Dependant on the position of the enclosure a solid composite roof panel is used which reduces the heat build up in the area. A combination of this panel and glass is used at times to still allow light into the area of the house behind the enclosure.
Roof windows are an option to allow the heat to escape the room.
Vertical glazing of the enclosures is possible with a range of products to suit your requirements from sliding folding doors, sliding doors, windows either casement or sliding or simply fixed panels.