We have concrete patio and currently we have plastic sand box there.
However, this sand box traps moisture inside, and now that rain are over
(I am in north California) sand is very wet and simply discussing.
I am thinking about building new wooden sandbox for kids, but I am
wondering hat to do with moisture. Draining down is not an option due
to concrete. I am thinking about have "vents" in the cover so moisture
will escape, but I am not quite sure what exactly I need to do and I
don't want to have caver too heavy.