Stair Tread Nosing Code

Stair tread dimensions measaurements step construction details code specifications.

Stair tread nosing code.

Stair tread or landing nose or nosing definitions codes definition of stair tread nose. Risers shall be solid and vertical or. Sketches photographs and examples of defects used in inspecting the step design on indoor or outdoor stairs and their treads including the requirements for a projecting stair tread nose and the tread nose shape and dimensions. U progress dana policy stair treads international building code stair treads and risers doc 06 23 2014 1009 3 3 profile.

The nosing on treads believe it or not has a code minimum and maximum of how far the nosing projects over the next stair. The section of the tread that overhangs the riser below. Stair tread nose the greatest stair tread nosing projection shall not exceed the smallest nosing projection by more than 3 8 inch 9 5 mm between two stories including the nosing at the level of floors and landings. Nosings are required to overhang a minimum of in.

A nosing is not required where the tread depth is a minimum of 11 inches 279 mm. So since the minimum tread size is 10 a nosing will extend the tread depth to between 10 3 4 and 11 1 4. Beveling of nosings shall not exceed 0 5 inch 12 7 mm. This document provides building code specifications for stair treads.

To a maximum of 1 in. Handrail height to be placed a minimum 34 inches to 38 inches. Also the maximum nosing radius cannot exceed 9 16 of an inch. Ibc 1002 14a.

Handrail graspability to be either type i or ii with a minimum 1 1 2 inch clearance from a wall. Width refers to the length of risers and treads from side to side. Minimum 10 inch stair tread depth with nosing or minimum 11 inches with no nosing. The leading edge of treads of stairs and of landings at the top of stairway flights.

For code requirements the minimum staircase width is the horizontal dimension between the sidewalls of a staircase measured above the handrail s. Beveling of nosings shall not exceed 1 2 inch 12 7 mm.