When your roof has multiple leaks or many damaged shingles, it usually means it's time to replace the roofing. To test an asphalt-shingle roof's condition, bend over a corner of one or two shingles on the sunniest side of the roof; if they break rather than flex, the material is nearing the end of its serviceable life. Wear is another factor; a collection of mineral granules in gutters or at the base of downspouts indicates that the protective mineral surface of asphalt shingles is wearing away.

If re-roofing your home is on your upcoming list of projects, there's one additional thing to consider besides the type and color of shingles, you're going to use --- ice and water protection. Every roofing material will have some type of felt paper used under it to help the roofing in its fight to ensure a water-tight roof. But ice and water protection goes one step further, and, particularly in areas that are prone to snow buildup and ice damming, this additional protection can mean the difference between a dry attic and the headaches of wet insulation, water-damaged drywall and water stained ceilings.