Floor Joist 2 X 10 Or 2 X 8

Use an approved hanger or a 2 x 2 ledger strip on flush beams for spans greater than 12.

Floor joist 2 x 10 or 2 x 8.

2 prime ground contact pressure treated lumber simpson strong tie h2 5a 18 gauge zmax galvanized hurricane tie simpson strong tie strong drive 1 1 2 in. Depending on the length of the home and the number of floor joists the additional cost for the heavier floor joists may not be very substantial. Scn smooth shank hdg connector nail 600 pack. But larger is not always better when builders are constructing a home or adding a room addition.

General rule of thumb is only cantilever 25 percent of the total length of the joist at a maximum some say you can go 33 percent and code does allow that. I would use at least 2 2 x 8 sandwiched together if not 2 x 10 or 2 x 12. The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example. Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor.

2 x 8 joists spanning only 8 feet is more than enough. Steel joists offer a stronger straighter and potentially safer alternative to wood. Must use ground contact pressure treated lumber where lumber is at risk for poor air circulation less than six inches from the ground or has poor or no water drainage below the structure. Douglas fir 2 by 10 joists graded as structural select allows joist spans up to 21 feet for a live load of 30 pounds per square foot when spaced 12 inches apart 19 feet 1 inch for 16 inch spacing and 16 feet 8 inches for 24 inch spacing.

Maximum end notches for 2 x 8 2 x 10 and 2 x 12 respectively are 1 13 16 2 5 16 and 2 13 16. When framing openings use header and trimmer joists. Spaced o c species grade 30 lb ft 2. However with this type of situation the heavier the better so you will have a very stable and secure platform with the use of 2 x 10 s.

Treated lumber is critical to the performance and safety of an entire system or construction such as deck joists beams and ledger. Even when using the strongest wood to build joists for a deck that wood is still subject to the elements and can bend bow or warp with time. Steel joists such as trex elevations are machine made making each joist an identical twin.