Figure 4-13.-Gutters and downspouts

Builder 3&2 Volume 02 - Construction manual for building structures
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Figure 4-13.-Gutters and downspouts: A. Half-round gutter; B. “K” style gutter C. Round downspout; D. Rectangular downspout. foundation. On flat roofs, water is often drained from one or more locations and carried through an inside wall to an underground drain. All downspouts connected to an underground drain should be fitted with basket strainers (fig. 4-1 2) at the junctions of the gutter. Perhaps the most commonly used gutter is the type hung from the edge of the roof or fastened to the edge of the cornice fascia. Metal gutters may be the half-round (fig. 4-13, view A) or “K” style (view B) and may be made of galvanized metal, copper, or aluminum. Some have a factory-applied enamel finish. Downspouts are round or rectangular (fig. 4-13, views C and D). The round type is used for the half-round gutters. They are usually corrugated to provide extra stiffness and strength. Corrugated patterns are less likely to burst when plugged with ice. On long runs of gutters, such as required around a hip-roof structure, at least four downspouts are desirable. Gutters should be installed with a pitch of 1 inch per 16 feet toward the downspouts. Formed or half-round gutters are suspended with flat metal hangers (fig. 4-14, views A and B). Spike and ferrule hangers are also used with formed gutters (view C). Gutter hangers should be spaced 3 feet OC. Gutter splices, corner joints, and downspout connections should be watertight. Downspouts should be fastened to the wall by leaderstraps (fig. 4-12) or hooks. One strap should be installed at the top, one at the bottom, and one at each intermediate joint. An elbow is used at the bottom to guide the water to a splash block Figure 4-14.-Gutter hangers: A. Flat metal hanger with half-round gutter; B. Flat metal hanger with “K” style metal gutter; C. Spike and ferrule with formed gutter. 4-11

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