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Steps 5 - 10
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5. Hold the side casing in place. Predrill nail holes every 12 to 16 in., using a drill bit about 1/32 in. smaller than the nail size. Stay 1 in. away from the ends to avoid splitting. Drive 4d finishing nails into the jamb and 6d finishing nails into the wall.
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6. Cut the corresponding angle on the top casing, leaving the opposite side at least 1 in. overlong. Check your miter at the second corner with your test pieces, and adjust if necessary to fit tight. Then mark the opposite corner on the top casing, cut it and tack it up.
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7. Cut the second side casing about 1 in. overlong. Then hold the casing backward and parallel to the door jamb. Make a mark where the edge of the side casing intersects the upper edge of the top casing. Cut the side casing about 1/32 in. overlong. Slide the casing into place. Check your fit, and then trim it to its final length. Once the miter fits, nail the casing in place.
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8. Align the miters and predrill a 1/16-in. hole for 3d finish nails, one from the top and one from the side. Hold a piece of cardboard against the wall to prevent marring the wall while drilling.
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9. Drive the nails into the casing gradually, alternating between the two nails so the miter doesn’t slide out of
alignment. Use cardboard again between the wall and the hammer to avoid marring the wall.
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10. Tap the nails just below the surface with a hammer and a nail set.
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