Proof · Primary documents

Don't take our word for it. Read the documents.

Every product claim on this site traces back to a warranty, a code evaluation or an independent listing. Each one is hosted here, in full and unedited.

Product documents courtesy of Interlock Roofing, the manufacturer; some are issued to Delta Building Products. They are also published at interlockroofing.com. Contractor licenses are the installer's: the license and the contract come from the certified Interlock installer assigned to your project.

Warranty

Guardian Lifetime Limited Material Warranty

Issued by Interlock Roofing, the manufacturer. Covers the material and its factory finish for the life of the original purchaser while they own the home. Transferable once: the next registered owner is covered to 50 years from substantial completion (proof of purchase within 60 days; $300 fee). The Alunar® coating is warranted for 30 years. Wind resistance is warranted to 120 mph when installed to manufacturer specification, and splitting, cracking and perforation from hailstones 1.5 inches or less are covered. Workmanship is not covered; it comes from your installer.

Original purchaser, while they own the home
One transfer: 50 years for the next owner
120 mph, installed to manufacturer specification
Hail to 1.5 inches (splitting, cracking, perforation)

Read the full warranty (PDF)The warranty, summarized →

U.S. building code

ICC-ES Evaluation Report ESR-1790

The International Code Council Evaluation Service report on the Interlock® aluminum Shingle and Diamond roof shingles and the Shake and Hidden Fastener Tile panels, for the 2009 through 2021 International Building Code and International Residential Code: roof covering fire classification, wind uplift resistance and weather resistance. The aluminum is 3105-H24 or 3003-H24 alloy to ASTM B209, with installed weights of 0.41 to 0.59 pounds per square foot. Standing seam is not part of the report. The hosted copy was reissued in September 2025 and states that it is subject to renewal in September 2026; check icc-es.org for the current version.

IBC & IRC, 2009–2021
Reissued September 2025
Renewal date stated: September 2026

Read ESR-1790 (PDF)

Fire

Class A Fire Rated Available, as a complete assembly

Under section 4.4 of ESR-1790, the shingles and panels are classified as Class A or Class B roof assemblies when the assembly incorporates GAF VersaShield® Fire-Resistant Roof Deck Protection installed in accordance with ICC-ES evaluation report ESR-2053. Installed over a self-adhered underlayment, the assembly is a nonclassified roof covering. The rating belongs to the assembly, not to the panel on its own, so ask the installer which assembly their proposal specifies.

ESR-1790 §4.4
With GAF VersaShield® per ESR-2053
Assembly rating, not panel

Read section 4.4 in ESR-1790 (PDF)

Impact / hail

UL 2218 Class 4, verified by Intertek

Class 4 is the highest impact-resistance class under UL 2218. Intertek's listing (SPEC ID 33876) for Delta Building Products records the Class 4 rating, under UL 2218 (2012), on the deck configuration it describes: nominal ½-inch APA-rated plywood over 2×4 framing, one layer of RoofTopGuard II underlayment, and the product installed to the manufacturer's instructions. For Interlock®, that covers the Slate, Cedar Shingle, Shake and Mediterranean Tile profiles. Ask your carrier whether an impact rating affects your policy.

Class 4, UL 2218 (2012)
Intertek SPEC ID 33876
Slate · Cedar Shingle · Shake · Mediterranean Tile

View the Intertek listing (PDF)

Finish

The Alunar® finish

ESR-1790 describes the finish as a fluorocarbon paint at a minimum of 1.0 mil on the weather surface and 0.5 mil on the underside. The Guardian warranty covers the Alunar® coating for 30 years from substantial completion against chalking beyond a rating of 8 (ASTM D-4214) and fading or color change beyond 5 Hunter ΔE units (ASTM D-2244), under normal atmospheric conditions; corrosive, aggressive or industrial atmospheres are excluded.

Fluorocarbon, 1.0 mil minimum
30-year coating warranty
Measured limits: ASTM D-4214 · D-2244

For architects, builders & inspectors

Specification manuals

The manufacturer's installation specifications for the profiles offered in Texas: dimensions, fastening, flashing details and installation standards.

Slate & Cedar Shingle

Installation specification manual

Open PDF →

Shake

Installation specification manual

Open PDF →

Mediterranean Tile

Installation specification manual

Open PDF →

Want these documents applied to your own roof?

Request a quote and a certified Interlock installer is assigned to your project. Ask which profile, assembly and fastening their written proposal specifies.

Request a quote 1-866-733-5811

Metal Roofing Texas is operated by Interlock Roofing of America, which is not a contractor and does not install roofs; installation is performed by independent, manufacturer-certified Texas installers who contract directly with you. Texas issues no state roofing license: ask any contractor for their certificate of insurance and city registration.