Composite floor deck and roof deck systems for multi-story projects

Multi-story Systems

Three ways to optimize your multi-story, multi-family construction projects

3 multi-story-systems, Composite joist and deck, Deep-Dek®, and Versa-Dek®
Long-span composite systems meet the demands of mid-rise and high-rise projects

Multi-story construction requires careful consideration of multiple factors, including total floor depth; loads; fire, vibration and acoustic ratings; and overall aesthetics. We offer three long-span composite floor systems that address these requirements and lead to overall project success.

Each of our systems puts a vast array of multi-story design possibilities within your reach. Combining the benefits of steel and concrete, these systems optimize the cost and performance of your mid-rise or high-rise project. They achieve clear spans up to 60 feet and beyond uninterrupted by support columns. They can weigh up to 40% less than comparably utilized cast-in-place (CIP) concrete floors. They minimize floor depth and optimize floor-to-floor height. They reduce project costs and accelerate construction timelines.

Compare your options
Composite joists and deck

Composite joists (CJ-Series) and deck combine to create the longest open-spanning system available, reaching up to 60 feet and beyond. The strength of this system comes from shear studs applied to the steel joist in the field that become embedded in hardened concrete, creating a load-bearing system that deflects as a single unit. This building method is stronger, stiffer, lighter and less costly than other structural steel frame approaches in multi-story construction.

Deep-Dek® Composite

Ideal for multi-story structures demanding shallow floor depths, high load capacity and stringent serviceability demands, Deep-Dek® Composite uses patented side-lap connections to achieve its composite bond. Its span-to-depth ratios are equal to traditional cast-in-place concrete and hollow-core plank yet weigh less than equivalent concrete floors and install faster. Available in a deep-fluted appearance or a smooth surface with thin structural ribbing, Deep-Dek® Composite clear spans can reach up to 36 feet.

Versa-Dek® Composite

Versa-Dek® Composite dovetail deck boasts the thinnest total floor depth possible in multi-story projects. When combined with a concrete slab, its 2-inch and 3.5-inch profiles create floor depths as thin as 4 inches, reducing overall story height while maximizing floor-to-ceiling height. Versa-Dek® Composite clear spans can reach up to 28 feet while requiring up to 40% less concrete than concrete plank. Left exposed, its telltale dovetail shape provides a lineal plank ceiling look suitable for office, retail and academic spaces.

New Millennium can provide design assistance and help you choose the ideal system for your project. Contact one of our specialists to get started.

Cover of Long-span Composite Systems Brochure
Long-span composite systems brochure

Find out more about our long-span composite floor systems for mid-rise and high-rise multi-story construction.

Building a better steel experience