For the implementation of a framework, many constraints must be taken into account:
- Plan of the house (form, dimension, orientation …),
- Mechanical resistance to wind, snow, weight of cover,
- Slope depending on local traditions, the style of the house, the type of cover chosen,
- Attic or not,
- Presence of openings in the roof (skylights, windows, chimneys …),
- Thickness and type of insulation.