Roof Systems

Building owners and designers have many deck, insulation, and roof covering materials to choose from for low-slope and steep-slope roof systems. The various systems available can fulfill a wide range of functions, such as energy conservation, acoustical and thermal insulation, and water, fire, and wind resistance. Their ability to do this over their expected service life depends on good design, quality materials, good application, and a commitment by building owners to maintenance.
This section is intended to give an overview of the following: materials for lowslope and steep-slope roofing (including deck, insulation and roof coverings), key design considerations, application, warranties, maintenance, and reroofing. At the end of this section, a list of trade associations (Art. 12.20) and a list of publications (Art. 12.21) is given for those readers interested in further specific information.
A roof system is an assembly of interacting roof components designed to weatherproof and, normally, to insulate a building’s top surface. The roof assembly includes the roof deck, vapor retarder and roof insulation (if they occur), and the roof covering.

—–12.1 Roof Decks
—–12.2 Vapor Retarders
—–12.3 Roof Insulation
—–12.4 Low-Slope Roof Coverings
—–12.5 Steep-Slope Roof Coverings
—–12.6 Need for Familiarity with Roof Design
—–12.7 Building Owners’ Responsibility
—–12.8 Building-Code Provisions for Roofs
—–12.9 Effects of Climate
—–12.10 Effects of Roof Size, Shape, and Slope
—–12.11 Deck Suitability
—–12.12 Effects of Rooftop Traffic
—–12.13 Esthetic Considerations
—–12.14 Effects of Wind on Roofs
—–12.15 Protected Membrane Roofs and Plaza Decks
—–12.16 Preroofing Conference
—–12.17 Roofing Warranties
—–12.18 Roof Maintenance
—–12.19 Reroofing

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