Building integrable photovoltaic (BIP) modules include photovoltaic inserts for producing electrical power and supporting structures for mechanically attaching and supporting the insert with respect to a building structure, such as roof tops. The supporting structures may include ventilation ribs that form ventilation channels under the photovoltaic insert and, in certain embodiments, under other components of the module. These ribs may be used to provide mechanical support to the entire module. In specific embodiments, ventilation channels of one module are configured to coincide with ventilation channels of one or more other like modules and to form a continuous channel along the roof edge. The supporting structures may be used to form moisture barriers in between two modules, such as side glitters. In certain embodiments, supporting structures are separate components and are attached to the insert to form a module during fabrication or installation of the module on a building structure.