Interlocking roof systems can be made from several materials. The problems which arise are not necessarily intrinsic to the interlocking method but to the specific material used. Some of the more common are composition shingle, metal and slate.
Composition shingle seems to suffer most in high-velocity wind and is subject to consistent replacement throughout the life of the home. Metal poses less risk of fire and other damage. However, without the application of cooling features, a metal roof could collect a lot of heat during the summer months.
Slate and clay prove pricey due to the fact that the installation process is considerably more complex. Wood has an increased fire risk. According to Best Roof, the wood commonly used for roofs is a second growth form that tends to become brittle more easily.