2x12 Stair Tread Span

Width difference is 3 8 based on all treads 311 7 4 3 stair tread nosing must extend out to a maximum of 1 past front of riser unless the tread is 11 or larger just like above 3 8 max.

2x12 stair tread span.

The rim joist must be able to support the additional load of the stairs. I mount stair stringers directly to 2x12 rim joists or to a header set directly beneath 2x8 or 2x10 rim joists. Often this maximum span is dangerously exceeded resulting in overspanned stringers that will deflect and cause the connection at the deck to pull loose and fail. Only a 2x12 rim joist has enough depth to fasten the stringer hardware to it and provide enough height for the last riser figure 12.

You will need to remove the thickness of the riser board from the top stair and remove the thickness of the tread board from the bottom stair. Discrepancy is allowed the reason for the codes. Timberstrand lsl stair stringers and sturdistep stair treads specifier s guide 9010 ember 2015sept 3 1 1 3e timberstrand lsl sairt stringers maximum stringer run 100 psf live load 12 psf dead load simple span stringer run without intermediate support. This configuration results in an effective throat depth of approximately 5 inches for a horizontal span of 12 feet and 3 inches.

3 steps steel stair stringer black 7 1 2 in. The minimum recommended size for a deck stair stringer is 2x12 which has a maximum recommended unsupported span of 6 feet. Includes 1 stair riser price. Consider 15 risers at 7 inch tall with 10 inch wide treads and stringers cut from spf no.

The calculator will provide you with the number of stairs riser height and tread depth to cut your stringers. Composite anti slip stair tread 48 in. 311 7 4 2 minimum tread depth is 10 max.