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Appendix B.4 Construction Specifications for ESD Practices Appendix B.4. Construction Specifications for Environmental Site Design Practices B.4.1 Supp. 1B.4.A Green Roof Specifications 1. Material Specifications Because there is significant variation in green roof assemblies and methods, providing comprehensive specifications is not feasible. Material specifications for green roofs will vary based on each roofing system and specific information should be obtained from the appropriate manufacturer or retailer. The following information and specifications, which include acceptable materials for generic applications, is not exclusive or limiting. 2. Planting Media Planting media should be a soil-like mixture with an organic content of 15% or less. The grain size distribution is necessary for to attain proper moisture content, permeability, nutrient management and non-capillary porosity, and soil structure. Grain size guidelines vary for single and dual media green roof assemblies. The pl...