The roof is your home’s first line of defense against the elements. Take care of it and it will take care of you. Nipping problems in the bud can also save you big bucks in the cost of emergency repairs — which average $1,000, for things like leaks and ice dams. And in a worst-case scenario where you’re forced to replace the roof prematurely, you could be on the hook for $8,000 or more. Fortunately, a roof is a pretty…