Deck Planking Cut

This morning I went over to my work buddy James' house and we (he) ripped the mahogany planks and basswood filler strips to size on his very nice table saw.


I think I need to narrow the king plank an inch or two so that I have more than just a sliver of mahogany between the outermost plank and the coverboard inside edge. Or I could trim 1/4" from each plank.