The Rise The Going and The Pitch Building regulations stairs All the steps of a staircase should have the same rise;To calculate the run of the stairs, simply multiply the tread dimension (ensure this doesn't include the nose see below) by the number of steps To calculate the rise of the stairs, multiply the rise dimension by the number of steps Or, to work out how many steps you need, take your ceiling height and divide by let's say 16 to start withBuilding codes limit variation to 3/8" 10 mm The underside of risers should be sloped or have a 60° angle minimum between nosings and the
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