Do I Need Structural Engineering for Rooftop HVAC?

Quick Answer

Yes — adding or replacing rooftop HVAC equipment usually requires structural engineering. The roof framing must be verified to carry the weight of the equipment. Most building departments require stamped structural calculations and drawings for rooftop equipment additions. Even equipment replacements may require engineering if the new unit is heavier than the old one.

When Structural Engineering Is Required for Rooftop HVAC

Adding new rooftop units where none existed before
Replacing an existing unit with a heavier unit
Adding multiple units to a roof not originally designed for rooftop equipment
Equipment that concentrates load on specific roof framing members
Building permit requirement in most commercial jurisdictions
When a seismic anchorage calculation is required

What the Structural Engineering Covers

Existing roof framing capacity evaluation at equipment location
Equipment weight verification from manufacturer data sheets
Roof curb and support frame structural design
Seismic anchorage design per current IBC and ASCE 7
Wind uplift anchorage design
Structural permit drawings and calculations
Coordination with mechanical engineer on equipment locations

What to Send for a Rooftop Equipment Structural Proposal

Equipment weight from the manufacturer data sheet (operating weight)
Roof framing type and information — existing drawings if available
Location of equipment on the roof
Jurisdiction — seismic design category varies by location

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Get Structural Engineering for Rooftop Equipment 480-490-0064