What is the Difference between OSHA and IBC Compliant Stairs?
The two types of stairs are differentiated by a range of factors all related to their construction and measurement. The below table simply depicts these factors:
|Risers & Tread||8″ open riser
a 9.5″ tread
|7″ closed riser, max 4″ open gap. 11″ tread|
|Stair Width||A minimum 22″ wide stair
|A minimum 44″ wide in most cases
(36″ wide areas served by less than 50 people)
|Railings & Guardrail||OSHA requires railings on open sides of stairwells and a handrail on at least on the side, preferably the right side descending at 42″ high.||IBC Stairs require guardrails of 42″ high and handrails of 34″ high on both sides of the stairwell.
(vertical members in handrails)
|Space between balusters should be no more than 19″ (48 cm) apart||Space between balusters should be no more than 4″ apart|
|Landings||Both OSHA and IBC require landings at the top and bottom of the stairs, although IBC landings are larger, typically 4′ square.||IBC also requires an intermediate landing on stairwells for stairwells over 12′ high, as well as handrail extensions at the bottom landing.|
*This chart is for general reference. Regulations do change.
Risers & Tread – OSHA stair tread requirements 90 | IBC stair width 50 | OSHA stair maximum riser height 70 | OSHA stair riser height 70
Stair Width – OSHA stair tread requirements 90
Railings and Guardrails – OSHA handrail requirements 390 | IBC handrail 320
Balusters – OSHA 1910.29(b)(2)(iii)