Will a tongue and groove deck make the underneath waterproof?
I'm replacing an existing ipe deck. I would also like the space under the deck to be a usable patio and therefore want to somehow waterproof the underside of the deck. The guy who came to give a quote on rebuilding it suggested using tongue and groove mahogany, which he says will prevent any water from passing to the underneath area. Is he right? He will pitch the deck slightly so the water drains off the side.