Major commercial project coordination · Lesson 4 of 4

Major commercial project coordination: defects, verification and case study

Where coordination fails at the roof edge: building to the drawing instead of the wall, untested edge metal, height and sequence misses, mockups and changed submittals, added loads, and the checklist, case study and evidence log.

You will be able to: Diagnose a coordination defect at the roof edge, list the corrective options, and document the evidence a reviewer needs, using sourced checks rather than assumptions.

10 min · 11 slides · 7 questions

All lessons in this module

Slide 1 of 11

Where problems enter the paper trail

SPRI's presentation cites an FM Global study of losses involving built-up roofs (BUR): 59% occurred because the roof perimeter failed.

The study covered built-up roofs only and is cited from a 2005 FM Global publication, so it is a reason to care about the perimeter, not a rate for other roof systems.

The next slides follow the ways the paper trail goes wrong at the edge.

Sources

Perimeter Edge Metal Systems for Low-Slope Roofing (2023 presentation, reproducing IBC text and ES-1 history) - SPRI (Single Ply Roofing Industry)

Glossary

Field measurement: A dimension taken from the built work itself before shop fabrication, so a piece fits the wall as built rather than as drawn; OGS asks for field measurements for accurate fit.
Evaluation report: A report from an agency acceptable to the authority having jurisdiction showing that a coping or roof edge flashing complies with ANSI/SPRI/FM 4435/ES-1, as OGS asks for.
Positive drainage: Slope that carries water away from a flashing instead of toward it; the SUCF agenda asks it to be confirmed where a termination is less than eight inches above the field membrane.
Temporary water cutoff: A temporary closure of unfinished roofing at the end of the work day, which the SUCF pre-roofing agenda asks the meeting to discuss.