Performance versus prescriptive specifications · Lesson 2 of 4

Performance versus prescriptive specifications: materials, standards and design constraints

ES-1 as a test standard and the loads in RE-3, why it sets no safety factor, what installed as tested means, how the building code uses it, and ED-1 on thickness for flatness and thermal movement.

You will be able to: Say what ES-1, ED-1 and the building code each do for roof edge metal, which ES-1 test a coping needs, and which rules about thickness and movement are prescriptive.

10 min · 11 slides · 7 questions

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Slide 1 of 11

ES-1 is a test, not a design method

ANSI/SPRI/FM 4435/ES-1, approved November 21, 2022, provides the basic requirements only for resistance testing of roof edge systems under simulated wind load.

It applies to low-slope roofs, which it defines as roofs at or less than 2:12 (9.5 degrees).

Sources

ANSI/SPRI/FM 4435/ES-1 Test Standard for Edge Systems Used with Low Slope Roofing Systems (approved November 21, 2022; free read-only copy) - SPRI (Single Ply Roofing Industry)

Glossary

ES-1: ANSI/SPRI/FM 4435/ES-1, the test standard for roof edge systems on low-slope roofs, giving the tests RE-1, RE-2 and RE-3 under simulated wind load.
ED-1: ANSI/SPRI ED-1, the design standard for edge systems on low-slope roofs, covering wind load design, thickness for flatness, thermal movement and corrosion.
Exposed horizontal component: The part of a roof edge system that lies flat across the top of the edge; ES-1 sends one over 4 inches to the RE-3 test.
Cleat: The strip fastened to the substrate that an edge cover engages; ED-1 says a linear edge component is not to be tightly crimped or fastened to it.