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Common Home Systems and How They Work.

A Few Facts ABout Steps

 

You might ask, why are steps included here ?  Steps are all around us and provide us means of getting up to one place and down to another.  Most of us travel them everyday, and for some of us - not to often. This section is geared towards the steps, handrails and landings you find in the average residential home.

 

Shown here are a few pictures and codes related to a residential house.  Pictures are provided by Stairway Manufactures Association (SMA) and interpreted by the International Residential Code (IRC).

 

Since steps are all around us, it's important they be built correctly and do not pose any physical harm to the public or to the home owner. For this reason, the SMA performed 20 Case Studies on the construction of steps, handrails and landings that changed the stair industry.  Although there are a few different variations in codes specs from different organizations - as far as specified heights / dimensions, etc, the stairs should be built in a uniform fashion to the particular staircase in question.

 

The codes you see below refer to the International Residential Code and should be used as a general guideline only.  Many states, provinces and city's as well, have their own guidelines to follow, ... often refered to as the Authority Having Jurisdiction (AHJ). The AHJ is the final decision-making authority for fire-protection systems, building features and suitability for occupancy.


STAIRWAYS


Stairways shall not be less than 36 inches (914 mm) in clear width at all points above the permitted handrail height and below the required headroom height. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


HANDRAILS

 

Handrails shall not project more than 4.5 inches (114 mm) on either side of the stairway and the minimum clear width of the stairway at and below the handrail height.

 

 

 

 

 

 

 

 

 

HEADROOM


The minimum headroom in all parts of the stairway shall not be less than 6 feet, 8 inches (2036 mm)
measured vertically from the sloped plane adjoining the tread nosing or from the floor surface
of the landing or platform.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


STAIR TREADS and RISERS

 

Tread Depth.

The minimum tread depth shall be 10 inches (254 mm). The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread’s leading edge.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tread Allowance

The greatest tread depth within any flight of stairs shall not exceed the smallest by more than 3⁄8 inch (9.5 mm).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Riser Height.

The maximum riser height shall be 7 3⁄4 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). 

 


 

 

 

 

 

 

 

 

 

 

Riser Allowance

The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3⁄8 inch (9.5mm).