minimums. Your local building inspector enforces the IRC version your jurisdiction has adopted, which can lag the current edition by several years.

L

Lien waiver: A document your contractor — and any subs or material suppliers they used — signs acknowledging they've been paid. Collecting signed lien waivers before final payment protects you from mechanic's liens if a sub isn't paid by the GC. Standard practice on any job over a few thousand dollars.

M

Metal roofing (standing seam): A premium metal roofing style where panel edges are raised and folded together to form a vertical, sealed seam. No exposed fasteners. Lifespan of 40–70 years, excellent in snowy or coastal climates. Significantly more expensive than asphalt but often the last roof a home will ever need.
Moss: Thick green plant growth that holds moisture against the roof deck, accelerating shingle breakdown. Most common on shaded, humid-climate roofs. Treat early with a zinc strip at the ridge, or do a targeted chemical cleaning — do not pressure-wash shingles, which strips granules.

N

Natural slate: Quarried stone tiles, historically the premium roofing material. Lifespan of 75–150+ years, visually distinctive, and fireproof. Very heavy (often requiring a structural engineer's review), very expensive, and genuinely skilled installers are scarce. Most common on historic homes and high-end custom builds.

O

Overlay (roof-over): Installing new shingles directly over the existing ones instead of tearing off. Allowed once by code in most jurisdictions if the existing roof is sound and flat. Cheaper short-term but shortens the new roof's life, traps any hidden deck damage beneath, and complicates future replacement.

P

Penetration: Anything that interrupts the roof surface: pipes, vents, chimneys, skylights, satellite mounts. Every penetration needs flashing and is a potential leak point, which is why complex roofs (with many penetrations) cost more to replace per square than simple ones.
Pitch (slope): The steepness of a roof, expressed as rise over run (e.g., 6:12 means 6 inches of rise per 12 inches of horizontal run). Low-slope roofs (below 4:12) need different materials than steeper roofs. Pitch also affects labor cost — steeper is slower and requires more fall protection.
Policy deductible: The amount you pay out-of-pocket before insurance pays on a roof claim. Common deductibles are a flat $1,000–$2,500 or 1–2% of your dwelling coverage limit. On a $15,000 claim with a $3,000 deductible, insurance pays $12,000 and you pay the rest.
Ponding water: Water that doesn't drain within 48 hours of rain on a flat or low-slope roof. A sign of inadequate slope or a blocked drain. Ponding accelerates membrane breakdown and is a warranty-voiding condition on most flat-roof systems.
Pro-rated warranty: A manufacturer warranty that pays less as the roof ages. A "50-year" pro-rated warranty might cover 100% of materials for the first 10 years, then drop in steps to 20% by year 30. Read the fine print — long warranty numbers rarely translate to equivalent dollar value.

R

Rake: The sloped edge of a gable roof, running from the eave up to the ridge. Rake trim and drip-edge metal cover this edge. Rake edges catch a lot of wind, which is why starter strip and proper nailing matter especially here.
Replacement Cost Value (RCV): How insurance pays on a policy with full replacement coverage: the actual cost to replace the damaged roof, without depreciation for age. Typically paid in two installments — one at approval and a second after the completed work is verified. Worth the extra premium on an older roof.
Ridge: The highest horizontal line of a roof where two slopes meet. Ridge caps — special bent shingles — cover this seam and usually hide a continuous ridge vent underneath. A clean, uniform ridge line is one of the first things to look at when judging installation quality from the ground.
Ridge vent: A slotted vent running along the roof ridge that allows hot attic air to escape. Paired with soffit vents at the eaves, it creates the balanced airflow that keeps an attic dry and cool. Modern installations use continuous ridge vents hidden under the ridge caps.
Rotted decking: Plywood or OSB sheathing that has absorbed enough moisture (usually from prior leaks) to become soft or structurally compromised. Must be cut out and replaced during a roof job. Usually priced per sheet — $50–$100 is typical. Ask your contractor to show you any sheets they plan to charge for.

