Alternating tread stairs

An OSHA-compliant, space-saving solution when a standard stair is not feasible.

BUY ONLINE

The alternating tread stair design

Standard stair
Standard stair

Each foot normally uses only about half of each tread, stepping out and over the unused section.

Ship stair
Ship stair

The unused half tread becomes an obstacle by reducing the usable depth of the tread below.

Alternating tread stair
Alternating tread stair

The unused half tread is removed to provide more tread depth for improved safety and comfort.

ATS Diagram

Stair slope of either 56 or 68 degrees requires a smaller overall footprint than a standard stair

Designed to be used as a stair with users facing the direction of travel when climbing up and down

Code-compliant handrails meet OSHA requirements for fall protection and improve ease of use

Built-in cushioned central stringer protects users and reduces the risk of trips and falls

The alternating tread stair design

Standard stair
Standard stair

Each foot normally uses only about half of each tread, stepping out and over the unused section.

Ship stair
Ship stair

The unused half tread becomes an obstacle by reducing the usable depth of the tread below.

Alternating tread stair
Alternating tread stair

The unused half tread is removed to provide more tread depth for improved safety and comfort.

Alternating tread stair diagram

Stair slope of either 56 or 68 degrees requires a smaller overall footprint than a standard stair

Designed to be used as a stair with users facing the direction of travel when climbing up and down

Code-compliant handrails meet OSHA requirements for fall protection and improve ease of use

Built-in cushioned central stringer protects users and reduces the risk of trips and falls

Types of alternating tread stairs

Types of alternating tread stairs
Carbon steel, powder coat finish

Ideal for indoor use
Standard or custom colors
56 or 68 degree

Carbon steel, galvanized finish

Ideal for outdoor use
Hot dip galvanized finish
56 or 68 degree

Stainless steel, natural finish

Easy to clean
Grade 304 stainless steel
56 or 68 degree

Aluminum, natural finish

Lightweight
Resists corrosion
68 degree only

Types of alternating tread stairs

Types of alternating tread stairs
Carbon steel, powder coat finish

Ideal for indoor use
Standard or custom colors
56 or 68 degree

Carbon steel, galvanized finish

Ideal for outdoor use
Hot dip galvanized finish
56 or 68 degree

Stainless steel, natural finish

Easy to clean
Grade 304 stainless steel
56 or 68 degree

Aluminum, natural finish

Lightweight
Resists corrosion
68 degree only

Types of alternating tread stairs

Types of alternating tread stairs
Carbon steel, powder coat finish

Ideal for indoor use
Standard or custom colors
56 or 68 degree

Carbon steel, galvanized finish

Ideal for outdoor use
Hot dip galvanized finish
56 or 68 degree

Stainless steel, natural finish

Easy to clean
Grade 304 stainless steel
56 or 68 degree

Aluminum, natural finish

Lightweight
Resists corrosion
68 degree only

Types of alternating tread stairs

Types of alternating tread stairs
Carbon steel, powder coat finish

Ideal for indoor use
Standard or custom colors
56 or 68 degree

Carbon steel, galvanized finish

Ideal for outdoor use
Hot dip galvanized finish
56 or 68 degree

Stainless steel, natural finish

Easy to clean
Grade 304 stainless steel
56 or 68 degree


Aluminum, natural finish

Lightweight
Resists corrosion
68 degree only

Blog posts about alternating tread stairs


Space Saving Stair: Applications for the Alternating Tread Stair

Alternating tread stairs are the safest and most comfortable space saving stairs for industrial and commercial applications. To maximize floor space, designers need to know when and where to use alternating tread stairs to get the most benefit. Steep Angle Stair Saves Space As a steep stair solution, alternating tread stairs save a significant amount of floor space vs a standard stair design. The...Read more

Ship Ladder Stairs: Stairs vs ladders

Ships ladders, ship stairs, ship ladder stairs, alternating tread stairs, fixed ladders are all terms that can get confused and sometimes used interchangeably. How do these devices differ from each other? Let's look at how OSHA defines stairways, alternating tread stairs, ship stairs, ship ladders, and fixed ladders to understand the difference. OSHA Stair and Ladder Definitions OSHA Section...Read more

Stair Codes: A Complete Guide

Stair codes are complex, and most people don't have the time to learn how all the codes relate to each other. We created this guide to help stair designers navigate through the complexity. This guide will teach you about: All the different stair codes and stair regulatory agencies How the different stair codes and standards relate to each other What codes apply for each application Stair...Read more

Roof Ladders and Roof Stairs: How to choose the right device

With so many different options and applications for roof ladders and roof stairs, it can be difficult to determine what is the best device for each roof application. Some of the options to access roofs are stairways, roof ladders, fixed ladders or permanent ladders, folding ladders, retractable ladders, ships ladders, and alternating tread stairs. Understanding roof access code...Read more

OSHA and IBC Ships Ladders: Definitions, Design, and Safety

At Lapeyre Stair, we often get asked if we manufacture ship stairs or ships ladders. The short answer is no. But what are ships ladders and why don't we manufacture them? Ship stairs and ship ladders are addressed by both OSHA and IBC. OSHA uses the terms ship stair and ship ladder interchangeably while IBC uses the term ships ladder. There is one key difference between a ships ladder and a ship...Read more

Alternating Tread Stair Safety: What to consider for your next project

Alternating Tread Stairs provide the same space saving benefit but more than twice the usable tread depth as a ships ladder or ship stair. On its own, this is a great advantage. More tread depth means a larger stepping surface and greater stability for the user. But how does this actually translate to improved safety and comfort? A team at the Virginia Tech Human Factors Engineering Laboratory...Read more

How does stair tread depth affect safety?

Studies have shown stair tread depth to be a risk factor of stairways. Understanding the safety of tread depth and the IBC and OSHA requirements will help stair designers ensure they choose the right stair design for optimal safety and ergonomics. Tread Depth Definition Before getting into the requirements, let's start by defining stair tread depth. OSHA states that "tread depth is measured...Read more

The Lapeyre Stair Blog

Keep current on stair codes, industry standards, safety, and best practices.

Subscribe today

Ready to take the next step?

Contact us