Build the roof drain and overflow takeoff review record
Build the count from roof plans, plumbing plans, risers, details, and roof schedules. Record each drain type, size, location, sump or body condition, overflow relationship, and connected piping route.
Resolve count differences between disciplines before extending cost. Use the plumbing fixture takeoff review as a related control, but keep this takeoff tied to its own drawing population and cost lines.
Check quantities and scope conditions
Review drain bodies, domes, clamping rings, sumps, insulation kits, heat tracing, strainers, and accessories only when the documents support them. Keep roof openings, blocking, flashing, and patching assigned to the proper package.
AACE recommended practices provide general estimating references. The project documents and approved estimate basis control the actual quantity and scope decisions.
| Review field | Required record |
|---|---|
| Population | Location, type, and source |
| Quantity | Measured basis and unit |
| Interface | Included work and package owner |
| Disposition | Estimate treatment and reviewer |
Reconcile the estimate before release
Trace each primary and overflow path to its discharge point. Reconcile horizontal leaders, vertical conductors, cleanouts, supports, insulation, testing, and exterior discharge work so a counted roof drain does not sit apart from its downstream cost. Close open assignments through the mep scope interface matrix and preserve the decision with the estimate revision.
