[TowerTalk] Crank-up base

[Patrick Greenlee]

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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