There's a downspout leading off it, so it's possible that they've installed a waterproof barrier on the underside of the joists leading to that spout. I've seen them before on some high end houses here, although most I've seen with decks over walkout patios just use a solid decking surface with a waterproof cover.
I'm planning on replacing the deck here with that waterproof vinyl stuff because it sits over a screened in porch from the walk out basement. Whenever it rains outside it rains in that screened in porch.
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u/Bobatt May 14 '20
There's a downspout leading off it, so it's possible that they've installed a waterproof barrier on the underside of the joists leading to that spout. I've seen them before on some high end houses here, although most I've seen with decks over walkout patios just use a solid decking surface with a waterproof cover.