Abrasion Resistance: Ability of roofing materials to withstand wear caused by foot traffic, equipment, and environmental exposure over time.
Absorption: The capacity of a material to take in moisture, which can affect insulation performance and durability.
Accelerated Weathering: Laboratory testing process simulating long-term environmental exposure such as UV, rain, and temperature changes.
Asphalt: A petroleum-based waterproofing material commonly used in shingles and modified bitumen systems.
Adhesion: The ability of roofing materials to bond effectively to substrates or other layers.
Base Sheet: Initial layer installed over the roof deck, forming the foundation for additional roofing layers.
Bitumen: Waterproofing compound used in BUR and modified roofing systems, providing durability and flexibility.
Blistering: Raised bubbles on a roof surface caused by trapped moisture or air expansion.
Built-Up Roof (BUR): Multi-layer roofing system composed of bitumen and reinforcing fabrics for durability.
Backwater: Water that flows backward due to drainage blockage, often leading to leaks.
Cap Flashing: Protective metal component installed over base flashing to prevent water infiltration.
Cap Sheet: Top protective layer in roofing systems designed to resist UV and weather exposure.
Condensation: Formation of moisture when warm air meets cooler surfaces, often leading to interior damage.
Core Sample: Extracted portion of a roof used to evaluate layers, insulation, and overall condition.
Cricket: Raised structure designed to divert water around penetrations or equipment.
Deck: Structural surface supporting the roofing system, typically made of steel, wood, or concrete.
Drainage: System that ensures proper water runoff to prevent ponding and structural damage.
Dead Load: Permanent weight of roofing materials and equipment applied to a structure.
Delamination: Separation of roofing layers due to moisture or poor adhesion.
EPDM: Synthetic rubber membrane widely used in commercial roofing due to flexibility and durability.
Expansion Joint: Designed separation allowing building movement without damaging roofing systems.
Eave: Lower edge of a roof that often extends beyond the wall for water runoff.
Edge Metal: Metal components installed at roof edges to protect against water intrusion.
Flashing: Material installed at joints and transitions to prevent water infiltration.
Fastener: Mechanical component used to secure roofing materials to the deck.
Fascia: Vertical finishing edge at the roof perimeter supporting gutters.
Field of Roof: Main area of the roof excluding edges and penetrations.
Gutter: System that collects and channels rainwater away from the structure.
Granules: Protective mineral coating on shingles that shields against UV rays.
Green Roof: Roof system partially or fully covered with vegetation.
Heat Welding: Process used in thermoplastic systems like TPO to fuse seams together.
HVAC Curb: Raised platform supporting rooftop equipment and protecting roof penetrations.
Hydrostatic Pressure: Pressure exerted by standing water that can lead to leaks.
Insulation: Material used to improve energy efficiency and thermal performance.
Infiltration: Uncontrolled entry of air or water into the building envelope.
Ice Dam: Accumulation of ice at roof edges causing water backup.
Joint: Connection point between two roofing components or materials.
Joist: Structural support element beneath the roof deck.
Kettle: Equipment used to heat asphalt during installation of BUR systems.
Kickout Flashing: Flashing installed to direct water away from walls.
Leak: Unwanted entry of water through the roofing system.
Low-Slope Roof: Roof with minimal incline, commonly used in commercial buildings.
Lift: Layer of material applied during roofing installation.
Membrane: Primary waterproofing layer of a roofing system.
Modified Bitumen: Asphalt-based system enhanced with polymers for flexibility.
Moisture Intrusion: Penetration of water into roofing components.
Nail Base: Prepared surface for fastening roofing materials.
Non-Destructive Testing: Inspection methods that do not damage the roof.
Overlay: Application of a new roofing system over an existing one.
Oxidation: Degradation of materials due to prolonged exposure to oxygen and sunlight.
Overburden: Materials placed above the membrane, such as pavers or soil.
Quality Control: Procedures ensuring roofing installation meets required standards.
Qualification: Verification of contractor or material performance.
Roof Life Extension: Process of extending a roof’s lifespan using coatings or restoration systems.
Recover: Installation of a new membrane over an existing roof.
Ridge: Highest horizontal point of a roof.
Roof Assembly: Complete system including deck, insulation, and membrane.
Seam: Joint where two roofing materials meet.
Slope: Degree of incline affecting water drainage.
Substrate: Surface on which roofing materials are installed.
Single-Ply: Roofing system consisting of one membrane layer.
TPO: Thermoplastic membrane known for energy efficiency and durability.
Tear-Off: Removal of an existing roofing system before replacement.
Thermal Movement: Expansion and contraction caused by temperature changes.
Torch-Down: Modified bitumen system applied using heat.
Underlayment: Layer installed beneath roofing materials for additional protection.
Uplift Resistance: Ability of a roof system to resist wind forces.
Ventilation: Airflow system that prevents moisture buildup and regulates temperature.
Vapor Barrier: Material that prevents moisture diffusion through the roof system.
Waterproofing: Protection against water penetration.
Wind Uplift: Force that can lift roofing materials during high winds.
Warranty: Guarantee covering materials or workmanship.
XPS Insulation: Extruded polystyrene insulation with high moisture resistance.
Yield Strength: Maximum stress a material can withstand before deforming.
Zinc Coating: Protective layer preventing corrosion in metal roofing components.