Oil canning in concrete tile roofing refers to the visible waviness or distortion in the surface of the tiles that can look like ripples or dents. This issue is mainly caused by uneven stress across the tiles, which might happen if the tiles are installed improperly, such as being fastened too tightly or loosely, or if the underlayment is uneven. Changes in temperature can also cause the concrete tiles to expand and contract, leading to this buckling effect. A simple way to check for oil canning is to visually inspect your roof during different times of the day when light hits the tiles at an angle, making the waviness more noticeable. You can also gently tap on tiles to see if any feel loose, but avoid pressing hard to prevent damage. This kind of visual inspection can help you decide if you’re dealing with a minor cosmetic issue or something needing professional attention.
If you notice oil canning, choosing the right time to call a roofer is important. Minor cases sometimes resolve on their own as the tiles settle, but persistent or worsening distortion could mean improper fastening or underlying problems, requiring expert repair to avoid leaks or tile breakage. When you reach out to a contractor, ask how they plan to identify the root cause of the oil canning and whether fixing it will affect your roof’s warranty. Also, inquire about their method for fastening or replacing tiles to ensure it won’t cause further warping. A good roofer will take a careful approach to avoid creating new issues and provide a clear explanation suited for your specific tile system.