Architectural Flashing Supply
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Peer review and constructability · Lesson 2 of 4

Peer review and constructability: materials, standards and design constraints

Edge-metal tests RE-1 to RE-3 and the building code, expansion-joint intervals in a federal guide spec, thermal movement by metal from the AFS register, dissimilar metals, and where AFS's piece length, flat width and bend limits sit against all of them.

You will be able to: Name what a reviewer measures a flashing detail against: the edge-metal tests in the building code, joint intervals in a federal guide spec, each metal's expansion, dissimilar-metal contact, and AFS's fabrication limits, with the source of each value.

11 min · 12 slides · 8 questions

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Slide 1 of 12

Edge metal and the building code

Section 1504.6 of the 2021 International Building Code, as SPRI quotes it, covers metal edge systems, except gutters and counterflashing, on built-up, modified bitumen and single-ply roofs with a slope under 2:12.

They must be designed for Chapter 16 wind loads and tested for resistance to Test Methods RE-1, RE-2 and RE-3 of ANSI/SPRI ES-1.

Sources

Glossary

ES-1
ANSI/SPRI/FM 4435/ES-1, the edge-systems wind test standard whose methods RE-1, RE-2 and RE-3 the International Building Code calls for on metal edge systems of low-slope membrane roofs. SPRI presentations describe the methods; the standard governs.
RE-3
The ES-1 test for coping caps: face and top loads applied together at 1.73 vertical to 1.00 horizontal until failure, then repeated with loads on the back and top, as SPRI describes it.
Expansion joint (in sheet metal)
A deliberate break between lengths of continuous sheet metal that lets thermal movement happen without damage. UFGS 07 60 00 asks for them at most 32 ft apart for aluminum and 40 ft for other metals, as a federal guide-spec example.
Coefficient of thermal expansion
How much a metal grows per unit of length per degree of temperature rise. The AFS material register lists galvanized steel at 6.5 millionths per degree F, the lowest of the five metals taught here, and aluminum at 12.9.
Dissimilar metals
Different metals in contact. UFGS 07 60 00 says such contact must be avoided and asks for bituminous paint or moistureproof felt separation on copper-bearing contact surfaces.