Prefabricated Stair Systems | Prefab Stairs | Prefabricated Stairs

All Panel Built prefabricated stair systems, handrails and components are engineered, fabricated and powder coat painted at our plant for a lasting finish and fast delivery. Each set of prefabricated stairs is manufactured to your specification allowing for fully-custom stair sizes, heights, layouts, widths, treads, and specialty metal handrail that meets OSHA and/or IBC codes.

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Differences Between IBC and OSHA stair codes
Horizontal Run
Collapse IBC Stairs have a horizontal run that is approximately 1.5 times the deck height, not including landings or handrail extenders, so a 10’ high mezzanine deck would have an approximate 15’long stairwell.
Risers & Tread
Collapse IBC Stairs typically have a 7” closed riser and an 11” tread.
Stair Width
Collapse IBC Stairs are minimum 36” wide in most cases.
Railings and Guardrail
Collapse IBC Stairs require rails of 42” high and handrails of 34” high on both sides of the stairwell.
Collapse IBC also requires an intermediate landing on stairwells for stairwells over 12’ high, as well as handrail extensions at the bottom landing.
Horizontal Run
Collapse With OSHA Stairs the horizontal run and the length of the stairwell, is approximately equal to the height of the deck. For instance if the mezzanine deck height is 10’, the stairwell is 10’ long.
Risers & Tread
Collapse OSHA Stairs typically have an 8” closed riser and an 9” tread.
Stair Width
Collapse OSHA Stairs are minimum 22”wide.
Railings and Guardrail Collapse
OSHA requires railings on open sides of stairwells and a handrail on at least on side, preferably the right side descending at 34” high.
Collapse Both OSHA and IBC require landings at the top and bottom of the stairs, although IBC landings are larger, typically 4’ square.
Prefabricated Stairs Installation Guide