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Raised beds

Hi all!

I'm doing my first raised bed and have some questions.  It's going to be
raised to waist level, therefore I need to find something for the bottom.

I've checked the listserv for the last year or so and everyone says don't
get pressure treated plywood.  I'm a novice when it comes to lumber.  Isn't
plywood glued together layer by layer and will this glue bleed into the
soil somehow?

I've already purchased the redwood for the sides, but am still undecided on
how to deal with the bottom.  The lumber salesman suggested strand board
for a more inexpensive option and coating that with a fiberglass kit to
make it waterproof.  Does anyone know if a fiberglass surface would be safe
and not bleed any dangerous chemicals into the soil?

I am also wondering if the edges of the plywood should be sealed somehow so
that the soil doesn't seep out or is that defeating the purpose of having
good drainage? If not, what material is safe to use?

Last question.  I'm also going to do strawberries in half-cut whiskey
barrels.  The sturdiest ones I've located HAVE been used for something as
far my nose is concerned.  Has anyone run into any pitfalls with these
types of containers?

As I'm reading over this, I feel like a total alarmist :)  I appreciate any
pointers the seasoned gardeners out there can give me.  Thanks so much!

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