Knowing when to replace a roof is one of our most popular questions. There are several key signs that indicate roof replacement is in order, such as:

• Bucking and curling shingles. Bucked shingles occur when moisture in the attic space causes nails to push out of place and loosen the shingle. This compromises the shingles’ performance and exposes the roof to the elements, which can result in leaks and even more moisture damage.
• Algae growth. Bacteria from algae eat through the shingles, especially if they are low-cost shingles that are made primarily of limestone. According to the Department of Energy, cool roofs are more susceptible to algae formation, although any roof color can experience algae growth.
• Missing granules. Asphalt roofing shingles are made up of small granules. When these granules come loose, it can impact the shingles’ performance. You can locate missing granulates by looking for fragments in the gutter system.
• Missing shingles. Professional roofing contractors are highly skilled at roofing installation and keeping shingles in place. However, these can blow away in the wind or become loose as they age. Missing shingles can allow rainwater into the home.
• Mold in the attic. This is one of the most concerning aspects of roof replacement. Mold forms in areas such as the rafter beams and the plywood on the underside of the roof.