BY WILLIAM CRUM wcrum@opubco.comStrong sales of lumber and roofing materials and high demand for rental equipment helped keep Oklahoma City sales tax collections growing last month. Sales taxes were up 2.9 percent over the same period in 2012, reversing a decline the previous month but short of the growth projections for the year. An analysis prepared for the city council says building materials sales likely spiked — rising 21 percent — due to residents repairing damage caused by May's tornadoes. Utility sales were down 4.4 percent — likely due to mild weather — and clothing sales were up 5.5 percent.Read more on NewsOK.com