English to German Law/Patents Energy / Power Generation Photovoltaik

Es geht um Photovoltaikanlagen, d.h. um gebäudeintegrierte Photovoltaikanlagen (BIPV).
Gut, die PV (=Photovoltaikfolie) muss an diesen "backsheets" angebracht werden, außer Rückseite fällt mir nichts ein...kann jemand helfen? Danke!

The BIPV products consist of PV foil integrated with "building component backsheets (e.g. roofing membranes)".... the PURCHASER wishes to supply the "backsheet" of the Products to THE SUPPLIER, meaning that THE SUPLLIER will laminate its PV foil onto the backsheet provided by the PURCHASER, resulting in the Products."