Big sweet chestnut

why would chestnut be classed as "Poor Mans Oak"

When we were asked for some oak or chestnut the other day.. i thought what will it be used for.. and on windo cills .. oak especially english oak was not going to be my choice it mooves cracks and does what it wants.. much better find some nice chestnut.. that will behave better.. anyway the pieces requested were huge 600 wide boards... and for me they look every bit as good s oak.. even look like oaks famous carts paw markings..

what do you think??