Central Indiana is well-known for its ice storms. Ice can cause shingles to crack and tear off, causing leaks. When ice thaws and then refreezes, it can cause parts of your roof to warp and become unstable. Pre-existing cracks in the roof only become bigger when ice gets in and expands the crack. Even if you only have icicles, these can indicate ice dams up on your roof. Ice dams prevent snow from running off and melting as it should. Instead, the snow or ice melts and leaks into your home.