Skip to Product Info
    • Alumistair 12 Step Aluminum Stairs
    • Alumistair 12 Step Aluminum Stairs
    • Alumistair 12 Step Aluminum Stairs

    Alumistair 12 Step Aluminum Stairs

    Type: Dock Steps
    Regular Price $2,984.80

    Request Shipping Quote: 1.813.677.4000

    Item # AS12
    • Alumistair 12 Step Aluminum Stairs (SKU: AS12 / 1433)
    • Corrosion-resistant marine-grade aluminum
    • Standard tread width: 29¼" (Wide: 34")
    • Overall width: 34½" (Wide: 36")
    • Riser height: 8½" — Non-skid 7" tread depth
    • Ships LTL freight — 2–4 week lead time (built to order)

    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
    Alumistair Aluminum Stairway provides a lightweight and strong stairway solution for docks, seawalls, and transitions from deck to deck or deck to waterfront access. Alumistair aluminum marine stairs only take 2 people to carry and install. Durable, non-rotting design eliminates time-consuming maintenance and delivers safe, long-term waterfront access. Standard Step Version: 29-1/4" tread width, 34-1/2" outside width. Wide Step Version AS12: 34" tread width, 36" outside width. Key features include non-skid tread depth of 7", riser height 8-1/2", 1-1/4" OD round tube handrails with mid-rail for added safety, includes top-side mounting stair bracket, climb angle 45° (adjustable range 35°–55° available, contact support for details).
    Additional Info

    Alumistair Aluminum Stairway provides a lightweight and strong stairway solution for docks, seawalls, and deck transitions to waterfront, built from durable, corrosion-resistant marine-grade aluminum.

    Item #:AS12
    Stair Steps:12
    Material:Marine Grade Aluminum
    Finish:Corrosion-Resistant Aluminum
    Tread Depth:7"
    Riser Height:8-1/2"
    Handrail Size:1-1/4" OD Round Tube w/ Mid-Rail
    Mount Type:Top-side Mounting Bracket Included
    Ship Method:LTL Freight Only
    Lead Time:2-4 Weeks (Built to order in USA)
    A (Rise):102"
    B (Run):102"
    C (Length):144"
    D (Riser):8-1/2"
    E (Overall Width):31-1/4" (Standard) / 36" (Wide)
    F (Inside/Tread Width):29-1/4" (Standard) / 34" (Wide)

    *All dimensions and weights are approximate
    Shipping & Returns

    Most in-stock items ship within 1 business day from our Florida warehouse. Transit times vary by location — refer to our Shipping & Returns page for details.

    We accept returns within 30 days of purchase. Items must be unused and in original condition. Please contact sales@dockbuilders.com for return authorization or assistance.

    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

    • Plan & Design

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

    • Select Components

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

    • Ship & Build

      We ship your supplies with secure, efficient delivery.