The profile of specific components, their configuration or sequencing, can vary with the roof system, climatic differences, and regional or area practices. Dimensions as shown are recommended minimums and are intended to be approximate to allow for reasonable tolerances due to field conditions. Curbs that can be roofed, base flashed, and counterflashed with sheet metal are recommended in lieu of embedded metal flashing. Certain components as depicted in these details may not be provided by the roofing contractor.