in order to attach the floor joists correctly, you will need to improvise and attach a ledger board to the wall. secure it to the wall using nails and 4-inch lag bolts. they should be driven into the wall studs supporting the wall. once the ledger board is secure, attach joist hangers and fasten them to the ledger board.
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follow the rules to keep your floor solid. you can notch and bore joists without sacrificing critical strength, but you must follow the rules. if your home is more than 20 years old, your floor joists are most likely solid wood 2x8s, 2x10s or 2x12s. the notching and boring rules of thumb for solid lumber are shown in fig. b.
3.1401.1a conditioned basements with vented cl spaces cl space will be separated from the conditioned basement conditioned basement a below- or partially below-grade livable space with concrete or finished floor that is intentionally heated or cooled with a continuous air barrier air barrier the separation between the interior and exterior environments of a building that slows air flow
support the joists over a basement are sometimes replaced by frame or masonry walls when the basement area is divided into rooms. floors of the second story are gener- ally supported on load-bearing walls in the first story. wood-frame houses may also be constructed over a cl space with floor framing similar to that used over a base-
most decks are supported in part by a ledger that is attached to the band joist or rim board of the floor system. because this connection is critical to the safety of the deck’s occupants, both the 2015 irc and the latest edition of the american wood council’s dca 6 prescriptive residential wood deck construction guide provide detailed structural design guidance on fastening a deck ledger
how to make floor joists stronger. after several centuries of service, floor joists in older homes may sag or crack. long spans of joists in newer homes may wobble or bounce from foot traffic. as
first-floor live loads have higher requirements than second-floor live loads (40 pounds per square foot vs. 30 psf). a room used solely for sleeping might need to carry only 30 psf, whereas a garage floor over a basement would need 50 psf or higher. an inaccessible attic space, on the other hand, might have a live load of only 20 psf.
divide the length by 16 inches to determine the number of floor joists needed for floor overage. cut a 2-by-4 plank for each joist location to the measured room width using a circular saw. make a plan to set the planks along the edges of the wall, and then in 16-inch intervals between the two edge pieces.