How To Patch A Roof Leak A common question we get asked is: How Long Does Tile Roof Underlayment Last? With properly installed tiles, if you look at the standard underlayment, you will likely see it is still in excellent condition and it should be able to last anywhere from 50 to 100 years, provided your tile is installed properly. It will still be plenty thick, and it should still be flexible, But when it is not installed properly, that's when you end up with the felt paper wearing out. As we saw in a previous article, How To Repair A Leaking Asphalt Shingle Roof, a poorly installed roof tile will cause problems leading to the eventual need to have a roof repair. In the first article, we got to the point of carefully removing the tiles to inspect the problems underneath. At this point, we found the plywood was in terrible condition and needed to be replaced. You may well find the same thing on your roof, especially if you've been seeing water leaks on the inside of your home, in the ceiling. Want to know more? Visit our website at http://www.DCRoofing.com or click the button below for more about residential roofing tips for Tucson homes.