A: The symptoms are different for different types of roofs. Shingle roofs typically need to be replaced when they become dry and brittle. Signs that this is happening include more granules appearing on the ground around the house or on the roof, discoloration in the shingles, or curling shingles.
The primary reason to replace a tile roof is that the underlayment has deteriorated. The underlayment is what keeps the moisture out. However, it can be difficult to see the condition of the underlayment because it is completely covered by the tile. The best way to determine the health of your underlayment or your tile roof is to be consistent with your yearly inspections. Elastomeric roofs routinely need to be recoated every five to 10 years, depending on the thickness of the cover.