this is ALL geometrical & ANY variances’ll throw off your calculations,,, neat we get 13.05b – you’d best buy another 3,,, when/IF you run out of conc, put in a bulkhead so you’ll have a good place to start when finishing,,, you’ll also need to cut in jnts every 2′ ( ? ) or so,,, if you don’t, not to worry – the concrete’ll make their own [ but you may not like the looks of them ! )
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