Educational Resource
Roofing Glossary
A glossary of 29 common roofing terms and definitions, compiled by Alron Construction — a licensed roofing contractor (CCC1328819) serving Central Florida since 2008.
Roofing Materials
- Architectural Shingles
- A premium asphalt shingle with a dimensional, layered appearance that provides better wind resistance and longer lifespan than three-tab shingles. Also called dimensional or laminated shingles. Typical lifespan in Central Florida is 25 to 30 years.
- Standing Seam Metal Roof
- A metal roofing system with raised interlocking seams that run vertically from the ridge to the eave. The seams are raised above the flat panel surface, which prevents water intrusion. Standing seam metal roofs can withstand winds up to 160 mph and last 40 to 60 years.
- TPO (Thermoplastic Polyolefin)
- A single-ply reflective roofing membrane commonly used on commercial flat roofs. TPO is heat-welded at the seams, making it highly resistant to leaks. It reflects UV radiation and helps reduce cooling costs in hot climates like Florida.
- Modified Bitumen
- A flat roofing material made from asphalt modified with plastic or rubber polymers for improved flexibility and durability. It is applied in overlapping sheets using heat, adhesive, or a self-adhering backing. Common on commercial and low-slope roofs.
- Concrete Tile Roofing
- Roofing tiles made from a mixture of cement, sand, and water that are molded under high pressure. Concrete tile roofs are extremely durable, fire-resistant, and can last 50 or more years. They are common in Florida due to their wind and impact resistance.
- Three-Tab Shingles
- The most basic and economical type of asphalt shingle. Each shingle has three uniform tabs that create a flat, uniform appearance. Three-tab shingles have a shorter lifespan (15 to 20 years) and lower wind resistance than architectural shingles.
Roof Components
- Underlayment
- A waterproof or water-resistant barrier installed directly onto the roof deck before any other roofing material. Underlayment acts as a secondary layer of protection against water infiltration. In Florida, synthetic underlayment is required by code on most new installations.
- Flashing
- Thin pieces of metal or other waterproof material installed at roof joints, valleys, chimneys, vents, and other penetrations to direct water away from seams. Damaged or improperly installed flashing is one of the most common causes of roof leaks.
- Ridge Cap
- Specially shaped shingles or metal trim installed along the peak (ridge) of a roof where two slopes meet. Ridge caps seal the joint and prevent water, wind, and debris from entering at the highest point of the roof.
- Soffit
- The finished underside of the roof overhang that connects the outer edge of the roof to the exterior wall of the building. Soffits often contain ventilation openings that allow air to circulate through the attic, which helps regulate temperature and moisture.
- Fascia
- The vertical board that runs along the lower edge of the roof, directly behind the gutter. Fascia supports the bottom row of roof tiles or shingles and provides an attachment point for gutters. Damaged fascia can allow water and pests into the roof structure.
- Roof Deck
- The structural surface — typically plywood or oriented strand board (OSB) — that sits on top of the rafters or trusses and serves as the base for all roofing materials. A compromised roof deck must be repaired or replaced before a new roof can be installed.
- Drip Edge
- An L-shaped metal strip installed along the edges of a roof to direct water runoff away from the fascia and into the gutter. Florida Building Code requires drip edge on all new roof installations.
- Roof Valley
- The V-shaped channel where two roof slopes meet at an internal angle. Valleys handle a high volume of water runoff and are a common leak point if not properly lined with flashing or an ice-and-water shield.
Damage Types
- Wind Uplift
- The force of wind pushing upward on a roof surface, which can lift shingles, break seals, and in severe cases detach sections of the roof deck. According to the National Roofing Contractors Association, wind uplift damage is the leading cause of roof failure during hurricanes.
- Hail Damage
- Roof damage caused by hailstones striking the surface. On asphalt shingles, hail causes circular dents, granule loss, and cracked or fractured shingles. Central Florida recorded over 400 hail events in the past five years, according to National Weather Service data.
- Granule Loss
- The wearing away of the small mineral granules embedded in the surface of asphalt shingles. Granules protect shingles from UV degradation and improve fire resistance. Excessive granule loss — visible as bare dark spots on shingles or granules collecting in gutters — indicates the shingle is nearing the end of its useful life.
- Ponding Water
- Standing water that remains on a flat or low-slope roof for more than 48 hours after rainfall. Ponding water adds weight stress to the roof structure, accelerates membrane deterioration, and can lead to leaks if the membrane is compromised.
Process & Inspections
- Tear-Off
- The process of completely removing all existing roofing materials down to the roof deck before installing a new roof. Florida Building Code typically requires a full tear-off rather than layering new shingles over old ones, which allows inspection of the deck for hidden damage.
- Roof Inspection
- A professional examination of the roof's condition, including shingles or membrane, flashing, ventilation, gutters, and the roof deck. Inspections identify damage, code violations, and maintenance issues. According to the National Roofing Contractors Association, roofs should be professionally inspected at least twice per year.
- Permit (Roofing)
- A legal authorization from the local building department required before roofing work begins. In Brevard County, Florida, permits are required for all roof replacements and most major repairs. The permit process ensures the work meets current Florida Building Code requirements.
- Final Inspection
- A building department inspection conducted after roofing work is completed to verify the installation meets all applicable building codes. In Florida, the roofing contractor is responsible for scheduling and passing the final inspection before the permit is closed.
Insurance Terms
- Hurricane Deductible
- A separate, higher deductible that applies specifically to hurricane damage claims on Florida homeowner insurance policies. The deductible is typically 2% to 5% of the home's insured value. For a home insured at $300,000 with a 2% hurricane deductible, the homeowner pays the first $6,000 of any hurricane claim.
- Actual Cash Value (ACV)
- An insurance payout method that deducts depreciation from the replacement cost of a damaged roof. Under an ACV policy, a 15-year-old roof receives a significantly lower payout than a new roof would cost to install. Many Florida insurers have shifted to ACV policies for roofs older than 10 years.
- Replacement Cost Value (RCV)
- An insurance payout method that covers the full cost to replace a damaged roof with new materials of like kind and quality, without deducting for depreciation. RCV policies generally result in higher claim payouts than ACV policies.
- Wind Mitigation Inspection
- A specialized inspection that documents the wind-resistant features of a home's roof, including the roof shape, attachment method, deck type, and opening protection. In Florida, a passing wind mitigation inspection can qualify homeowners for insurance premium discounts of 10% to 45%, according to the Florida Office of Insurance Regulation.
Codes & Standards
- Florida Building Code (FBC)
- The statewide construction code that governs all building work in Florida, including roofing. The FBC sets requirements for wind resistance, material standards, installation methods, and inspections. It is updated every three years and is among the strictest building codes in the United States.
- Miami-Dade NOA (Notice of Acceptance)
- A testing and approval standard for building products used in the High-Velocity Hurricane Zone of South Florida. Products with Miami-Dade NOA certification have passed the most rigorous wind and impact testing in the country. Many Central Florida contractors and insurers prefer NOA-rated products even outside the HVHZ.
- Wind Zone Rating
- A classification assigned to geographic areas based on the maximum wind speeds buildings must be designed to withstand. Most of Brevard County falls in the 150 mph wind zone under the Florida Building Code, meaning roofing materials and installation methods must be rated to resist sustained winds of that speed.
Have a Roofing Question?
If you need help understanding your roof's condition or what repairs are needed, schedule a free inspection with a licensed Alron inspector.