Odd screw pattern at south end of roof. Every 6 inches on every rib was way too many screws. As you can see the rest of the roof had only minimal screws. Worst of all the screws used were too short and only penetrated the old asphalt roofing and not the plywood sheathing. The owner and I replaced all the lower course of screws with longer ones and put another course at the bottom edge which held in a new insect preventer foam strip.
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Odd screw pattern at south end of roof. Every 6 inches on every rib was way too many screws. As you can see the rest of the roof had only minimal screws. Worst of all the screws used were too short and only penetrated the old asphalt roofing and not the plywood sheathing. The owner and I replaced all the lower course of screws with longer ones and put another course at the bottom edge which held in a new insect preventer foam strip.