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1. Bang holes in the wall and check for obstructions. Remove any trim, slit the tape joint along the ceiling and adjoining walls, then remove the drywall from both sides of the wall.
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2. Snap a chalk line about 12 in. out from the wall and cut a slot. Strip 1 ft. of ceiling drywall from one side of the wall. (Use shallow strokes to avoid nicking any electrical cables hidden in the ceiling.)
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3. Examine the ceiling framing to determine the beam. Turn off the electrical power and remove electrical cables, outlets and switches and pull the cable free of the studs. Cap the ends of the exposed wires with electrical connectors.
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4. Tack a single top 2x4 plate under the floor joists and another directly below it to the floor. Add a second top plate, then tap in and toenail temporary studs every 2 ft.
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5. Knock out the bearing wall studs with a sledge and bend over the leftover nail shanks in the bottom plate to protect your feet.
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6. Cut continuous plates and pry them free. Cut off the leftover nail shanks with a reciprocating saw.
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7. Cut the nails that hold the backer studs and pry them out. You may have to pry open a gap with your chisel to reach the nails. Cut the backer stud in half to remove it.
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8. Assemble two beam cradles from pairs of 2x4s and screw them to the tie plate and floor with 3-in. screws.
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9. Cut the beam to length and cut notches to clear tie plates in adjoining walls.
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Then slip the beam members into place and rest them on the temporary cradles.
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10. Drive shims between the support studs and the bottom of the beam until the beams is tight against the underside of the tie plate.
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11. Cut two snugfitting trimmers for each end of the beam. Tip them into place under the beam and tap them into place. Face or toenail each one with at least six 16d nails.
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12. Cut blocking to fit between the floor joists directly under the trimmers at the beam ends. Toenail and end-nail the blocks to the surrounding framing.
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13. Toenail the beam to the tie plate and to the framing at the ends with 16d nails. Nail the beam members together with three 16d nails spaced every 12 in.
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