An 80 pounds per square foot snow drift load is applied triangularly against the exterior wall at the parapet over a twenty-one-foot span adjacent to a uniform snow load on the roof line. The joist manufacturer must design the joist for the additional snow drift load as shown. The roof sheathing transitions from five-eighths-inch plywood to one-half-inch full plywood fastened with two-and-one-quarter-inch long nails on both sides over a framing member shimmed with a one-eighth-inch plywood shim and ten-penny nails spaced at twelve inches on center.
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