Deck Stairs Overhang
The distance your joists can safely cantilever or overhang a drop beam is determined by the size of the joists the wood type and grade of the lumber and the spacing between joists.
Deck stairs overhang. There are two ways to attach stair stringers to your deck. I believe you are using the Trex style grooved decking that utilizes the invisible clips. Push one tread against the back of the stringer center and fasten with two 3 galvanized deck screws per side.
Most composite decking should overhang the decks substructure ¾ 18mm but may be limited to only a 12 12mm or as great as a 1 ½ 38mm. The Rule of Thumb for Decks. According to the IRC the minimum tread depth must be 10 inches as measured horizontally on the flat surface of the step from one riser to the next.
These measurements must be uniform throughout an entire flight of steps varying by no more than 0375 inches. On commercial buildings and interior residential stairs the rise and runs can be significantly different. Overhanging deck boards not only make the deck look better but also helps to protect the substructure.
This means the installed deck boards should have at least 175 to 275 overhang before the fascia is installed. Overhanging Decking is good for your deck. Stair nose is used to create a decorative finished edge on a stairstep or staircase.
A seven to seven and three quarter inch rise is the right range for an outdoor deck. Many building departments limit joist cantilevers to 24 maximum. When installing the tread many builders project the front end of the deck boards over the stringer by the thickness of the riser as well as about an inch as a nose.
There are several reasons to overhang decking plus limitations in decking overhang. How much overhang should a composite deck have. Leave 14 between the first and second tread board and attach with deck screws.