BUILDING INTEGRATION OF PV ON ROOFS

The roof structure provides a favourable solution to the integration of a PV array within a building. Roof applications generally require minimal compromise in solar orientation, particularly in the UK where the majority of roofs are pitched and the south facing aspect will provide optimal operating conditions. Roofs areas are also generally an under-utilised building component that provides weather proofing, encourages water run off and provides security.

Siting of a PV array on the roof is also advantageous because its elevated structure will be less vulnerable to overshadowing caused by surrounding structures, future development and landscaping. The risk of damage or vandalism to the PV modules is also minimised when located on the roof and the void spaces created by the roof structure are often suitable for housing the system components of the PV array.

In terms of aesthetics, large areas of flat roof or sawtooth roofs, like those on warehouses etc appear to provide the greatest opportunity for utilisation with minimal visual impact. In other situations, particularly housing the roof may be visually of greater significance, therefore careful design and installation of the system that does not greatly detract from the general appearance of the dwelling is crucial. PV can then be 'flush fitting' or harmonised using PV integrated roof tiles, thus PV can become an integral part of the townscape of the 21st century.

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