I am building an open deck over a first floor porch. Both are new construction. What should I do so the deck does not leak on the porch below? I have already put mahogany decking on the porch floor and would prefer to use some type of mahogany for the deck also.
sounds like you need 'scuppers' and a sloped sub-floor for your top decks floor. I'm sure there is a diagram of that somewhere on here or the net.