Hi everyone,

For the calculation of the heat island on the roof of a building, we have an open terrace where a part of it is covered by a wooden lattice structure with parallel wooden slats.

This structure is probably in turn covered by a retractable textile. The question is, would the floor material under the timber structure (1) or the timber lattice structure (2) count for the calculation? Or in any case, the retractable textile to be installed (3)? 

Thank you very much.