Prefabricated Steel Stair System

PART 1 – GENERAL

1.1 SUMMARY

Work includes furnishing and installing a complete prefabricated steel stairway system supported on concrete foundation slabs, including stringers, treads, risers, landings, handrails, guardrails, anchors, and all required hardware.

1.2 RELATED SECTIONS

Removals – Section 02000

1.3 REFERENCES

ASTM A36 – Carbon Structural Steel
ASTM A572 – HighStrength LowAlloy Steel
ASTM A123 – HotDip Galvanized Coatings
ASTM F1554 – Anchor Bolts
AWS D1.1 – Structural Welding Code
IBC – International Building Code
OSHA 1910/1926 – Stair and Railing Requirements

1.4 SUBMITTALS

Shop Drawings from steel stair system manufacturer that show all system components, including stair and handrail geometry, stringer profiles, tread details, upper landing framing connection, anchor bolt layout, post supports, and interface with concrete slabs. Contractor to provide stair manufacturer stamped drawings and calculations by a registered Professional Engineer. Product Data: Steel grades, coatings, anchors, grout.
Welding Certificates: AWSqualified welders.
Installation Plan: Lifting, rigging, and sequencing.
Quality Assurance: Inspection reports, mill certificates. The contractor shall submit manufacturers’ shop drawings and structural calculations for all components used in the construction of this Steel Stair System. The drawings and structural calculations shall be stamped by a Professional Engineer.

1.5 QUALITY ASSURANCE

Fabricator shall have minimum 5 years’ documented experience producing prefabricated steel stairs. Welding shall comply with AWS D1.1.
Field measurements must be verified prior to fabrication.

1.6 DELIVERY, STORAGE, AND HANDLING

Protect stair components from deformation, corrosion, and coating damage. Store off the ground with adequate ventilation.

1.7 COORDINATION

Coordinate anchor bolt placement with concrete contractor. Confirm slab elevations and bearing surfaces before installation.

PART 2 – PRODUCTS

2.1 MATERIALS

Structural Steel: ASTM A36 or A572 Grade 50.
Treads: 11 3/4" black bar grating treads with 3” toe kick and 1 3/16” bearing bar size spaced on 11/16” Centers with 1/2” maximum openings meeting ADA Guidelines. Stringers: Channel or plate stringers per design.
Top Landing: Steel deck plate connected to existing wood framing. Handrails/Guardrails: Factory welded 1-1/2” x 11 Gauge square steel tubing meeting IBC and OSHA load requirements. Anchor Bolts: ASTM F1554, galvanized for exterior use if part of Manufacturers Standard Design.