Why Are Screws Stronger Than Nails?
When attaching two items with a fastener, you choose between using a nail or a screw. In some instances the main factor may be time. For instance, when attaching plywood roof sheathing to roof trusses, it makes little difference in structural integrity whether you use screws or nails, but it would take much longer to do the job with screws. In many uses, however, the greater strength of screws gives them the advantage over nails. When joining metal to wood, screws or bolts are often the only option.
