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Alpha Metals is a trusted provider of underdecking solutions for homeowners and businesses looking to maximize their outdoor space. Our underdecking systems are designed to create a dry and comfortable area underneath a raised deck, providing protection from the elements.

Applications and Benefits of Alpha Metals Underdecking:

  • Residential Decks: Create additional usable space beneath your residential deck while adding an element of design.
  • Commercial Outdoor Areas: Enhance the functionality and appeal of commercial outdoor spaces with our durable underdecking solutions.
  • Weather Protection: Shield your outdoor spaces from rain, snow, and other weather elements, ensuring year-round usability.
  • Aesthetic Enhancement: Elevate the visual appeal of your property by adding a stylish and finished look to the underside of your deck.
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Why Choose Alpha Metals for Underdecking:

innovative Design

Our underdecking solutions go beyond functionality, incorporating innovative design elements to enhance the aesthetics of your outdoor spaces.


Tailor your underdecking to suit your style and project requirements. Choose from a variety of colors and profiles to create a seamless and personalized look.


Crafted with longevity in mind, our underdecking options are engineered to withstand the elements, ensuring a durable and reliable solution for years to come.

Available Colors

Environmentally Smart Colors — Designed Energy Efficient

Ash Gray


Charcoal Gray

Colonial Red

Dark Bronze

Dove Gray


Hartford Green

Hemlock Green

Mansard Brown

Matte Black

Medium Bronze

Patina Green

Regal Blue

Regal Red

Regal White


Sierra Tan

Slate Blue

Slate Gray

Solar White

Stone White

Surrey Beige

Terra Cotta

Metallic Colors




Pre-Weathered GALVALUME®

Weathered Colors




Non-Painted Colors

Acrylic-Coated Galvalume®


Colors shown are matched as accurately as possible, but may vary slightly from finished product. These rich and vibrant colors are produced with either Kynar 500® or Hylar 5000® resins, which provide superior color retention and allow Sheffield Metals to offer non-prorated coating warranties for most applications. Coating warranty varies for Regal Red, Matte Black, Copper, Champagne, Silver, and Pre-Weathered Galvalume. Steelscape’s Vintage carries a 20 year Finish Warranty. Please contact your representative for more information.

Galvalume® is a registered trademark of BIEC International Inc. l Hylar 5000® is a registered trademark of Solvay Solexis, Inc. l Kynar 500® is a registered trademark belonging to Arkema Inc. Cor-Ten AZP® is a registered trademark and the USS in Circle, Weathered Metal SeriesTM, Galv-TenTM, and Copper-TenTM are trademarks of United States Steel Corporation. All trademarks are used under license of the United States Steel Corporation.