Scope and inputs to reconcile
Identify roof drains, horizontal collectors, vertical leaders, site connections and any storage/treatment interfaces included in the package.
Workflow and checks
Reconcile roof plans with risers and civil discharge details. Measure size/material changes and clarify the trade handoff before adding site pipe or structures.
What the output should show
Output quantities by network with drain counts, discharge locations and unresolved routing/elevation assumptions.
Exclusions and unresolved decisions
Rainfall design, pipe sizing and stormwater approval are not takeoff calculations. Do not assume a roof network includes all site drainage.
Documents to share for a quote
Send roof/riser/civil sheets, storm specifications and the utility handoff definition.