The shape of the tile determines the nature of the installation of the rafters and the crate. The step of the crate on both pediment is allowed different. The same step is not allowed for various types of tiles. In this case, it will not be able to firmly be attached to the surface of the roof. The rows should be measured and marking them. The uneven surface is aligned with rails that are placed in front of the process of filling the crate. Reiki placed under the crate leve roof ramp.















