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| First of all, you have to use 3/4" ply for strength. If you can get away with doubling up the 3/4" that's even better. Make sure you cut the second one with the grain of the wood going in the opposite direction, this will make it even stronger and tougher to warp. Get a tube of liquid nails and some 1 1/4" stainless wood screws and screw the SH!T out of it on both sides. You now have a deck that you can jump on and is strong as #@*&!!!!!!!!
DON'T use treated wood, it will warp BAD no matter what you do to it.
After you have your plywood screwed together take it out to the garage and seal it with a good marine grade sealer on all sides with multiple coats. I've done this on many boats and they last forever. The only thing that hurts the deck is the carpet because it will trap water and keep it wet. When you install the carpet, use a good outdoor glue (for carpets) and make sure you use the right trowel for the application. This will help keep out the water and keep the carpet from coming up on you.
This extension will last you a long long time and is cheap and easy to do.
GOOD LUCK!
Ralph Florio
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