Floor Joist 2 X 10 Or 2 X 8

Treated lumber is critical to the performance and safety of an entire system or construction such as deck joists beams and ledger.

Floor joist 2 x 10 or 2 x 8.

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. 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. 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. Spaced o c species grade 30 lb ft 2.

Use an approved hanger or a 2 x 2 ledger strip on flush beams for spans greater than 12. 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. Scn smooth shank hdg connector nail 600 pack. 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.

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. Steel joists offer a stronger straighter and potentially safer alternative to wood. 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. I would use at least 2 2 x 8 sandwiched together if not 2 x 10 or 2 x 12.

When framing openings use header and trimmer joists. This will give you a much stronger beam. But larger is not always better when builders are constructing a home or adding a room addition. Steel joists such as trex elevations are machine made making each joist an identical twin.

2 x 8 joists spanning only 8 feet is more than enough. For example in the joist span table below the highlighted cell shows that 2 x 8 southern yellow pine joists that have a grade of 2 and are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. 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.