A sparse ruler is called optimal if it is both minimal and maximal. Since the number of distinct pairs of marks is m ( m â 1 ) / 2 {\displaystyle m(m-1)/2} , this is an upper bound on the length L {\displaystyle L} of any maximal sparse ruler with m {\displaystyle m} marks.
1 One 23/32-inch 4x8-foot plywood piece weighs approximately 67 pounds, while a piece of OSB of the same dimensions weighs approximately 78 pounds.
#1. OSB Roof Decking Thickness - 7/16, 1/2, Or 5/8. Currently we space rafters 16 oc and use 7/16 OSB with H clips. We're in Dallas so we don't engineer for tremendous live loads for an asphalt shingle and we feel comfortable with 16 oc rafter spacing and 7/16 OSB decking. I'm contemplating upgrading to 1/2 or even 5/8.