Decking

Roofing terms · plain-language definition, with its source

Roofing terms · definition

The structural panel surface (plywood/OSB) fastened to rafters or trusses that everything else is attached to. Rotted decking is replaced before re-roofing.

Source: Wikipedia — Roof Deck

Where this comes up on this site

  • Plywood

    An engineered panel of thin wood veneers glued in cross-grain layers for strength and stability. Preferred over OSB for cabinet boxes and…

  • Decking Replacement

    Replacing deteriorated roof sheathing during a tear-off — a common change-order cost only revealed once the old roof is off.

  • Cricket / Saddle

    A small peaked structure built behind a chimney or wide penetration to divert water around it. Code-required above a chimney width thresh…

  • Deductible

    The amount the homeowner pays before insurance contributes. Some policies carry a separate, higher wind/hail deductible.

  • Cover Board

    A rigid board over insulation on a low-slope roof providing a durable substrate for the membrane and better impact resistance.

  • Designer / Luxury Shingle

    Premium heavyweight asphalt shingles mimicking slate or shake, the top asphalt tier in cost and appearance.

  • Counter Flashing

    Flashing set into a masonry joint (chimney/parapet) that laps over step or base flashing to seal the top edge.

  • Dormer

    A roofed projection with a window through the roof slope, adding light and headroom — and several extra flashing/leak details.

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