How far should stair stringers be apart?
Stringers should be spaced no more than 36 inches apart from each other for maximum stair support, according to the International Association of Certified Home Inspectors. However, local residential codes may vary slightly, so check the building codes before building a staircase.
How far can 2×12 stair stringers span?
6 feet
A 2×12 stringer has a maximum unsupported span of 6 feet. These stairs (7) are likely to deflect and cause the stringers to either pull loose from the framing or shear along the grain.
How far can a stair stringer span?
Because of this, you should never space your stair stringers more than 16” on center. This means you will need to install a minimum of four stringers on any stairway wider than 36”. Always check the maximum span for your decking material as it applies to stair treads.
How far do steps need be apart?
A standard number of treads in a stair between first and second floors is 14. One hundred-five divided by 14 equals 7 1/2 . That means the distance from the top of each step to the top of the next step will be 7 1/2 inches. With a riser height of 7 1/2 inches, tread width (run) should be at least 9 inches.
How many stringers do I need for 4 foot wide stairs?
If the stairway is wider than 36 inches, four stringers should be installed. If the stairs are wider than 36 inches (914 mm), a combination of cut and solid stringers can be used, but the maximum spacing between the stringers should be 18 inches (457 mm) on center.
What size timber should I use for stair stringers?
For stringers: 300 x 50 mm DAR/dressed-all-round selected native hardwoods, selected plantation pine, selected to provide relatively straight grained, clear pieces. For cleats: 75 x 38 mm DAR, cut to length to suit width of treads (refer to item No. 1 0).
How long can stringers be without support?
Solid stringers seem to be able to get to about 13 feet without support.
How far should a step overhang?
Stairs must have an overhang between 3/4″ to 1-1/4” to increase the depth of the step, making it better for descent while maintaining a clear 10-inch going for the ascent. Treads that are 11-inches deep or greater do not require an overhang.
How do you calculate stair stringers?
Choose a stair rise somewhere between 7 and 7-1/2 inches. Take your total height divided by that stair rise number. This will almost always give you a long decimal number. Round to the nearest whole number – this will be the number of steps you will have in your staircase.