The increase of peak and energy demand during the cooling season is becoming a crucial issue, as well
as the intensification of the urban heat island effect. This trend is observed at several latitudes, including
areas where overheating was unknown at building and urban levels. This phenomenon involves different
issues: reduction of greenhouse gases, quality and comfort in outdoor and indoor environment, security
of energy supply, public health. The building sector is directly involved in this change and adequate
solutions can provide great benefit at energy and environmental levels. Roofs in particular are envelope
components for which advanced solutions can provide significant energy savings in cooled buildings
or improve indoor thermal conditions in not cooled buildings.