What is the characteristic of asbestos-cement shingles' fastening system as it ages?

The characteristic of an asbestos-cement shingles' fastening system as it ages is that it often fails and needs replacement. Over time, the materials used in the fastening systems can degrade due to various environmental factors, including exposure to moisture, temperature fluctuations, and UV radiation. As a result, the integrity of the fastening system diminishes, potentially leading to loosening of the shingles or detachment from the substrate, which can compromise the roof's ability to protect the structure.

In older homes with asbestos-cement shingles, inspectors often encounter issues such as rusting metal fasteners or brittle materials that can break apart, making it crucial to evaluate the condition of these elements during an inspection. Regular inspection and eventual replacement of worn fastening systems are necessary to maintain the overall integrity of the roofing system and prevent further degradation or roof leaks.