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You cannot rely on regular strap hangers on a roof. You must mount the ductwork to heavy-duty, engineered structural roof pipe stands or unistrut support blocks (like Pate or Miro bases) that are anchored or weighted down.
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You cannot rely on regular strap hangers on a roof. You must mount the ductwork to heavy-duty, engineered structural roof pipe stands or unistrut support blocks (like Pate or Miro bases) that are anchored or weighted down.
Fasten the duct securely to these bases using heavy-gauge structural steel angles. The ductwork itself must be fabricated from heavier gauge steel (often 20- or 18-gauge) or wrapped in a continuous weatherproof cladding (like Embossed Aluminum or Ventglas multi-layered jackets) to prevent wind buckling and water entry.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.