One of the problems with Rohn tower sections,, all of them-25G, 45G, and
55G, when the galvanizing was done at
The plant,, galvanize would form inside the legs and create a "plug". Thus
the water would not drain thru the legs and out the bottom section.
What I have done to ALL tower sections is slide an eight foot ground rod
thru each leg to eliminate any
Galvanize plugs. This alone helps prevent water freezing and splitting a
leg. And, I have drilled a weep hole also...I hate to
Do that cause it is a weakness, not much at all, but slight. I might say, I
have not seen the galvanize plugs this day and time as much as 20 yrs ago..
Dan N4GNR
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Patrick Greenlee
Sent: Friday, January 29, 2016 11:56 AM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Tower buried section legs -- Buried in Concrete
orBelow the Concrete?
What does the brain trust think about the idea of plugging the ID of
tower legs slightly above the top of the concrete foundation and
drilling a weep (drain) hole at the top of the plug. It would require
poking into that hole periodically to prevent insects or whatever from
plugging the hole but should eliminate the need for any concern or
proactive adding of pea gravel below the tower legs or acid soil eating
on the bottom of the legs.
Patrick NJ5G
On 1/29/2016 10:40 AM, Chris Wynn via TowerTalk wrote:
> On my first Rohn 25 tower that I put up while in college, I had water get
into a leg and actually busted outwardly. It left about an inch and a half
rip looking seam. This occurred about 4 feet from the top of the concrete
pad. I could only imagine that there was some type of obstruction in the
leg that allowed water to build at that point. When it froze, the water
expanded outwardly, busting the leg.Regardless, the tower lasted throughout
my college career and until I later got married and moved out. I would
imagine that my father is still using that section to hold up one of his
bird houses.I would add that pea gravel as a way to drain any moisture, just
in case....
>
> Good luck
> Sent from Yahoo Mail on Android
>
> On Fri, Jan 29, 2016 at 8:51 AM, Larry<lknain@nc.rr.com> wrote: I
have always put the pea gravel in the bottom as spec'd by Rohn. The way
> the legs are constructed and assembled on G sections I suspect there is
very
> little water that gets in the legs. Probably more of an issue if the top
> section is just another straight section and the ends are not capped in
some
> way. But I could imagine a very small amount of seepage perhaps through
the
> bolt connections and perhaps over time rusting out the bottom of a leg
that
> is sealed in concrete. Perhaps condensation in some environments could
play
> a role. The latter two seem awfully remote to me.
>
> 73, Larry W6NWS
>
> -----Original Message-----
> From: Larry Loen
> Sent: Friday, January 29, 2016 7:17 AM
> To: TowerTalk
> Subject: [TowerTalk] Tower buried section legs -- Buried in Concrete
orBelow
> the Concrete?
>
> The Rohn spec calls for the legs of the bottom section to be buried a few
> inches in pea gravel below the concrete. My contractor suggests that as
> long as the top is properly sealed, it's overkill and that overall, it's
> better to encase the legs in concrete, protecting them from corrosion from
> that rare day in Arizona that the water levels would reach the bottom of
> the tower. He suggests that the tower will be adequately sealed on top.
> Soil here is acidic enough that I've been advised not to let the tower
> sections touch the ground for even the short time they are stored here
> awaiting erection. Even if some got in over the years, rainwater is
> presumably less acidic.
>
> I don't try to innovate in these matters, but I wonder who is right here.
>
> Thoughts?
>
>
> Larry WO7R
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