Roofing Glossary: Key Terms Every Homeowner Should Understand

Algae:

• Microorganisms that can grow on shingles, causing discoloration and streaks. Common in humid climates.

Asphalt Shingles:

• Popular roofing material made of asphalt and fiberglass or organic felt. Known for affordability and durability.
  

Blistering:

• Raised areas on shingles caused by trapped moisture or poor ventilation.

Boot:

• A waterproof covering used around roof penetrations like pipes and vents.
  

Chimney Flashing:

• Metal or other waterproof material installed around the base of a chimney to prevent leaks.

Cricket:

• A peaked saddle construction on the high side of a chimney or other roof projection to divert water around it.
  

Decking (or Sheathing):

• The structural base for the roof, usually made of plywood or OSB, to which roofing materials are applied.

Dormer:

• A vertical window projecting from a sloping roof, often used to add light and space to an attic.
  

Eaves:

• The lower edges of the roof that overhang the walls of the building.

EPDM:

• Ethylene Propylene Diene Monomer, a type of durable synthetic rubber roofing membrane used in flat roofs.
  

Fascia:

• The vertical band under a roof edge, often where gutters are attached.

Flashing:

• Pieces of metal or other material installed to prevent water from penetrating the roof around projections, edges, and intersections.
  

Gable:

• The triangular upper part of a wall at the end of a ridged roof.

Granules:

• Crushed rock or other materials embedded in the surface of shingles to protect them from UV rays and add color.
  

Hip:

• The external angle formed by the intersection of two sloping roof planes.

HVAC Boots:

• The flashing or covering used to seal HVAC penetrations in the roof.
  

Ice Dam:

• A buildup of ice along the eaves of a roof that can prevent melting snow from draining, causing leaks.

Insulation:

• Material used to reduce heat transfer and improve energy efficiency in the attic or roof space.
  

Joist:

• Horizontal structural members that support a ceiling or floor, often part of the roof structure.
  

Louvers:

• Ventilation openings or slats to allow air to circulate in the attic or roof space.
  

Membrane:

• A flexible or semi-flexible layer used as a waterproofing layer on flat or low-sloped roofs.

Moss:

• A green, mat-like growth that can accumulate on shingles in damp environments, potentially causing damage over time.
  

Nail-Pop:

• When a nail pushes up through the shingle, causing a raised area or hole.
  

OSB (Oriented Strand Board):

• A type of engineered wood used for roof decking, made from compressed wood strands and adhesive.
  

Pitch:

• The slope of a roof, usually expressed as a ratio of the vertical rise to the horizontal run.

PVC Roofing:

• Polyvinyl Chloride roofing material used in flat and low-sloped roofs for its durability and resistance to moisture.
  

Rafters:

• Sloped structural members that extend from the ridge to the eaves, supporting the roof deck and covering.

Ridge Vent:

• A ventilation system installed along the peak of the roof to allow warm air to escape from the attic.
  

Soffit:

• The underside of the eaves, often ventilated to allow air circulation in the attic.

Starter Strip:

• An asphalt shingle or roll used along the eaves to ensure proper coverage and seal.
  

Tab:

• The portion of a shingle that is visible and not overlapped by the next course.

Tear-Off:

• The process of removing old roofing materials before installing new roofing materials.
  

Underlayment:

• A layer of material (often felt or synthetic) installed over the roof deck before shingles, providing additional protection against moisture.

UV Protection:

• Features in roofing materials designed to resist damage from ultraviolet rays.
  

Valley:

• The internal angle formed by the intersection of two sloping roof planes.

Vent:

• Any outlet for air, such as soffit vents, ridge vents, or gable vents, to allow airflow and reduce moisture buildup.
  

Warranty:

• A guarantee provided by the manufacturer or contractor on the lifespan and performance of the roofing materials.

Wind Uplift:

• The upward force of wind that can lift roofing materials, causing damage if not properly installed.
  

Yield:

• The production or result of a roofing material, often related to coverage area or durability.
  

Zinc Strips:

• Metal strips installed along the ridge of a roof to prevent moss and algae growth through the release of zinc particles.