Supply and apply double layer EPDM (HERTALAN or approved equivalent) minimum 3 + 4mm water proofing material to grrn roof including barrier against Root Penetration of approved quality on top of roof slab with mineral surface finish for the second layer 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 double layer EPDM (HERTALAN or approved equivalent) minimum 3 + 4mm water proofing material to planter box including barrier against Root Penetration of approved quality on top of roof slab with mineral surface finish for the second layer 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)