Originally Posted by Glenn Lawn Care
Sand and class 5 should be enough for drainage. Just make sure the patio itself has drainage and that start with the class 5 and a laser level. example: Where you want all the water to drain should be the lowest point around an inch. And at the other end of the patio should be at 3 inches and dropping a 1/4 to 1/8 of an inch every 10 feet down to that inch I mentioned earlier!
So there's no need for actual drains under the patio with the gutter downspouts tied it (to get the gutter water off of the patio).