Tell-tale signs your roof needs replacing
Curling roof shingles can be caused by improper installation, inadequate attic ventilation, a defective product, or old age. Curling shingles are weak and will eventually crack and result in roof leaks. You will need to replace the roof if your shingles are curling.
A properly installed roof normally lasts 20-25 years. If your roof is getting to that age it is nearing the end of its lifespan.
Granules will come off as a roof ages, however, if you notice a lot of missing granules or if you see granules collecting in your gutters it may be time to replace your roof.
If you notice ceiling stains or water damage of roof wood you might have a roof leak. These leaks are sometimes difficult to pinpoint, so you might need to call an expert.
Missing or Broken Shingles
An older roof might lose sealant & become loose or fall off. Extreme weather conditions or falling debris can also contribute to shingle damage. If you have a large amount of missing shingles, it is generally a sign of improper fastening or exposure to high winds and your roof should be replaced.
A buckling roof can be a result of roof decking not being installed correctly, improper installation of underlayment, or from installing new shingles over an old roof.
Blistering Shingles can be a sign of poor attic ventilation or extreme temperatures and humidity. If these blisters burst you will start to notice missing granules.