Trace the water path
Drainage points and falls determine where water travels. Existing ponding, blocked outlets and cracks should be assessed before defining the waterproofing scope. A new membrane alone does not correct an unsuitable roof geometry.
Detail the junctions
Parapets, thresholds, penetrations and outlets need compatible details. Confirm which junctions and edge treatments are included. Removal, insulation and correction of falls are separate work items when required.
Record the handover
Agree the inspection method before installation and keep the material identification and maintenance instructions with the project documents. Performance requirements must match the designed system and the site conditions.