Flashing

Patterns

Gutters and Downspouts

Builder 3&2 Volume 02 - Construction manual for building structures
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Figure 4-10.-Flashing of material changes: A. Stucco above, siding below, B. Vertical siding above, horizontal below. wood backing strips or sheathing. In a single course, a 3d or 4d zinc-coated shingle nail is commonly used. In a double course, where nails are exposed, a 5d zinc-coated nail with a small flat head is used for the top course, and a 3d or 4d size for the undercourse. Use building paper over lumber sheathing. FLASHING Flashing should be installed at the junction of material changes, chimneys, and roof-wall intersections. It should also be used overexposed doors and windows, roof ridges and valleys, along the edge of a pitched roof, and any other place where rain and melted snow may penetrate. To prevent corrosion or deterioration where unlike metals come together, use fasteners made of the same kind of metal as the flashing. For aluminum flashing, use only aluminum or stainless steel nails, screws, hangers, and clips. For copper flashing, use copper nails and fittings. Galvanized sheet metal or terneplate should be fastened with galvanized or stainless steel fasteners. (Terneplate is a steel plate coated with an alloy of lead and a small amount of tin.) One wall area that requires flashing is at the inter- section of two types of siding materials. For example, a stucco-finish gable end and a wood-siding lower wall should be flashed (fig. 4-10, view A). A wood molding, such as a drip cap, separates the two materials and is covered by the flashing, which extends at least 4 inches above the intersection. When sheathing paper is used, it should lap the flashing (fig. 4-10, view A). When a wood-siding pattern change occurs on the same wall, the intersection should also be flashed. A vertical board-sided upper wall with horizontal siding below usually requires some type of flashing (fig. 4-10, vie w B). A small space above the molding provides a drip for rain. This will prevent paint peeling, which could occur if the boards were in tight contact with the molding. A drip cap (fig. 4-7) is sometimes used as a terminating molding. DOOR AND WINDOW FLASHING The same type of flashing as shown in figure 4-10, view A, should be used over door and window openings exposed to driving rain. However, window and door heads protected by wide overhangs in a single-story structure with a hip roof do not ordinarily require the 4-9

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