wrote in message
...
On Mon, 22 Dec 2003 14:24:14 GMT, (AgaPSDIVER)
wrote:

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..

exterior grade?

BB

for 1/4" with no weight above the boards, 12" would be sufficient.