Your roof shingles will not last forever. At some point, you will need to replace them. It may not be soon but you need to learn how to replace them, just in case. There are different factors that will damage them. They can be damaged by the weather and other factors. Your shingles may not be that sturdy as well, which requires them to be replaced occasionally. You will need to inspect your roof regularly to know when to replace some of these shingles.