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Know the maximum allowed riser height to determine the rise and run of stairs. For a standard straight run of stairs in a residence, the maximum stair riser height is 7 3/4 inches, and the minimum tread depth is 10 inches. The risers is the vertical part of a step, and a tread is the horizontal part that you walk on. To calculate how many risers are needed, measure the floor-to-floor height in inches, then divide the height by 7 3/4. The result will likely be a fraction, so always round up.
Once the number of treads is determined, the exact location the stairs will land can be discovered. Multiply the number of treads by their depth (minimum 10 inches) and measure out from the deck to where the stairs will land. Now determine the height from this point to the deck and adjust the rises uniformly as necessary. Once the riser height and tread depth is determined, you can begin building your stairs. Open risers are permitted by code with a catch because they may not be large enough to permit the passage of a 4â sphere the same as rail infill rules. In most cases it looks nicer and is just plain easier to close the risers.