The color steel tile before installation works

Four-sided slope map
1): blue dotted line and red dotted line are vertical and horizontal skeleton
2): a distance to 50CM is better
3): b distance to 50-70CM better
Two-sided slope
1). Select the skeleton of the material, wood structure and steel structure are suitable.
2). Construction of the surface to be finishing flat.
3). Skeleton material specifications: Wood specifications for the 45MM × 45MM or more, steel specifications for the 40MM × 40MM or more
4). The vertical spacing of the skeleton should be kept between 50CM and 70CM, and the horizontal interval must be 25CM multiples, it is best not to be greater than 50CM, try to use screws, welding firmly.