Some embodiments of the present disclosure relate to a roofing system. In some embodiments, the roofing system includes a roofing membrane, which may include a cap, a scrim, and a core. In some embodiments, the roofing system may also include an adhesive film, which may include a first adhesive layer adhered to the roofing membrane, a second adhesive layer configured to adhere the roofing membrane to a roofing substrate, and a barrier layer positioned between the first and second adhesive layers. Methods of manufacturing roofing systems are also disclosed.