On 25 Mar 2006 05:05:09 -0800, wrote:

Augusta Chronicle commented the June - Aug period will have the
"typical" 4" of rain each month. Lattice under the porch and plywood
shows at the floor edge leading out to the deck implying ply on entire
floor. We'll probably lift the covering and live on the safe side for
now as there are too many other tigers snapping at our tails. Thanks
for the informative response,

Don't bank on an inch per week - probably won't happen. Mebbe 4" per month
will fall, but likely it'll come as a couple of inches in one storm and a
couple of inches in another (or all 4" at once) with dry spells between.
That's usually how it works west of Atlanta (my location) and Augusta, as a
general rule, is dryer (and warmer) than here in summer. Usually, we depend
on winter and spring to recharge the water supplies - tropical systems can
change that drastically, but not dependably.

FYI, if you shop around online at the local TV stations' sites you can
probably find the monthly averages for rainfall and temp, and possibly the
records as well. If the TV stations don't have the info (or a link to it)
look at the National Weather Service. I think you'll find that the "rainy
season" ends along about the end of May and doesn't start back until around
November or so.

Good idea to lift the cover. Putting it out when company comes over or for
special occasions will help keep your plywood dry. If plywood gets very wet
with any regularity, the plys will separate sooner or later, causing buckles
- even the treated stuff. Probably best to replace with other material when
you get rid of some of the tigers.

In the meantime, I'd suggest that you ask around about the best way to seal
the plywood against water. The end grains of the plys are the most important
as that's what will soak up the most water - but the flat surface is
important too. Since the porch is screened, water that gets onto the porch
will have a hard time getting off as it probably can't just run off the side.
An advantage of 5/4 decking is that the water can escape through the cracks
between the boards instead of puddling. The screening will help to keep a lot
of water (depending on wind speed) from getting onto the deck part of the
plywood, so you have an advantage there...

Although I've never used it, I'd bet that the cover you have would dry quick
enough not to mold if it were on top of regular decking instead of plywood.

Depending on the size of the porch, may not be too expensive to deck with 5/4
decking - particularly if you do the work yourself. Dunno your skill level,
but it's pretty straightforward unless the roof supports *don't* pass through
the decking. Having to support the roof during replacement makes it a bit
more difficult and may require replacement of the supports if the thickness
of the new decking is less than the original material (5/4 should be thicker
than plywood), but not impossible for the do-it-yourselfer. FYI, I'd
recommend the galvanized screws over nails - even the spiral shank nails pull
out enough for the heads to be a problem after a few years of regular deck
use in my experience.


Later, Mike
(substitute strickland in the obvious location to reply directly)
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