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Gutters and Downspouts
Exterior Doors

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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