Roof, wall and foundation transitions · Lesson 4 of 4

Roof, wall and foundation transitions: defects, verification and case study

The defects that recur at roof-to-wall, coping-to-wall, eave-to-sidewall and wall-base transitions, what to inspect and record, and a fictional clinic case study that finds three of them and writes the corrections.

You will be able to: Diagnose the recurring transition defects, from a reroof that outgrows its receiver to a screed buried by landscaping, say what evidence verifies each, and work a fictional case study into a corrected schedule and a request-for-information log.

10 min · 12 slides · 6 questions

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Slide 1 of 12

A reroof outgrows the receiver

Hutchinson says that for a reroof, test cuts of the existing roof system should be taken so its composition and depth are known.

Hutchinson lists two options when insulation rises above existing through-wall flashing: raise the through-wall flashing, or design an interior gutter and leave the existing flashing in place.

Both are designer decisions, made from the test cuts.

Sources

The Integration of Roof and Brick Requires Concise Details, page 3 (T. W. Hutchinson, Roofing magazine, 21 November 2016) - Roofing magazine

Glossary

Test cut: A small opening cut in an existing roof so its layers and their depth can be seen before new flashing heights are set; Hutchinson says to take them at a reroof.
Saddle flashing: A formed piece set in sealant at the junction where a coping meets a taller wall, used with wall flashing and counterflashing so the coping is not simply butted to the wall (Building Enclosure, 2011).
Request for information (RFI): A written question sent to the designer of record about a condition that the drawings do not settle; here each transition defect becomes one, with measured values and datums attached.
Incompatible membranes: Roof and wall membranes that cannot be placed in contact; ABAA gives a separate detail family for connecting them.