Just because your roof is damaged doesn't mean that you have to replace it in its entirety. For example, you don't have to replace the whole roof if the shingles are damaged but the supporting roof structure is still intact. Here are some signs that it is time to replace your roofing shingles (assuming the other parts of the roof are intact):
Most of the Shingles Have Lost Their Granules
The granules on roofing shingles serve two main functions – providing aesthetic value and protecting the roof. The granules are what give the shingles their distinct coloring because they are where the colors are concentrated. Your roof will lose its color if it loses the shingles. This can leave you with an ugly roof, especially if most of the shingles have lost their granules but some are still intact.
Apart from giving your roof its unique beauty, the granules also protect the shingles from damage. For example, the granules protect the roof from damage from the sun by reflecting and absorbing some of the ultraviolet (UV) radiation. Therefore, your shingles become susceptible to damage if they have lost their granules, and replacing them is the only possible remedy for the situation.
Most of the Shingles Are Physically Deformed
Roofing shingle experience physical deformities if they are subjected to stronger forces than they were meant to handle. Foot traffic, falling tools, hailstorms, and falling tree branches are some of the common causes of shingle's physical deformities. The shingles can also be deformed when they are exposed to extreme temperatures, especially if they have lost their elasticity and protective granules. You will know it if your shingles are physically deformed because they will be curling, broken or buckled. You will have to replace the shingles if most of them are physically deformed.
Most of the Shingles Have Fallen Off the Roof
Roofing shingles protect the rest of the roof's structure from damage. For example, if the shingles are missing water from melting snow or rainfall will be able to enter the roof and cause severe damage. This is why you need to replace the shingles as soon as possible if most of them are missing. Ordinarily, it is not common for a roof to lose most of its shingles at within a short period. However, shingles can start falling off the roof if they are extremely old, if the roof has been damaged in the storm or if the shingles used on your roof were from a bad batch.
If you're noticing any of the above issues with your shingles, contact a roofer at companies like All Weather Exteriors.