Base counterflashing and reglet fabrication · Lesson 4 of 4

Base counterflashing and reglet fabrication: defects, verification and case study

The recurring defects and which ones start in the shop, correct and incorrect details, sealant and fasteners, shop and field checks, and a case study from diagnosis to remake.

You will be able to: Tell shop defects from site defects in a regleted counterflashing, inspect a formed piece against the order, diagnose a flange that does not match the reglet and a short lap, and document the evidence and the fix.

10 min · 11 slides · 7 questions

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Slide 1 of 11

The recurring defects

The problems Levine lists in regleted counterflashing:

laps too short
exposed fasteners
reglets too shallow
missing hook dams
ledges that send rainwater back into the wall
the wrong material
reglets cut too low, or through the base flashing
reglets sloped in toward the wall

Sources

Anatomy of a regleted counterflashing (Jeffrey S. Levine), Professional Roofing, November 2022 - National Roofing Contractors Association (Professional Roofing)

Videos for this lesson

What this video shows: One contractor sets flat-roof wall flashings into a 3/4 in reglet already cut into the mortar with a grinder and diamond blade. That reglet is this contractor's choice, not a standard, and the cut makes silica dust.

Video: Flat Roof - How to Install Wall Flashings by Schoen Roofing, on YouTube. Chosen from the video's published description.

Glossary

Ledge: The part of a reglet flange that projects from the wall face when the flange is longer than the reglet is deep; Levine warns it can pond water or send it into the wall.
Hook dam: Levine: the hook at the back end of the reglet flange, which impedes stray moisture.
Exposed fastener: A fastener left visible through the face; Levine says a properly detailed counterflashing has none.
Defect record: What was found, the value and source it misses, the fix and the check that proved it.