Ventilation under the covering should preserve the arrangement specified in the design throughout the entire service life. In practice, it may be altered by leaves, nests, later insulation or modification of the eaves. The inspection does not consist of raising active elements on one's own. First the documentation and visible symptoms are checked, and then the type of inspection is selected. In an integrated roof, both the building layers and the cables must be protected. The reference point is the design and the system instructions. They should show the required air supply, the flow path and the air discharge. Without this information it is difficult to assess whether a visible gap serves its proper purpose. One should not compare one's own roof with a random photo of another covering.

A roof that generates energy does not by itself guarantee that the home will have power after a grid failure. What is needed is a system designed for backup operation, with proper isolation from the grid and matching devices. Storage can extend the availability of energy, but its presence alone is not enough. Before buying, it is worth determining which loads should keep running, for how long and with what permissible interruption. A grid-tied inverter must respond to the loss of grid supply and must not accidentally feed energy into a disconnected section. That is why normal production stopping during a failure does not have to mean a roof fault. It follows from the principle of operation and the protective devices of the installation.