Specifications include, but are not limited to: The installation of the roofing system shall be in accordance with this specification and the installation instructions printed by the manufacturer, as written on the back of each shingle bundle. Should the requirements of this specification conflict with those of the shingle manufacturer, the contractor is to notify DCD, but follow the shingle manufacturer instructions to ensure the availability of the required warranty coverage. However, where the shingle manufacturer's printed instructions offer options; e.g., the permitted use of nails or staples in the application of shingles, the contractor shall follow the requirements of this specification; i.e., the use of nails is mandatory