can i use floor boards for the sides ? ive used ship lap on it and it has just swolen and bowed out it was treated with 3 coats of creosolt the wood has split around the screw heads and it was fitted correctly when i made the shed its not lasted a year . i thought of using feathered wood but as the shed makes 2 sides of the fence it needs to be thicker to stop the little s***s round here kicking it in any ideas?