Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. Stair tread depths shall be 11 inches (279 mm) minimum. The riser height shall be measured vertically between the leading edges of adjacent treads.
In 2018, the International Residential Code finally addressed tiny houses in Appendix Q and gave clarity on how to address things like stairs in tiny homes. Headroom for stairways accessing a loft shall not be less than 6 feet 2 inches. Risers shall not be less than 7 inches and not more than 12 inches in height.
Length of flight Stairs with more than 36 risers in consecutive flights should have at least one change in direction between flights. For buildings other than dwellings, the maximum number of risers between landings should be 16 for utility stairs and 12 for general access stairs . There should not be any single steps .
(1) The rise of every step in a stairway shall be not less than 4 inches nor greater than 7 1/2 inches. (2) The run shall not be less than 10 inches as measured horizontally between the vertical planes of the furthermost projection of adjacent treads.
If your home has three or fewer steps , there’s no need to install a handrail . However, homes having four or more stairs must have a rail mounted on at least one side if the stairway is less than 44 inches wide. If one edge of the stairwell is open, that’s where the handrail must be.
(1) Stairways less than 44 inches in width may have one handrail or stair railing except that such stairways open on one or both sides shall have stair railings provided on the open side or sides. (2) Stairways having less than four risers need not have handrails or stair railings .
Do work at least one riser ahead before installing treads . Installing two risers is one way to ensure proper strength and performance. The important thing is to remember to install riser , tread , riser , tread or install the risers first . Do use both adhesives and fasteners when possible.
Having the stairway face the front door is undesirable for a much more common-sense reason. When you enter a home and the stairway is located directly across from the front door , your attention is pulled straight upstairs, exposing the most private area of the home to the public area of the home.
You can put a door at the top of an interior staircase . For safety reasons, if the door swings out over the stairs , you must have a landing at the top of the stairs . If the door swings into the room or hallway at the top of the stairs , a landing is not required.
Does the landing count as a step ? Yes it does . Remember that when counting stairs, you are counting how many times you have to lift your foot. If you have to lift your foot to get onto the landing , then it counts as a step .
The general rule (in the US) is 7-11 (a 7 inch rise and 11 inch run) (17.78cm-27.94cm). More exactly, no more than 7 3/4 inches (19.7cm) for the riser (vertical) and a minimum of 10 inches (25.4cm) for the tread (horizontal or step ). You can find some more information here as well on other stair -related dimensions.
Per the latest edition of the 2012 International Residential Code (IRC), the maximum allowed difference in riser height is 3/8″. (This means that the difference in height between the tallest and the shortest riser on your stairs can be no more than 3/8″.)
The greatest tread depth within a flight of stairs cannot be more than 3/8 inch larger than the smallest tread depth. Nosings must project at least 3/4 inch and no more than 1 1/ 4 inches beyond the riser below. The largest nosing projection cannot be more than 3/8 inch greater than the smallest nosing projection.