Kilrath
United States of America#2General Comment
Mon, March 12, 2012
You said that Farmers looked at the floor and found signs of rot on/under the foundation. was this something that was specifically checked before you bought the house in 2011? If so you might be able to make a case but the fact that Farmers covers sudden burst damage doesn't necessarily mean they will cover a pipe that was leaking for a couple days, sudden burst damage refers to something like a pipe actually blowing out like happened in our basement a couple years ago where a "burst-proof" pipe to an outdoor spigot froze and burst sending a couple hundred gallons of water down the drywall and carpet in our basement.
Good luck with your claim but chances are your individual case isn't something that they consider sudden burst damage. Personally i would just keep fighting it though because i would imagine that you should have some form of coverage that would apply.