Quote:
Originally Posted by mswhin63
If my math is right 1.2m3, but you would be better contacting cement places to verify and if it also be a good idea to add 10-20% for marginal error which I usually do.
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Malcolm you don't exude much confidence in your math So I will wait till someone replies with a bit more confidence in their calculations
I am just trying to get some idea of what I will require for my observatory
