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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