In previous issues, we have discussed the key issues you will face if you need to undertake a major roof replacement. Since building science continues to evolve, we thought it would be a good idea to talk about roof replacements considering a broader range of system options.
Let's begin by identifying conditions on a given building that could contribute to the failure of a roof system.
Like any building system, age is a factor. On average, a properly specified and installed roof can last between 10 and 15 years. Even if it is properly maintained, every roof will ultimately reach the end of its service life. In other words, your roof may just simply wear out. However, in most cases, when a roof fails, there is a root cause(s) beyond simply "old age".
From my experience, there are 3 primary reasons why roofs fail; poor design, poor installation, poor maintenance, or in some cases, a combination of all three.