- portal for building integrated photovoltaics

Sloped and sawtooth roofs

If facing south, sloped roofs, commonly found on residential buildings as gable or pitched roofs, are ideally suited for utilising solar energy thanks to their inclination. If the entire roof surface is used for photovoltaic purposes, the PV modules can be combined with conventional roof coverings of tile or metal.

When installing, attention must be given to
  • rainproofing the roof and
  • adequate module ventilation.
For standard modules, a system of metal sections is attached to the roof substructure. The modules are inserted into this frame, e.g. with clips or by gluing. Overlaps, drain sections, or sealing strips ensure tightly sealed joints.

Sawtooth roofs can be implemented as (semi-)transparent or opaque. Glass sawtooth roofs make optimum use of daylight, protect against direct sunlight, and thus minimise a building’s cooling loads.
Figure 1: In-roof PV system of the Church of the Sacred Heart

Source: Sachsen Solar 2009

Figure 2: Sawtooth roof with PV integration, DIY store, Hamburg

Source: Alwitra GmbH & Co.KG

Last page update: 25.01.2011