I'd like to enclose the space beneath my deck and use it as a shed. It is about 7 feet high, and 15 x 12. How do I go about water-proofing the bottom of the deck, as well as the sides of the new enclosure so that I can keep my lawn mower and yard equipment dry? Thanks a lot. By the way, I know very little about building anything so simple is best...
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That isn't a beginners project. Even some seasoned carpenters will have different ways to go about it. It's a "need to see the site" question, that's probably why no one has answered as yet... we could give you generalizations but it really wouldn't help you at all, there are just too many variables to take into account.
Call up a local carpenter to have a look, pay him/her a couple of bucks to give you some suggestions or work with you.
You'll never have a complete waterproof shed under a deck with standard decking materials and gaps.
There is a product or two out there that you can mount under your deck on the joists and it carries the water that comes through the cracks to a gutter. and away from area. Or you can rig your own with fiberglass corrugated sheeting and slope it.















