You should shave a slight angle into the bottom of each rise form board, excluding the bottom riser form board.In this case, your stringer will follow the entire run and rise of your stairs. If you are pouring concrete steps that form a right angle (L-shape), your stringer forms will not need to be cut on an angle.The ground-oriented side of your stringer forms should be cut to meet the pitch line (angle) of your stair, and the top should be cut in a zigzag fashion to follow the rise and depth of each tread (step). Your form should exclude the top and bottom of the entire stair.Using the dimensions you've taken for your staircase, cut pieces of scrap wood or low-grade lumber so you have a board for the rise for each step and two boards for the stringers (one for each side of your stair form). You should be able to find these through a general Internet search for a "stair calculator." These calculators will help you determine the exact specifications of your steps, including the number of treads, the height of each riser, the stringer length, the pitch line, and so on.Ĭut the pieces for your form. There are many online sites that offer simple step calculators to simplify this process.Otherwise, you will need an equal number of treads and risers. If your stairs are built so the topmost tread is a step below the level/floor you are building up to, the number of treads you need will be 1 less than the number of risers.If this number comes out as a decimal, you must round up to the next whole number.
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The building code in some states sets the maximum riser height at 8.25" (21 cm), but you should be sure to check your local building code to prevent building stairs that violate state code or local ordinances. Standard risers are between 6 to 8 in (15 to 20 cm). You can do this by finding the rise (total height from the bottom level to the top level) of your stairs and dividing that number by the riser height (the height of each step). Calculate the number of stairs you will need.
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