ICC-ES ESR-1790: How Interlock Meets the Building Code
Quick answer
ICC-ES ESR-1790 is the independent evaluation report confirming Interlock's metal roof panels and shingles comply with the International Building Code and International Residential Code. Issued by ICC Evaluation Service, it documents fire classification, wind-uplift resistance up to 177.5 psf, and weather resistance — giving building officials a recognized basis to approve your roof.
What is an ICC-ES evaluation report?
When a building inspector reviews a roof, they need proof it genuinely meets code — not just a brochure claim. An ICC-ES Evaluation Service Report provides that. ICC Evaluation Service is a subsidiary of the International Code Council, which writes the model building codes used across the United States, and it is accredited by the ANSI National Accreditation Board. An ESR is an independent technical opinion that a specific product complies with named code sections, and code officials treat these reports as trusted evidence for approval. ESR-1790 was most recently reissued in September 2025 and is subject to renewal in September 2026, so it reflects current code editions.
What does ESR-1790 cover for Interlock?
ESR-1790 evaluates Interlock's full metal roofing family — held by Interlock Roofing Ltd. of Delta, BC — against the 2021, 2018, 2015, 2012 and 2009 editions of the IBC and IRC, plus the 2022 and 2025 California Green Building Standards Code for reduced-maintenance attributes. It covers the Shingle and Diamond shingles and the Shake and Hidden Fastener Tile panels, in aluminum (3105-H24 / 3003-H24) and steel (A653 G90 / A792 AZ50), verifying roof-covering fire classification, wind-uplift resistance, and weather resistance under acceptance criteria AC166.
How strong is the wind-uplift rating?
ESR-1790 publishes allowable uplift loads for each profile and fastening system, so a designer can match the roof to local wind requirements determined under IBC Section 1609 or IRC Section R301.2.1. The aluminum Shingle and Diamond profiles are rated up to 177.5 psf with two clips and three nails per panel; the Hidden Fastener Tile reaches 142.5 psf; and the Shake panels reach 115 psf. Lower-fastener systems carry lower allowable loads, and the required system for a given roof depends on its design wind pressure.
Is an Interlock roof fire rated?
Metal is noncombustible, but a roof's fire class depends on the whole assembly, not just the panel. Under ESR-1790, Interlock shingles and panels are classified as Class A or Class B roof coverings when the assembly incorporates GAF VersaShield fire-resistant deck protection (covered by ICC-ES ESR-2053). Class A is the highest roof-covering fire classification in the code. When installed with a self-adhered underlayment instead, the assembly is treated as nonclassified, so your installer selects the assembly your local code requires.
Frequently Asked Questions
What is ICC-ES ESR-1790?
ESR-1790 is an evaluation report from ICC Evaluation Service confirming that Interlock's metal roof panels and shingles comply with the International Building Code and International Residential Code. It documents fire classification, wind-uplift resistance, and weather resistance, giving building officials a recognized basis to approve a permit.
Does an ICC-ES report help me get a building permit?
Yes. Building officials across the U.S. accept ICC-ES evaluation reports as evidence a product meets code. Providing ESR-1790 to your building department gives the inspector the third-party documentation needed to approve an Interlock roof, which can smooth and speed permitting.
How much wind uplift can an Interlock roof resist?
ESR-1790 lists allowable uplift loads by fastening system: the aluminum Shingle and Diamond profiles up to 177.5 psf, Hidden Fastener Tile up to 142.5 psf, and Shake up to 115 psf. Your designer selects the system that meets local wind requirements.
Is an Interlock roof Class A fire rated?
Under ESR-1790, Interlock panels and shingles are classified as Class A or Class B roof coverings when the assembly incorporates GAF VersaShield deck protection (ICC-ES ESR-2053). Metal is noncombustible; the underlayment assembly determines the roof-covering fire class.
Sources
- ICC Evaluation Service — Evaluation Report ESR-1790 — Reissued September 2025
- ICC-ES — Evaluation Reports Program — Program overview
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Last reviewed 2026-07-11 · Reviewed by Scott Plumptree, Director of Marketing