in buffalo ny: if this is on a concrete slab allow for rising moisture
and easy snow removal. if you have kids and pets you will be avoiding
oily deck toppings. if this is a porch with a crawl space, it will be
also handled according to your climate/rainfall/drainage of the home.
in some cases a rubber roof material may be the department you seek. my
neighbor used some newfangled roll of a self-stick roof material i
would explore to see if it is needed to keep the plywood dry. subject
to your climate an extra hose spigot and a lawn sprinkler may be
desired for daily rinsing of a deck you are describing. ours is on on a
windup water shutoff timer. we have used those colorful 24" square
interlocking playrom padded rubber squares with some success except not
in winter. good luck!
browse your major concerns he
http://www.buildingscience.com/resou...r_Renovate.pdf

smcjensen wrote:
I have a screened in porch that currently has increasingly gross
outdoor carpeting on it. A dog, two kids, a sandbox, spilled
bubble-juice, and one end that gets soggy each time it rains has made
it pretty gross out there. It's now beyond the help of a steam
cleaner.

I was thinking of putting tile down out there. The subfloor is
pressure treated 3/4 plywood. It feels structurally stiffer than the
floors in the house, seems well built. I figured I'd put down cement
board over the ply, mortar those joints, and put down some one foot
square tiles with some texture to them to get traction when it's wet
out there. Any recommendations along the lines of do it or don't do
it, adhesive type, grout type, tile type? My biggest fear would be
expansion and contraction with the seasons causing cracks since the
subfloor's not in a climate controlled area.

Thanks, all.