I am planning to run 1-1/4" black iron natural gas pipe around the outside of my house to supply an exterior tankless heater. The pipe needs to be attached to the wall and I'm planning to use two-screw metal hangers driven through the stucco into the studs underneath.I had a local plumber suggest using 2-1/2" deck screws for this purpose, but deck screws have no shear strength and are emphatically not structural screws. This plumber has repeatedly demonstrated a lack of knowledge of plumbing codes in California, so am pretty sure that deck screws are precisely the wrong thing to use.What kind of screws are the correct ones to use (that is, will keep the building inspector happy)? I couldn't find anything specifically called out anywhere and I would really like the pipe to not fall off the wall unexpectedly.
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