The answer to 'how often to replace roof' is that most roofs need to be replaced every 15-25 years, depending on the roofing material and other factors. Asphalt shingle roofs typically last 15-20 years, while metal, tile, or slate roofs can last 20-25 years or more with proper maintenance. The frequency of roof replacement depends on factors like climate, roof slope, ventilation, and the quality of the original installation.
It's important to regularly inspect your roof and address any issues like missing, cracked, or curling shingles. Catching problems early can extend the life of your roof and prevent more costly repairs down the line. If your roof is nearing the end of its lifespan or you notice significant damage, it's best to consult a professional roofing contractor to evaluate your options for replacement.