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(OP)
For rooftop ductwork, what is the best way and cheapest way to support a duct in a seismic zone such as california?  Lets say the duct is 30x30.  Is the best way to do it to get a flat block and lag bolt it into a roof joist?  Then stick the tube steel support on top of the flat block and connect the tube steels with angles?  I am trying to avoid welding because that requires special inspection.  Then install the roofing over the block with a steel skirt around the tube.  I know most people just stick a block on the roof and mastic it on the bottom and then put the supports on the block.  I don't think that flys in California anymore.  What do you think?   

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