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How do you calculate stair stringers?
How do I calculate a stair stringer? Start by finding the overall height that the staircase will be. Decide the height or “rise” you’ll want for each step. Divide the total height of the staircase by the height or “rise” you want for each step.
Can I use 2×10 for stair stringers?
Pressure-treated or cedar 2×10 or 2×12 can be used depending on the depth of the cut-outs you’ll be using. By code you will need a minimum of 3-1/2″ of material left on the stringer after the cut-outs and that area should also be free of large knots which would weaken the stringer.
How far apart can stair stringers be?
Cut stringers can be spaced no more than 18 inches on center, so a 3-foot-wide staircase needs three stringers, and a set of slightly wider stairs (say 3 feet 6 inches) needs four stringers. The maximum 18-inch spacing presumes treads of 5/4-inch wood decking or 2-by stock.
What size lumber is used for stair stringers?
The stair stringers are essentially the backbone of your staircase. Always use straight, high-quality, pressure-treated 2x12s for stair stringers. If you are planning on resting the stringer on the ground, make sure the wood has .
What is the standard rise and run for deck stairs?
The stair treads should be at least 36 inches wide. Despite these minimum requirements, we recommend that stairs should be at least 48 inches wide so they don’t feel cramped. The maximum allowable stair rise is 7 3/4 inches, and the minimum stair rise is 4 inches.
What is the formula for building steps?
You divide the height by 7 inches; if, say, the floor-to-floor distance is 8 feet, 10 inches (or 106 inches), then you’ll need 15 treads (106 divided by 7 equals 15.14). Next, you divide the height by the number of treads (15 into 106), producing the exact tread height (7.06 inches).
Do you use 2×10 or 2×12 for stair stringers?
It is acceptable and within building code guidelines to use either 2×10 or 2×12 dimensional lumber to create a set of stairs; however, a stair stringer should not be less than 3.5 inches wide at its narrowest point to provide adequate strength for the load the stairs will be supporting.
How long should a 2×12 stringer be?
cut stringers. The two most common cut-stringer defects that I see are overspanning and overcutting. The minimum recommended size for a deck stair stringer is 2×12, which has a maximum recommended unsupported span of 6 feet.
What are the dimensions of a stair stringer?
So, in general, the typical stairway is 36 inches wide. The number of stringers installed at a wood-framed stairway is related to the 36-inch minimum width. If cut stringers are used in the stair construction, then at least three stringers are required. Cut stringers should be spaced no more than 18 inches on center.
Do deck stairs need toe kicks?
The tread (or depth) of your steps should be ten and a half inches. The risers (or toe kick) must be between seven and eight inches high. A handrail is only required if your deck is more than thirty inches off the ground.
Can you use joist hangers for stair stringers?
Use joist hangers to fasten the blocking. Pros: Allows for the use of all types of stair stringer hangers. The top of the stair stringer acts as the first tread instead of being flush with the deck’s surface.
What is the code for deck stairs?
Requirements for Deck Stairs Stair rails on decks should be between 34 inches and 38 inches high, measured vertically from the nose of the tread to the top of the rail. Treads must be at least 10 inches deep, measuring from front to back.
What is the code for outdoor steps?
Exterior Stair Construction The rise of the stairs should be between 125 mm (5”) and 200 mm (8”). This is measured from top of a tread nosing to the top of the next tread nosing or landing. The run should be between 210 mm (8 ¼”) and 355mm (14”). Unit run is measured from face of nosing to face of nosing.
Do deck stair stringers need support?
To help resist both vertical and lateral loads, stringers require proper support and attachment at these bearing points. Without proper support, vertical loads (gravity) can pull the stringers down from their bearing points, while lateral (horizontal) loads can pull the stringers away from their bearing points.
How many stringers do I need for deck stairs?
Deck Stair Basics Deck stairs are typically made from 2 x 12 stringers spaced about 12 to 16 inches apart. They rest on a solid foundation and are attached to the deck with hangers. They have risers (also called toe kicks), treads and railings. The stairs should be at least 36 inches wide.
What is the standard step height for stairs?
Riser Heights In the United States, the step height standard should be between 7 or 7 ¾ inches at the most, and no less than 4 inches. You should follow other measurements if given by local building codes. In Canada, the maximum step riser height is 8 ¼ inches.
How tall is a 4 step Stringer?
Mendocino Forest Products Stair Stringer 4 step Redwood (Common: 48 in. x 12 in.; Actual: 1.5 in. x 11 in.
What is the best wood for stair stringers?
LP SolidStart Laminated Strand Lumber (LSL) and LP SolidStart Laminated Veneer Lumber (LVL) are ideal for Stair Stringers because they surpass traditional lumber products in length, strength and consistency.
How tall is a 5 step Stringer?
Stair Stringer-5 step Redwood (Common: 60 in. x 11 in.; Actual: 1.5 in.
How high is a 2 step Stringer?
Size:2 In. Step stringers are cut for 2″ X 12″ Treads, and have a 7″ Rise.
