this is part three in our series on how to install double floor joist, except in this video we will be using a wood beam to make the structural home repair. this video will provide you with a few
notches will compromise the strength of the new joists, but some notches are acceptable, depending on their location. then set new joists (same height as existing ones) alongside the old. tack a beam under the sagging joists. nailing two 2x4s together will work to span about three joists, unless the sag is under a weight-bearing wall.
the best way to retrofit radiant floor heating without disturbing an existing floor is to do it from below, against the underside of the subfloor. in most houses, the only place to do this is on a first floor where joist bays are open to the space below. it can go under most existing flooring, including wood, tile, vinyl, and even carpet.
the best way to limit annoying flex in a floor is to make sure that joists are sized correctly before a house or addition is built. building codes specify the minimum joist depth and spacing (typically 12 or 16 inches on center) for spans up to 20 feet, but those requirements are intended to prevent plaster ceilings from cracking, not to
of the existing joist. use a sledgehammer or a pry bar to force the bottom of the new joist along the mudsill and center support beam of the floor system (or the opposite mudsill on short spans) until it’s flat against the existing joist. nail the new joist to the existing joist with two rows of 10d to 16d nails spaced 6 in. on center.
bridging, or “x-bracing,” allows joists to share weight. as a footstep falls on one joist, some of the force is transferred to neighboring joists. even if your joists already have a row of bridging at the center of the span, adding a row on each side of the existing bridging will stiffen the floor.
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add joists, beam to lift sagging floors . as an example, 2-by-6-inch no. 2 grade wood floor joists set 16 inches apart can span up to 10 feet 4 inches, whereas a 2-by-8-inch floor joist can
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