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 unit bases mounted roof building structural beams

Roof dunnage unit bases mounted
through roof building structural beams, brooklyn nyc

Galvanized roof dunnage staircase pipe railings

Galvanized roof dunnage
with staircase and pipe railings, astoria, queens

roof dunnage galvanized grates grating deck stairs pipe railing

Galvanized steel structural roof dunnage with grating deck, stairs, welded pipe railings and antenna mast for major wireless carrier, lower broadway manhattan

metal raised catwalk galvanize ladder fixed

Metal raised catwalk with galvanized grating and fixed ladders at each end, dumbo brooklyn

Mechanical room catwalk with removable guard rails, bronx ny

Catwalk mezzanine for mechanical room with galvanized grating, lower east side manhattan

Pocketed steel roof dunnage / floating
and painted. (Long Island, NY)

HVAC roof dunnage with expanded metal security cage. (Westchester, NY)

Small painted structural roof dunnage. (Bronx, NY)

Floating roof dunnage moment
connection. (New Jersey)

Post for HVAC thru roof dunnage. (Bronx, NY)

Steel catwalk raised framing on tube posts, Long island city

Raised catwalk with ladders, bronx ny

Fireproof stair and ladder, long island city ny

Catwalk, midtown manhattan

Why Contractors and Building Owners Choose Steel Masters NYC for Roof Dunnage

Custom fabricated to your rooftop layout — every dunnage frame is built to your unit footprint, equipment weight, roof penetration requirements, and structural beam locations.

Pocketed, floating, and through-roof configurations — we fabricate standard surface-mounted dunnage, floating moment-connection frames, and through-roof structural post systems depending on your building type and load requirements.

Galvanized steel as standard — all rooftop dunnage and catwalk fabrications use galvanized steel for maximum corrosion resistance in New York’s rooftop environment.

Catwalks, stairs, and railings included — access catwalks with grating decks, fixed ladders, pipe railings, and staircase access fabricated as part of the complete rooftop package.

Security cages for rooftop equipment — expanded metal security enclosures fabricated to protect HVAC units, antenna masts, and mechanical equipment from theft and vandalism.

Over 50 years of NYC commercial ironwork — Steel Masters Inc. has fabricated roof dunnage and mechanical support structures for NYC commercial buildings since 1972.

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.

Serving All Five Boroughs, Long Island & Westchester

Our crews fabricate and install HVAC roof dunnage and steel catwalks throughout Brooklyn, Manhattan, Queens, the Bronx, Staten Island, Long Island, and Westchester. We work directly with HVAC contractors, general contractors, building owners, and property managers.

Send us your rooftop drawings or call us at (888) 577-8335 or contact us online for a free estimate. We’ll review your equipment specs and rooftop layout and provide a written quote.