Tag Archive for Tag: Roof

Tag: Roof Roof Maintenance

After a good roof has been delivered to the building owner, it is important for the owner to commit to a program of periodic roof inspections and to follow-up maintenance or repairs as needed. While some systems require less maintenance than others, no roof should be forgotten about after it is installed! Semiannual inspections are recommended for all roofs. The purpose of these inspections

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Tag: Roof Reroofing

Replacement of existing roofing or installation of a new roof covering over it is usually much more complicated than roofing a new building. Besides issues that are normally considered in design of a new roof, may additional issues arise when roof replacement is needed. For example, it is not uncommon to find existing undesirable building conditions including those that contributed to the demise of

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Tag: Roof Effects of Roof Size, Shape, and Slope

Roof size and shape often dictate material and system selection. For example, if the roof is only 2 or 3 ft wide and several feet long, a system other than built-up roofing (BUR) would probably be easier to install than BUR. Roof slope is a major factor in determining the rate of flow of rainwater over a roof to a drainage outlet, and

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Tag: Roof Building-Code Provisions for Roofs

Designers should be aware of building-code requirements affecting design of the roof. Model building codes and many state and local codes have provisions related to roof systems (for new construction, as well as reroofing). Fire and wind resistance, material standards, storm water drainage, structural loading, and energy efficiency are some of the many objectives of building codes that are common to roof design. Many

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Tag: Roof Need for Familiarity with Roof Design

A common pitfall for designers is lack of familiarity with the principles of roof design. This is manifested in selection of inappropriate materials or systems or inadequate details, or use of poorly prepared specifications. To assist designers, several periodicals and books are available (Art. 12.21) and seminars are offered by the Roofing Industry Educational Institute and the National Roofing Contractors Association (Art. 12.20). In addition

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Tag: Roof Steep-Slope Roof Coverings

These differ from low-slope roof coverings in that on steep-slope roofs water flows rapidly over exposed units to eaves. Many of the low-slope roof coverings described in Art. 12.4 can be successfully used on steep slopes. Many of the low-slope materials, however, become slick when wet. This should be taken into account before they are specified for steep slopes. Asphalt Shingles These are composed

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Tag: Roof Low-Slope Roof Coverings

Roof coverings may be classified into two main groups in accordance with the slope of the roof. Low-slope roof coverings generally utilize a weatherproofing membrane and are designed for slopes on which water proceeds slowly to drainage outlets. Steep-slope roof coverings are designed for roofs with swift drainage. Generally, they are considered ‘‘water shedding’’ and are comprised of many individual pieces or components installed in

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Tag: Roof Roof Insulation

Many of the insulation products described in the following are available in tapered configurations. Cellular glass is a rigid insulation composed of heat-fused closed glass cells. Cellulosic fibers are generally used as loose-fill insulation. They are made of recycled paper. Glass-fiber batts or blankets (the only difference being the length of the product) are composed of glass fibers and a binding agent. The

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Tag: Roof Roof Decks

A good roof is dependent upon the structural integrity of the deck and compatibility of the deck with the roof covering and other materials attached to it. Following are descriptions of commonly used decks. Cementitious wood-fiber panels are composed of treated wood fibers that are bonded together with portland cement or other binder and compressed or molded in flat panels. These panels provide some

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Tag: Roof Steel Roof Deck

Various types of steel roof deck are available and may be classified in accordance with recommendations of the Steel Deck Institute (SDI). All types consist of long, narrow sections with longitudinal ribs at least 11⁄2 in deep and spaced about 6 in on centers (Fig. 8.14). Other rib dimensions are shown in Fig. 8.14a to c for some standard styles.   Types of Steel

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