[TowerTalk] Bay Area Structural Engineer Needed

[JVarney K6VAR]

(Apologies if this shows up as a double posting)

I'm a licensed civil engineer in California.  A couple of thoughts I'd like to share:

I would advise any ham concerned about liability or insurance in the case of tower failure to not automatically use "generic" plans and specifications provided by any tower manufacturer. While a photocopy or a .pdf file might satisfy the permit office at the County, it is questionable if use of such plans would hold up in court or pass muster with a sharp insurance adjuster.

The potential inadequacy of "generic" plans stems from the current landscape of building codes in California. State law requires the use of certain national and state standard codes that consider forces due to wind, earthquakes, ice, etc. and combinations thereof. Complicating this is many cities and counties modify these codes with their own ordinances. This is why a "generic" plan may not work in every instance. Local building officials are increasingly educated about all this and that's why many of them ask to see an engineer's signature on permit applications on any structure, including ham antennas. Some cities and counties ask to see the calculations as well.

Also, a "generic" plan might make assumptions about the footing, such as certain soil types or installing on a flat grade. Local site conditions might warrant a revised footing plan.

To summarize, I believe the value provided by retaining an engineer is to ensure a reasonably safe and serviceable installation as well as ensuring full compliance with all national, state and local code requirements.

73 Jim K6VAR

Disclaimer: this posting is informational only and does not constitute the practice of civil engineering. For engineering advice, please consult with an engineer licensed in your state and who is familiar with your local conditions, codes and requirements.