I will be installing "beaded" plywood, 1/4 in., as a ceiling for a
patio cover. I have 16 in. center rafters. I want to use
"deck wood screws" to install the ceiling so if I need to get access
above again I can simply unscrew it. How close would the screws
need to be along the rafters... every 6", 10", 12"
Thanks..