Cover Board

Roofing terms · plain-language definition, with its source

Roofing terms · definition

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

Source: Wikipedia — Flat Roof (Cover Board)

Where this comes up on this site

  • Insulation

    Material that resists heat flow, rated by R-value, installed in walls, ceilings, and floors. Opened walls are the opportunity to upgrade…

  • 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…

  • Counter Flashing

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

  • Decking

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

  • Coping

    The protective cap on top of a parapet wall that sheds water off both sides. Failed coping is a major parapet leak source.

  • Decking Replacement

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

  • Cool Roof

    A roof with high solar reflectance and emittance that lowers roof temperature and cooling costs; rated by the Cool Roof Rating Council.

  • Deductible

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

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