I have a neighbor who has been a construction framer for the past 20 years and he always looks over the fence to tell me I am doing it wrong. Two items I would like to clear up. He says I need to put a gravel under my footing blocks. I have never seen this before on deck footings, it seems like it would do nothing more than isolate a pond around my footing. (I am using (4) of the 12"x12" pre-cast footings) And the second he says there needs to be a slope to the deck of 1/4" per foot for drainage. Again never heard this or understand why this would need to be done. My deck is 8' deep so I would need a 2" drop??