Alternating Tread Stairs (Steel Industrial Access Stairs)

Lapeyre Stair’s Alternating Tread Stairs (ATS) are a patented, space-saving solution that replaces vertical and caged ladders with a safer, forward-facing stair design. Engineered in steel with multiple finish options, the ATS meets OSHA and IBC code requirements and provides reliable access in compact areas such as roof hatches, mezzanines, platforms, and equipment enclosures. Available in customizable heights and quick-ship configurations, Lapeyre’s ATS gives architects, engineers, and contractors a code-compliant, ready-to-spec alternative to ladders and ship stairs.

Applications
The ATS is ideal for replacing vertical or caged ladders where forward-facing access improves safety and usability:

• Roof access hatches
• Mezzanine platforms
• Data centers and server rooms
• Tanks and silos
• Manufacturing and distribution facilities

Comparison: ATS vs. Ladders/Ship Stairs

• Vertical Ladder – Space-saving, but high fall risk and difficult to carry tools.
• Ship Stair – Safer than a ladder, but requires more horizontal space.
• Alternating Tread Stair – Combines space efficiency with forward-facing safety, fully code-compliant.

Differentiators

• Patented Design – Lapeyre Stair pioneered the ATS and continues to innovate.
• Code Compliance – Meets OSHA and IBC-Industrial requirements where ladders fall short.
• Customization – Heights are adjustable in 1/8" increments for a precise fit.
• Quick Ship Options – Standard configurations available for fast delivery.
• Lapeyre Legacy – Decades of innovation in industrial safety and access solutions.

Available Downloads

• Revit Families (.rfa)
  • ATS – 8 ft vertical height
  • ATS – 12 ft vertical height
  • ATS – 16 ft vertical height
• CAD / DWG Files
  • Plan view
  • Section detail
  • Guardrail attachment
• Specification Sheets (PDF)
• Guide Specs (Word / CSI Format)
  • Section 055000 – Metal Stairs