2x12 Stair Tread Span

The minimum recommended size for a deck stair stringer is 2x12 which has a maximum recommended unsupported span of 6 feet.

2x12 stair tread span.

I mount stair stringers directly to 2x12 rim joists or to a header set directly beneath 2x8 or 2x10 rim joists. 311 7 4 2 minimum tread depth is 10 max. 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. Timberstrand lsl stair stringers and sturdistep stair treads specifier s guide 9010 september 2015 2 1 1 3e timberstrand lsl stair stringers suggested residential stringer attachment details 40 psf live load and 12 psf dead load high end 1 7minimum throat depths may be reduced by an additional for 11 8 and 14 material depths if 2x4 reinforcement is.

Consider 15 risers at 7 inch tall with 10 inch wide treads and stringers cut from spf no. 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. You can now draw the notches for the stairs onto your 2x12 stair stringers. 3 steps steel stair stringer black 7 1 2 in.

Includes 1 stair riser price. 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. The calculator will provide you with the number of stairs riser height and tread depth to cut your stringers. 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.

Composite anti slip stair tread 48 in. Composite anti slip stair tread 48 in. 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.