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Re: [TowerTalk] Crank-up base

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Crank-up base
From: Patrick Greenlee <patrick_g@windstream.net>
Date: Sat, 03 May 2014 09:40:37 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Fiber cement board would not decompose into a lubricant. Need more strength? Use cement backer board. It will last indefinitely in any soil wet or dry.

Patrick NJ5G


On 5/1/2014 11:37 PM, Roger (K8RI) on TT wrote:
On 5/1/2014 4:03 PM, Kimberly Elmore wrote:
I did exactly this with a base for my Rohn HDBX48 tower. The plywood will slowly decompose and as it does, soil will filter in to take its place. For all practical purposes, it all remains "undisturbed." What the tower engineers do not want is for the base to be sunk into fill dirt -- that won't be stable and you will likely have stability problems (the base may wobble with time such that your tower is no longer vertical).

Partially decomposed plywood is like grease.

73

Roger (K8RI)



With sandy soil and high water table, you risk having the hole walls collapse into the hole, which changes lots of stuff you don't want changed and violates the "undisturbed soil" requirement.

Kim N5OP




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