Each flight must have no more than 18 or less than

**2 risers**. A flight of stairs is defined as a constant series of risers including winders that is not interrupted by a landing.Also question is, what is the minimum height of a stair riser?

All steps on a flight of stairs shall have uniform riser heights and uniform tread depth. Risers shall be

**4 inches**(100 mm) high minimum and**7 inches**(**180 mm**) maximum. Treads shall be**11 inches**(**280 mm**) deep minimum, measured from riser to riser.What is the maximum riser height for stairs?

The maximum riser height shall be

**73/4 inches**(**196 mm**). The riser shall be measured vertically between leading edges of the adjacent treads. The greatest riser height within any flight of stairs shall not exceed the smallest by more than**3/8 inch**(**9.5 mm**). R311.7.4.2 Tread depth.How tall should steps be on a deck?

So, if your steps are 10 inches deep,

**8 inches**high is the optimum riser height. For oversized steps, the depth should be increased, with the height of each step being reduced. If the tread is**12 inches**deep, the riser should be close to**6 inches**. The minimum height for any step should be at least**4 inches**.