How to Build a Deck Over a Concrete Patio | Family HandymanIs your old concrete patio an eyesore? You can avoid the cost and mess of tearing it out by just screwing down wood sleepers and decking over it. ... after the first batch hardened, we poured on a thin coat and gave it a slight slope so water would run away from the house. Self-leveling compound hardens fast, so you can get on ... To prevent water from seeping down along the foundation, we caulked the gap between the patio and the house. at t