Structural Steel Roof Dunnage 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. Where equipment needs walk-up service access, dunnage is paired with structural steel catwalks - galvanized grating walkways with pipe railings and fixed ladder access. Antenna mast bases and telecom support structures are fabricated for wireless carriers and building owners installing rooftop communications equipment.
Roof dunnage is one of six structural steel alterations we handle; related rooftop scopes include mechanical room and rooftop catwalks and steel mezzanines.
Every job is measured in the field and built to that opening - we fabricate in our own Brooklyn shop and install with our own crew, the same way we have since 1972.