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Deck stairs bottom support. Generally footings are concrete and poured into long cardboard tubes. This can be tricky on a slope. The bulk of your work when building your deck is measuring and positioning posts.
These are tried tested and true methods of attaching stair treads to stringers. Supporting joists in the middle of the deck. The stone is easy to level and grade to the proper elevation for the stairs.
Plus I like that stone drains whereas a concrete pad or slab will pool and collect moisture. The stringer must support a design live load of 40 psf for residential decks. Otherwise you must add a cut stringer at midspan to provide enough support.
Therefore the top of the stringer must be anchored with a proper connector keep an eye out for future TiC articles on stringer-to-deck attachment. In the case of a deck it will also provide support for the base of your staircase and a solid place to step off of the stairs to avoid accidents and injuries. Some Other Great Reading.
The strength of stair stringers is considerably weakened by the cuts made to create the stair surfaces and stairs must be strong enough to withstand heavy foot traffic and very stressful conditions. Install 2x8 min framing between the posts to support the upper end of the stair stringers directly under the outside joist of the deck. A couple of conventional methods include notching in a 2x to the bottom of the stringers and using guardrail posts as the link.
Yes a hinge moment is created at the stair case connection to the ledger. Footings go beneath the landing pad. But if you feel the need go ahead and install frost footings.
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