Home improvement questions? Ask a handyman for answers
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Yes you can use lumber seal. I have no idea where you would use a 4 x 4. If this is essentially a wood framed shed 2 x 4's will do the job for walls, deck should sit directly on your concrete blocks. unsupported joist span no more than 6' for 2 x 4's, 9 or 10 feet for 2 x 6's
Cedar is not ok, pine is ok. Should be 4 x 4 at corners with doubled rim joist. FIY press treated would now uses copper which is non toxic. Arsenic has been banned in treated wood for decades. I have an organic garden. I'd use treated 4 x 4 posts. The rest, since it's elevated can simply be painted.
You're welcome. Yes the lumber seal and paint is ok. Use a post base bracket at the base of the posts to keep it out of any water.
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