In the life of every house there will come time to replace the roof. As a general rule a roof needs to be replaced every 15 to 20 years just to be safe. There are other times though when it is a necessity such as after a bad storm that has damaged it with wind or hail. Sometimes it is in the best interest of the home to replace the roof using a more durable roofing material. It is a very good practice to inspect the roof frequently to ensure that it is still in good condition. Here are some signs that it is time to replace your roof. For more on roof remodeling check out, http://www.squidoo.com/roof-remodeling.