Skip to Product Info
    • Alumistair 18 Step Aluminum Stairs – Wide Step (36
    SKU: AS18-36

    Alumistair 18 Step Aluminum Stairs – Wide Step (36")

    Regular Price $4,071.00
    Shipping calculated at checkout.
    • Item # AS18-36
    • 18-step aluminum stairway for dock, seawall, or deck access
    • Wide step configuration for increased stability and comfort
    • Corrosion-resistant aluminum construction for marine use
    • Non-skid stair treads for secure footing
    • Includes top-side mounting stair bracket

    Typically Ships in 2 to 4 Weeks

    Payment & Security

    Your payment is secure. We don’t store or see your card details.

    • Amazon
    • American Express
    • Apple Pay
    • Diners Club
    • Discover
    • Google Pay
    • Mastercard
    • PayPal
    • Shop Pay
    • Visa
    Description
    The AS18-36 aluminum stairs provide a durable and stable access solution for dock-to-water, seawall-to-shore, deck-to-deck, or deck-to-waterfront applications. This wide step configuration increases tread width and overall stair width, offering enhanced comfort and stability while maintaining a lightweight aluminum design. Constructed from corrosion-resistant marine-grade aluminum, the AS18-36 is built for long-term performance with minimal maintenance. Features include non-skid stair treads, consistent riser height for safe climbing, and round tube handrails with a mid-rail for added safety. A top-side mounting stair bracket is included for secure installation.


    Compare every style in our dock ladders range to find the right fit for your dock.
    Additional Info
    Item #:AS18-36
    Material:Marine Grade Aluminum
    Steps:18
    Step Width (Tread):36"
    Overall Width:36"
    Tread Depth:7"
    Riser Height:8½"
    Handrails:1-1/4" OD round tube with mid-rail
    Mounting:Top-side mounting bracket included
    PDF Guides
    AlumiStair_Stair_Assembly Download
    AlumiStair_Stair_Bracket_Diagram Download
    Docks aerial shot bay city

    Why Choose Dockbuilders?

    With nearly 30 years of experience, Dock Builders Supply delivers dependable marine construction materials for projects of all sizes. Our products are selected with precision for durability, performance, and real-world dock applications.

    Backed by a knowledgeable team and supported with detailed estimates and drawings, we help you plan with clarity and build with confidence — from residential docks to large-scale marina installations.

    How It Works

    • Slidemoor systems

      Plan & Design

      Share your dock goals, and we’ll create a custom layout and materials list.

    • Dock Builders Supply 40' to 65' Boat Length Heavy Duty Take-A-Part Mooring Whips - mooring whip

      Select Components

      Choose durable, marine-grade parts tailored to your design.

    • Dock over lake aluminum

      Ship & Build

      We ship your supplies with secure, efficient delivery.