HVAC Roof Dunnage & Steel Catwalks

Steel Masters NYC custom fabricates and installs structural steel HVAC roof dunnage, mechanical equipment bases, steel catwalks, and raised platforms for commercial buildings throughout New York City. Every dunnage frame is engineered to your rooftop layout, HVAC unit weight, and mounting requirements — fabricated in our Brooklyn shop and installed by our own crew.

Roof dunnage is a critical structural component for any commercial rooftop HVAC installation. Without properly engineered steel supports, HVAC units and mechanical equipment cause roof membrane damage, water infiltration, and structural problems over time. Steel Masters Inc. has been fabricating custom roof dunnage and mechanical catwalks for NYC commercial buildings since 1972, serving general contractors, HVAC contractors, building owners, and property managers across all five boroughs, Long Island, and Westchester.

Roof Dunnage & Catwalks — Project Photos

Roof Dunnage and Catwalk Types We Fabricate

HVAC unit bases and equipment frames are the most common request — structural steel frames supporting rooftop HVAC units, condensers, cooling towers, and air handling units, mounted through roof structural beams or on surface-mounted posts. Floating and moment-connection dunnage uses cantilevered steel frames that distribute equipment loads across the roof structure without penetrating the roof membrane — ideal for newer buildings with membrane roof systems. Through-roof post dunnage penetrates the roof deck and connects directly to the building's structural beams below, used for heavy equipment loads on older NYC commercial buildings. Steel catwalks and raised walkways with galvanized grating decks, pipe railings, and fixed ladder access provide safe maintenance access to rooftop equipment. Antenna mast bases and telecom support structures are fabricated for wireless carriers and building owners installing rooftop communications equipment.

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