I had a patio that had sunk replaced. The new patio seems too high- the landscaping was the obvious problem, but now I am concerned because the patio butts against the house and is right up to the siding. Will this cause problems as water could force its way in and rot out frame? Is there a standard that should be followed? Construction code? Also what is the standard for "pitch"? Water puddles on my new stamped concrete patio? Shouldn't a pitch cause water to run off?