At 02:45 PM 1/15/01 -0500, Mike Murphy wrote:
>I have been watching this post for some time. I can't help but wonder if we
>are forgetting that an exterior wall of a house was never meant to take a
>lateral load, especially from 30 or 40 feet of tower hanging over it. An
>exterior wall is meant to support the roof, not a tower pushing and pulling
>on it.
You better damn betcha that the exterior wall of a house is designed to
take lateral loads. If you're worried about that (XXX) MPH wind blowing
against the tower and antennas what do you think is going on with the flat
wall of the house. The wall typically has a lot more square footage that
any tower/antenna and is a "flat plate" with a higher drag coefficient that
the round stuff in the antenna.
Furthermore, in a good windstorm, the walls are probably holding the roof
down, not up.
I'm not advocating bracketing to a house. I would never do it to mine and I
built it and it's way over engineered, but it happens to be stuccoed and I
have enough cracking problems.
Nevertheless, don't forget the story of the three little pigs.
Wes N7WS
>
>I have put up, taken down and serviced a number of towers. And it simply
>amazes me what hams "get away" with. It may work for a while, maybe
>forever. But if you need 110 MPH wind survival, put up a free standing
>tower that is designed for it. Otherwise you are playing with fire, not to
>mention taking a chance on pulling down part of your house.
>
>Michael Murphy - KD8OK
>
>
>>The bracket is over designed as much as I could. Where it attaches to the
>>house it is 5' long and it has three bolts that go through vertical 2x4. I
>>have this backed up with a horizontal 2x4. All of this including the bolts
>>are stainless steel. Several locals have agreed that this is done properly
>>and I believe it to be a better bracket then the one Rohn uses in their
>>bracketed towers.
>
>
>
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>
>
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