Supply and apply single layer EPDM (HERTALAN or approved equivalent) minimum 4mm thick water proofing material to green roof including barrier against Root Penetration of approved quality to vegetation as per the detail drawing. Price shall include one coat prime and surface preparation as per supplier’s specification and all the necessary work thereto.(Rate only item) Supply and apply single layer EPDM (HERTALAN or approved equivalent) minimum 4mm thick water proofing material to planter box including barrier against Root Penetration of approved quality to vegetation as per the detail drawing. Price shall include one coat prime and surface preparation as per supplier’s specification and all the necessary work thereto. (Rate only item)