> There is no problem with the zoning department. The building permit
department told me I must meet Section 1609.1.1 (4.) of the 2006
International Building Code. The structure must meet TIA/EIA-222 for a
3-second gust of 130 MPH. (I am only 8 miles from the Atlantic in South
Carolina, so the area is rated for 100 MPH.)
This is where your PE will come in. Of course you have to be looking
at a tower that'll take your proposed tower and antennas and windspeed into
> To comply with the neighborhood CCNR the tower must be ?attached? to our
Easy. Just attach "something" to the house and to the tower. A client
of mine used a piece of plumbing tape (the galvanized flat stuff with holes
in it) with one end hose-clamped to the tower leg and the other end nailed
to a roof truss. Hey - it's attached!
> If I combine the high wind speed with the attachment
requirement, I am initially led to the Rohn 55G Bracketed tower. However,
I cannot find specifications from Rohn that meet the 130 MPH requirement.
The specs for the 55G only go up to a 3-second gust of 105 MPH.
Big problem. In order to get a PE stamp for something like that, they'll
need to do a big analysis of what's in that wall and it'll probably need
reinforcing. A fellow TowerTalkian, Tony. K1KP wrote up a nice article in QST
some years ago on this very topic. It took LOTS of reinforcing to meet the
building regs. Better to not use the house for a structural member.
> Where do I go from here? Do I need to add guy wires to the upper
sections? If so, where do I get the specs for the guy wires? All
suggestions would be welcomed for this new comer to towers.
Even R55G will need guy wires. You need to make your tower decision
first - either with guy wires or free-standing. Many times it's a spousal
approval so you know what'll be acceptable and what won't. It'll be easier and
somewhat cheaper to go with a guyed tower for your load and windspeed.
Cheers and GL,
PS - And you're off to a good start since you have already read the best
tower book available!
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