Redneck in training
Elite Member
Another thing to remember is to place the nails or screws (according to Morton nails are preferable for the selfhealing effect) on the roof somewhat out of center of the rib and in about 60 to 70 deg angle. The fastener dimples the rib if the depression is on the top it will hold water. If it is somewhat on the side than the water drains away. It is also harder to pull the fastener by vertical force.