New Standard in Water Control

Required by building code in 21 states and locally in 4 states.

*Local jurisdictions, no state-wide code.

What is ANSI/SPRI GT-1?

• Like ANSI/SPRI/FM 4435/ES-1 is to fascia and coping, ANSI/SPRI GT-1 provides a standard test method for load resistance for gutter systems that secure membrane on commercial low slope roof systems.

• Became a standard in 2016.

• Adopted into the 2021 International Building Code.

• Located in Chapter 15: Roof Assemblies and Rooftop Structures.

• Design/wind load calculations based on ASCE 7, Minimum Design Loads and Associated Criteria for Buildings and Other Structures.

• Three Test Methods: G-1 (Horizontal Pressure), G-2 (Vertical Pressure), and G-3 (Water/Ice/Snow Load).

• GT-1 testing is specific to a product’s components, materials, dimensions, fasteners, and fastening patterns.

GT-1 Test Methods