Figure 6-25.-Rafter terms.The structural relationship between the rafters andthe wall is the same in all types of roofs. Therafters are NOT framed into the plate, butsimply nailed to it. Some are cut to fit the plate.In hasty construction, rafters are merely laid ontop of the plate and nailed in place. Rafters mayextend a short distance beyond the wall to formthe eaves and protect the sides of the building.Figure 6-25 shows a typical roof framing plan.The following rafter terms and definitionssupplement the notes in the drawing:COMMON RAFTERS—Rafters that extendfrom the plates to the ridgeboard at right anglesto both.HIP RAFTERS—Rafters that extend diago-nally from the corners formed by perpendicularplates to the ridgeboard.VALLEY RAFTERS—Rafters that extendfrom the plates to the ridgeboard along the lineswhere two roofs intersect.HIP JACKS—Rafters whose lower ends reston the plate and whose upper ends rest againstthe hip rafter.VALLEY JACKS—Rafters whose lower endsrest against the valley rafters and whose upperends rest against the ridgeboard.CRIPPLE JACKS—Rafters that are nailedbetween hip and valley rafters.JACK RAFTERS-Hip jacks, valley jacks, orcripple jacks.TOP OR PLUMB CUT—The cut made at theend of the rafter to be placed against theFigure 6-26.-Additional terms used in rafter layout.6-22
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