S

Scope of work: The detailed list of exactly what the contractor will do — tear off, replace underlayment, install shingles, flash chimneys, haul debris — spelled out in the contract. A vague scope ("replace the roof") invites change-order surprises. A detailed one protects both sides.
Shingle course: A single horizontal row of shingles across the roof. Each course overlaps the one below it to shed water downward. The very first course — called the starter course — uses a different product (starter strip) that has the sealant on the bottom edge instead of the top.
Skylight: A fixed or venting window in the roof. Modern skylights last 20+ years when flashed correctly, but older skylights with failed seals are a common hidden leak source. Plan to replace any skylight older than 20 years during a full roof replacement — labor to reinstall a new one is minor if the roof is already open.
Soffit: The underside of the roof overhang at the eaves, usually with vents built in. Paired with a ridge vent to create attic airflow. Most modern soffits are vinyl or aluminum panels, which resist rot better than the painted-wood soffits common on older homes.
Soffit vent: Intake vents built into the soffit that draw cool air into the attic. The essential counterpart to a ridge vent or gable vent — without intake at the eaves, exhaust at the top can't work. Blocked or painted-over soffit vents are a leading cause of attic moisture problems.
Square (roofing): A unit of roof measurement: one square equals 100 square feet. Contractors quote in squares because that's how shingles are bundled — three standard bundles of architectural shingles typically cover one square. A 2,000 sq ft roof is 20 squares.
Starter strip: A narrow first course of pre-sealed shingles installed along the eaves and rakes before the field shingles go on. Improves wind resistance at the edges, where uplift forces are strongest. Skipping starter strip (or using cut-up 3-tabs instead) is a corner-cutting habit that shortens roof life.
Step flashing: Small rectangular pieces of flashing interwoven with shingles where the roof meets a sidewall (like a dormer or chimney). Each piece "steps" down one shingle course at a time, so water hitting the wall can't find a continuous seam. Done correctly, step flashing is the most reliable sidewall waterproofing method.
Synthetic slate: Composite roofing made from recycled polymers to mimic natural slate's appearance at a fraction of the weight and cost. Lifespan of 40–50 years. A reasonable alternative when structural framing can't support real slate — and often approved where HOAs require a slate look.

T

TPO: Thermoplastic polyolefin — a white single-ply membrane used on flat or low-slope roofs. The reflective surface cuts summer cooling bills significantly. Seams are heat-welded for a continuous waterproof surface. Typical 20–25 year lifespan and among the most common flat-roof choices on modern residential buildings.
Tear-off: The process of removing the existing roof down to the deck before new roofing is installed. Preferred over overlay because it exposes the deck for inspection and gives the new roof a clean surface. Standard practice on any quality installation.
Thermal cracking: Hairline cracks in asphalt shingles caused by repeated daily heating and cooling over years. A normal end-of-life signal on 18+ year old roofs. Becomes a leak problem once the cracks penetrate the mat all the way through to the underlayment.
Three-tab shingle: The older, budget-tier asphalt shingle style with a flat, uniform strip-and-cutout pattern. Cheaper than architectural shingles but shorter-lived (15–20 years) and less wind-resistant. Still common on rentals, budget new builds, and insurance-mandated like-for-like replacements.
Transferable warranty: A manufacturer warranty that stays valid when the home is sold, usually with a one-time transfer fee and written registration. A transferable warranty can add real resale value to a newer roof. Non-transferable warranties simply end at sale, which is worth knowing before choosing a brand.

U

UL fire rating (Class A/B/C): Underwriters Laboratories' fire rating for roofing assemblies. Class A is the highest — resists severe fire exposure, typical of most asphalt shingles and tile roofs. Class C is the lowest code-compliant rating. Many insurers require Class A in wildfire-prone zones, and some offer premium discounts for it.
Underlayment: The waterproof layer installed on the roof deck before shingles go on. Traditionally asphalt-saturated felt ("tar paper"); modern installations use synthetic underlayment, which is lighter, stronger, and longer-lasting. Required by code on all sloped roofs and a critical second line of defense when shingles fail.

V

Valley flashing: Metal flashing installed in roof valleys, where two slopes meet and water volume is highest. Comes in open-V or W-profile shapes. Valleys are among the most leak-prone areas on any roof; done right, valley flashing is invisible for decades. Done wrong, it's often the first place to fail.

W

Wind rating: The maximum wind speed a shingle is rated to resist before blowing off. Modern asphalt shingles come in 110, 130, and 150 mph ratings. The minimum required varies by region — coastal Florida and other hurricane-exposed counties typically require 130+ mph rated shingles by code.
Wind uplift: The force wind applies by lifting shingles from the edge upward, breaking the sealant bond and peeling them off. Concentrated at roof edges, rakes, and corners — which is why starter strips and proper edge nailing matter most in those spots.
Workmanship warranty: The roofing contractor's warranty on their own installation — separate from the manufacturer's warranty on the materials. Typical range is 2 to 25 years. A 10-year workmanship warranty from an established local roofer is often worth more than a 25-year one from a company that may not be around that long.

Z

Zinc strip: A narrow strip of zinc or galvanized metal installed at or near the roof ridge. Each rain washes a trace amount of dissolved zinc down the roof, suppressing moss and algae regrowth. Cheap preventative maintenance that pays off in humid, shaded climates.