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.
What size lumber should I use for stair stringers?
Stringers should always be cut from 2x12s. Notching smaller stock doesn’t leave enough wood to safely carry the loads of a stair. When ordering stringers, allow about 14 inches of stringer length for each step. Look for straight stock with as few knots as possible.
Do I need 2 or 3 stair stringers?
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. For example, a 36-inch-wide stairway should have three stringers. If the stairway is wider than 36 inches, four stringers should be installed.
How do you calculate stair stringers?
Take the total height of your stairs divided by the number of steps. This will give you the exact height you should cut each rise in your stair stringer boards.
What wood is used for stair risers?
The top choices of wood for risers would be white oak, poplar. maple or pine. All of these woods have their own properties that make them suitable for making stair risers.
Do stair stringers need support?
Yes, the stringers need to be supported along their length, but they can span a few feet too, depending on 1) the width of the stairs, 2) the number of stringers, and 3) size of riser board. 1) The wider the stair the more load will be transferred to the stringers.
How many steps is 4 foot rise?
Use your minimum riser height; if you roundup, this would push the riser under the minimum limit. In Edmonton, the minimum is five inches. Nine rises (round down) with eight steps (minus one). A four-foot high deck can have a range between 6 and 8 steps.
How many stringers do I need for a 36 inch wide staircase?
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. Some composite materials and lower-grade 5/4 wood decking may require you to reduce the stringer spacing to 10” on center.
What is the maximum distance between stair stringers?
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 apart should stringers be on deck stairs?
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 minimum height for a stair riser?
1009.4. 2 Riser height and tread depth. Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. The riser height shall be measured vertically between the leading edges of adjacent treads.
What is the normal rise and run for stairs?
What is code for rise and run of stairs? The 2018 IBC building code for rise and run of stairs is a maximum 7″ rise and minimum 11″ run (tread depth). The OSHA standard for rise and run of stairs is maximum 9.5″ rise and minimum 9.5″ run (tread depth). The IBC maximum rise of a single stair flight is 12.
How long of a 2×12 do I need for stairs?
How to Use the EZ Stair Calculator. We suggest 10.5″ for 2×12 or 2 – 2×6 Treads. Treads may be cut to suit other widths.
How many steps is 8 foot rise?
Divide the vertical distance by typical riser height, normally 8-inches -or your preferred riser height. For example, a total rise of 8-feet, 5 -inches (102-inches) divided by 8-inches would work out to 12.75 steps.
Can I use plywood for stair risers?
Risers do not have to be made of any thick material, as they provide only minimal structural support. Therefore, they can be made of ½” thick plywood or OSB . Those are normally installed first, with the treads following.
Do you nail or screw stair treads?
Don’t fasten treads and or risers with only nails or staples. The adhesive is much more important than the fasteners. There will be times when fastening may be limited, so a good adhesive is critical. Don’t use the stringer as a level for the treads.
Do you install stair treads or risers first?
When installing stairs, install the riser first, and then the tread. Start at the bottom of the stairs and work your way up, alternating risers and treads. The back of each tread will sit flush against the riser.
