ICC-ES ESR-1790

ESR-1790 recognizes Interlock® metal roof shingles and panels as code-compliant under the 2021, 2018, 2015, 2012 and 2009 International Building Code® (IBC) and International Residential Code® (IRC), plus the California Green Building Standards Code (CALGreen, Title 24, Part 11). The report holder is Interlock Roofing Ltd. (9969 River Way, Delta, BC). It was reissued September 2025 and is subject to renewal September 2026. ICC-ES evaluated three properties — roof-covering fire classification, wind-uplift resistance, and weather resistance — across the Shingle, Diamond, Shake and Hidden Fastener Tile profiles in aluminum and steel.

ESR-1790 — verified product data (source: ICC-ES ESR-1790, reissued Sept 2025)

Report holder	Interlock Roofing Ltd., Delta, BC, Canada
Codes	2009–2021 IBC & IRC; CALGreen Title 24, Part 11; 2022 CBC/CRC (CA supplement)
Properties evaluated	Fire classification · wind-uplift resistance · weather resistance
Aluminum — Shingle/Diamond	3105-H24 alloy (ASTM B209), 0.019 in base metal · 0.41 psf installed
Aluminum — Shake/Tile	3003-H24 or 3105-H24 alloy, 0.0276 in base metal · ~0.58–0.59 psf installed
Exterior coating	Fluorocarbon (PVDF) paint, ≥ 1.0 mil on the top surface
Fire classification	Class A or Class B assembly with GAF VersaShield® (per ICC-ES ESR-2053)
Minimum roof slope	3:12 with code-compliant self-adhered underlayment
Re-roofing	May be installed over existing asphalt-shingle roofs (per code)

Allowable wind-uplift load (Tables 1–3)

The maximum allowable uplift load depends on the fastening system used; the highest-rated system for each product is:

Product	Max. allowable uplift load
Shingle & Diamond shingles (aluminum/steel)	up to 177.5 psf
Shake panels (aluminum/steel)	up to 115.0 psf
Hidden Fastener Tile panels (aluminum/steel)	up to 142.5 psf

Read the report

Verify directly at the official ICC-ES listing · report PDF. Related: UL 2218 Class 4 · Florida FL7263-R7.