warehouse. metal roofing screw spacing 33 with metal roofing screw spacing . picture25 img_5136. what determines the quantity of wood needed depends basically on the height of the roof, how complex the roof is? which may leads to lots of offcuts etc. would be very close to the center leaving a little over a 10 foot span on either side to determine the exact height of the wall, we shot a laser line from . panelized . an innovative use of ultra-span cold formed steel trusses.