The Homeowner's
Roofing Glossary
Decode the jargon. From insurance terms to roofing components, we've compiled everything you need to understand your roof and make confident decisions.
Insurance & Claims Terminology
Actual Cash Value (ACV)
The value of your roof at the time of damage. It is calculated by taking the Replacement Cost Value (RCV) and subtracting depreciation based on the roof's age and condition. This is typically the amount of the first check you receive from your insurance company.
Replacement Cost Value (RCV)
The total cost to replace your roof with materials of similar kind and quality at current market prices, without deducting for depreciation. If you have an RCV policy, you will receive the depreciation amount after the work is completed.
Recoverable Depreciation
The difference between the Replacement Cost Value (RCV) and the Actual Cash Value (ACV). Once your roof is fully replaced and the final invoice is submitted, the insurance company releases these funds to you to cover the final cost of the project.
Deductible
The out-of-pocket amount you are responsible for paying before your insurance coverage kicks in. In Alabama, it is illegal for a roofing contractor to waive, absorb, or pay your deductible.
Supplement
An additional request for funds submitted to the insurance company when hidden damage is discovered during the roof replacement, or when the initial adjuster's estimate missed required materials or local building code upgrades.
Adjuster
A representative sent by your insurance company to inspect your property, assess the storm damage, and determine the initial payout amount.
Date of Loss
The exact date the storm damage (hail, wind, or tree impact) occurred. You must report claims within a specific timeframe from the date of loss.
Peril
The specific cause of damage or loss, such as wind, hail, fire, or lightning. Your insurance policy outlines which perils are covered.
Roofing Materials & Components
Architectural Shingles
Premium, multi-dimensional asphalt shingles that offer superior wind resistance, longevity, and a highly textured appearance compared to standard 3-tab shingles.
Decking (Sheathing)
The wooden boards (usually OSB or plywood) attached to the roof trusses or rafters. This forms the foundation that the rest of your roofing system is nailed into.
Underlayment
A water-resistant or waterproof barrier installed directly over the roof decking, under the shingles. Modern roofs use high-performance synthetic underlayment for better protection.
Ice & Water Shield
A specialized, self-sealing waterproof membrane installed in the most vulnerable areas of the roof, such as valleys, around chimneys, and along the eaves, to prevent water intrusion.
Flashing
Metal pieces installed at intersections, valleys, edges, and around roof penetrations (like chimneys and skylights) to direct water away and prevent leaks.
Pipe Boot
A specialized piece of flashing (often made of rubber and metal) that seals the area where plumbing vent pipes exit the roof. Pipe boot failures are one of the most common causes of roof leaks.
Drip Edge
Metal flashing installed along the edges of the roof (eaves and rakes) to help water drip clear of the underlying fascia and protect the wood from rotting.
Ridge Cap
Specialized shingles designed to fold over the peak (ridge) of the roof, sealing the joint where the two slopes meet.
Fascia
The horizontal boards attached to the lower ends of the roof trusses, where gutters are typically installed.
Soffit
The exposed underside of the roof overhang. It often contains intake vents to allow fresh air into the attic.
Damage & Common Issues
Granule Loss
The shedding of the protective mineral granules on the surface of asphalt shingles. While some loss is normal over time, excessive loss due to hail or aging exposes the asphalt to UV rays, leading to rapid deterioration.
Creased Shingle
A shingle that has been lifted by high winds and folded backward, creating a permanent crease. This breaks the shingle's seal and compromises its ability to shed water.
Blistering
Bubbles or pimples on the surface of asphalt shingles, usually caused by trapped moisture or poor attic ventilation. They can pop and lead to premature failure.
Alligatoring
A pattern of cracking on the surface of older, flat or low-slope roofs that resembles alligator skin, indicating the material has lost its elasticity.
Ponding Water
Water that remains on a flat or low-slope roof for more than 48 hours after rain. Ponding accelerates roof deterioration and increases the risk of leaks.
Nail Pop
When a roofing nail backs out of the decking over time, pushing up on the shingle above it and potentially causing a leak.
Process & Terminology
Tear-Off
The process of completely removing the old roofing materials down to the bare wooden decking. This allows the contractor to inspect the decking for rot or damage before installing the new roof.
Roof Over (Overlay)
Installing a new layer of shingles directly over an existing layer. This is generally not recommended as it hides decking issues, adds excessive weight, and voids manufacturer warranties.
Square
A roofing measurement term. One square equals 100 square feet of roof area (a 10' x 10' area).
Pitch
The angle or steepness of the roof, calculated by how many inches the roof rises vertically for every 12 inches of horizontal run (e.g., a 6/12 pitch).
Manufacturer Warranty
A guarantee provided by the company that makes the roofing materials (like Owens Corning or CertainTeed) covering defects in the product itself.
Workmanship Warranty
A guarantee provided by the roofing contractor covering errors in the installation process.
Still Have Questions?
You don't have to be a roofing expert to get a premium roof. Schedule a free inspection and our team will walk you through everything, step by step.