Roofing glossary
Roofing terms describe layers, edges, drainage and transitions. Understanding a few key words makes estimates easier to compare and helps property owners ask precise questions. The decision should also account for flashing: formed material that redirects water at transitions.
Roof layers
Decking is the structural surface; underlayment or membrane provides a secondary water layer; the field covering is the visible shingle, panel or membrane.
Edges and transitions
Eaves are lower edges, rakes are sloped gable edges, valleys collect water and flashing directs water at walls, chimneys, skylights and penetrations.
Low-slope terms
A drain, scupper or gutter removes water; a curb raises equipment or skylights; cover board protects insulation; a seam joins membrane sheets.
Details worth checking
- Deck: structural roof substrate
- Flashing: formed material that redirects water at transitions
- Underlayment: layer beneath steep-slope roofing
- Membrane: continuous low-slope water barrier
- Penetration: pipe, vent or equipment passing through the roof
- Ponding: water remaining after normal drainage
- Counterflashing: upper flashing that protects base flashing
- Cricket: small raised roof that diverts water around an obstruction
Continue with a related roofing topic
Roofing resources
The resource library brings together cost planning, material comparisons, maintenance schedules, emergency guidance, warranties and roofing terminology for British Columbia properties.Roofers Langley
Review langley-headquartered roofing and exterior services across British Columbia with practical detail on condition, scope and next steps.Insurance and storm-damage guide
Roof damage coverage depends on the policy, cause and condition.Apply the information to the actual roof
Share the property, roof type, observed condition and decision timeline. A site-specific review can confirm which parts of the guidance fit and where the scope needs to change. Decking is the structural surface; underlayment or membrane provides a secondary water layer; the field covering is the visible shingle, panel or membrane.
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