I would do what the manufacture says: http://www.rohnnet.com/bracketed
John KK9A
To: towertalk@contesting.com
Subject: [TowerTalk] Update on 40' non-guyed tower question
From: Rob Matherly <jimrob@gmail.com>
Date: Thu, 5 May 2016 11:08:56 -0500
A couple weeks ago I asked about self-supporting a 40' Rohn 25 tower.
After input from the list and a no-vote from the Missus on guy wires strung
across the yard, I've gone back to my original plan to house bracket it. I
have a two-story with 10' ceilings, so there's plenty of house to hold it
up. (There is some concern regarding my metal roof, but less than I'd have
to deal with if I were to anchor a guy wire in a flower bed.)
Question #1 - I've read at various sources that I can go 16' above the
bracket. Is this correct? Assuming my rough estimations of the house
height are correct, my top bracket will be at about 30'. I will also have
a bracket in the 15' area. I should be safe with about 45' of total height
including my mast f I understand the Rohn data correctly. Let me know if
this is incorrect, please! I will also be sistering the studs to help
spread the weight out a bit.
Question #2 - I'm going to homebrew the house brackets since I have the
equipment and know-how to build it correctly (and not some hobbled-together
mess of metal.) Does anyone here have dimensions and specs on the
materials used? I believe the angled pieces are 2x2x3/16 galvanized, but I
am not 100% on that. I do not have any information on the thickness of the
flat steel.
Question #3 - It is my understanding that, since it is bracketed to the
house, the concrete base does not need to be as large - 2x2x3 as opposed to
3x3x3. Is this correct? I don't want ground heave to damage my house.
Thanks again, folks!
Rob, w0jrm
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