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1. Cut the plumb cut at the top of the I-joist. Use a piece of plywood in the web or a cutting jig for the saw shoe to ride on.

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2. Attach the web stiffeners to each side with three 8d nails, leaving a 1/4-inch gap at the top. Clinch the nail points.

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3. Attach the hanger to the I-joist. First, nail the sloped seat to the bottom of the rafter. Next, bend the hanger against the plumb cut and put the rest of the nails into the web stiffener and bottom flange.