Stringers, typically cut from 2 x 12s, are the sloped boards that support the other components and carry the weight of people walking on the stairs. They're typically spaced 16 in. on center.
The deck stair landing basic framing is complete and I’m ready to install the stair stringers. Referring the deck stair diagram below, I’ll build the lower stairs first:
Fasten treads to stringers with 2 ?-inch composite decking screws. 28. Attach the composite decking to the deck landing with decking screws; leave a small space between each board.
I don't see many deck stairways built with bracketed stringers, but they're a good alternative to notched stairs in certain situations. The design is similar to housed stringers--where dadoes are routed into the framing to provide shoulders for the treads and riser boards to rest in--but is simpler to build.
To ensure the stairs don’t collapse, it’s wise to have the stringers spaced around 12 inches on center. This is vital if you take giant 2 x 12’s and notch them to create the flat tread area and vertical riser.
Recall that only two solid stringers support the lower stairs because it’s much lower and has a shorter span. Stringer Design Notes. The State of Georgia 2015 Prescriptive Deck Code Amendments (page 5, Figure 33 “Stair Stringer Requirements”) allows maximum unsupported span of 13 ft 3 in for a solid stringer versus only 6 feet for a sawn stringer.
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Stringers are an essential component of your deck stairs as these are the parts that take on the weight of the objects that walk on your stairs. If your stringers fall on uneven terrain, they could misalign, wobble, or simply break sooner rather than later.
The sides of the stairs, or stringers, are cut from 2-by-12 boards. Using a framing square, mark out the portions to be cut away from the stringer. Starting at the top corner of the board, place the square so that one leg is 7.46" (the rise) and the other is at 10” (the tread) .
03 How To Build a Deck: Part 5 – BUILDING DECK STAIRS MAKING THE STRINGERS 01 Set stair gauges on the framing square at the height of the rise and length of the run. 02 Hold the square at the corner of the plank, and mark the top step.
Build exterior deck stairs up to 7′ wide or 9′ wide interior stairs with only 2 stringers- saving labor and materials. Since the riser acts as a load bearing joist, you get an incredibly strong stair that doesn’t squeak.
Before getting into deck stair defects, let’s look at how DCA 6 recommends that stairs should be built, starting with the stringers, risers, treads, and landings, and the components that support them (see “Deck Stair Requirements,” above).