Whoa! Dry concrete is a very good insulator!
Roy Breon
========================================================
> -----Original Message-----
> From: Bill Hider, N3RR [SMTP:n3rr@erols.com]
> Sent: Sunday, October 11, 1998 11:06 AM
> To: SavageBR@aol.com
> Cc: w5ku@iamerica.net; towertalk@contesting.com
> Subject: Re: [TowerTalk] Corrosion Protection of Tower Base
>
> Well, I wasn't going to coment on this thread, until this message.
> Be careful with the advise below.? Coating the interface? between the
> tower leg and the concrete is fine.? But you should do only the
> interface, say, 12 inches into the concrete and 6 inches out of the
> concrete.? You shouldn't bury the concrete in any event (see a
> previous post).
> The reason for not embedding the entire steel tower base in "tar" is
> because that would electrically insulate the tower from the concrete.
> While you must add external ground rods/wires to the tower, the tower
> itself and the highly conductive concrete add to the grounding of the
> installation.? If you electrically isolate the tower from the
> concrete, you loose that capability.
> I used the 6 inch "out" and 12 inch "in" when applying roofing tar to
> my tower legs.
> In addition, you shouldn't bury the legs anyway.? Inless you are one
> of those guys who takes apart his tower every 3-5 years (and I assume
> that means digging up the base and re-installing it), I recommend you
> keep the concrete 6 inches above ground level and crown it
> appropriately to drain any standing water away from the legs.? That
> way, your tower will last far longer than you will.
> Bill, N3RR
> ?
> SavageBR@aol.com wrote:
> I don't use zinc anodes. But before I put my tower in the ground
> I have it
> coated with auto undercoat. I also have used the spray-on
> bedliner normally
> applied to pickup truck beds. I use several coats in both cases.
> You can take
> your bottom section to a pro and have it applied or you can buy
> two cans of
> spray-on undercoat at an auto parts store.
> Te manufacture of the spray on undercoat stated it should work
> fine. Be sure
> to wash down new galvanizing with a good detergent.
> Bruce, AA4Z
> ?
> ?
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