Gary Curtis wrote:

>The blocks are laid down as a parquet, end down, so the top view is a 3.5x2
>inch matrix of wood. The depth is also 2". There is no need for sleepers
>along the side, only some shimming to keep the assembly tightly knit. No
>pressure treated lumber, no glue, no waves, no buckling or sagging (that
>would be waves), no cold feet, no collapsing under the weight of heavy
>machinery.
>  
>
Gary,
The power station I worked in for 30 yrs had similar "parquetry" areas  
in front of the
machine shop lathes, milling machines, drill presses etc. It was well 
recognised that less
'operator fatigue' occurred when the machinist was standing on a surface 
with a bit more
'give' that concrete. Resilience is probably a better word.
The more modern power station down the road had bare concrete with those 
industrial
rubber compound or synthetic mats in place of the wooden parquetry.
The result was probably the same but far less costly to install.

Peter B in sunny NSW,  Australia. (Probably close to 80F, not sure what 
has happened to
autumn)

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