Washington · Aluminum shingles
Aluminum shingles in Washington
Aluminum shingles are stamped aluminum roofing panels that don't rust, because there is no steel inside them. Interlock® aluminum shingles interlock on all four sides with the fasteners concealed, are made in North America, and are installed in Washington by our own company.
Reviewed by Scott Plumptree, Director of Marketing, The Interlock Group · Updated October 7, 2026
Thickness
0.019 to 0.0276 inch
Base-metal aluminum, by profile (ICC-ES ESR-1790).
Weight
About 0.41 to 0.59 lb/sq ft
Installed, by profile (ICC-ES ESR-1790).
Finish
30 Year Alunar® Coating Warranty
PVDF coating system (AAMA 2605).
What makes an aluminum shingle different
An aluminum shingle is a stamped aluminum panel with a baked finish. Unlike a steel shingle, there is no steel core under the finish, so there is nothing to rust if the finish is scratched or cut. The exposed aluminum forms an oxide film that blocks further oxidation (ASM International).
Interlock® aluminum shingles lock to each other on all four sides. The fasteners sit under the course above, out of the weather, so the roof has no exposed screw heads and no rubber washers to age.
Specifications
| Item | Specification |
|---|---|
| Base metal | Aluminum alloy per ASTM B209 (3105-H24 for the shingle and slate profiles) |
| Base-metal thickness | 0.019 inch (Slate, Cedar Shingle); 0.0276 inch (Shake, Mediterranean Tile), per ICC-ES ESR-1790 |
| Installed weight | About 0.41 lb per sq ft (Slate, Cedar Shingle), about 0.58 lb per sq ft (Shake) and 0.59 lb per sq ft (Tile), per ICC-ES ESR-1790 |
| Code evaluation | ICC-ES ESR-1790 (International Building Code and International Residential Code), covering the shingle, slate, shake and tile profiles |
| Finish | Alunar® PVDF coating system (AAMA 2605); 30 Year Alunar® Coating Warranty |
| Wind | Warranted to 120 mph when installed to manufacturer specification |
| Fire | Class A Fire Rated Available, as a complete assembly (two layers of GAF VersaShield® over 15/32-inch plywood, per ASTM E108 / UL 790) |
| Minimum slope | 3/12 |
| Material warranty | Guardian Lifetime Limited Material Warranty: material and finish, for as long as the original purchaser owns the home, transferable once |
| Made | In North America, by Interlock Roofing at its plant in Delta, BC |
Sources: ICC-ES ESR-1790 (reissued September 2025) and Interlock Roofing technical specifications. Read the full warranty before you sign.
Aluminum shingles on homes in Washington
Recent jobs in Washington, newest first. Tap a roof to see all of its photos.
Hunter Green Cedar Shingle · University Place, WA · 2 photos
Black Slate · Ocean Shores, WA
Black Slate · Redmond, WA · 12 photos
Deep Charcoal Slate · Lynnwood, WA
Black Cedar Shingle · North Bend, WA · 5 photos
Musket Grey Cedar Shingle · Shelton, WA · 3 photos
Copper Penny Slate · Castle Rock, WA · 14 photos
Deep Charcoal Slate · Vancouver, WA
Profiles and colors
Slate is the most popular profile. Cedar Shingle and Shake give a wood look without rot or splitting; Mediterranean Tile suits Spanish and Italianate homes. Nine colors: Solid Copper, Copper Penny, Hunter Green, Black, Deep Charcoal, Musket Grey, Tile Red, Colonial Brown and Tudor Brown.
On homes in Washington in our job book: Original Shingle 1,216 (the first Interlock profile, no longer made), Slate 698, Cedar Shingle 144, Mediterranean Tile 622 and Shake 251.
Aluminum shingles in Washington weather
Rain
The panel absorbs no water and can't rot, so months of rain have nothing to soak, unlike cedar or the mat of an asphalt shingle. Interlocked courses leave no tab for wind-driven rain to get under.
Moss
Moss holds moisture and debris against a roof and can lift asphalt shingles (Oregon State University Extension). It can settle on any shaded roof, aluminum included, but there is no wood to rot and no tab to lift; keep the roof and gutters clear.
Salt air
With no steel inside, salt spray on Puget Sound and the coast has no steel core to rust.
Snow and ice
Aluminum sheds snow; snow guards go where a slide would land on people, decks or cars, planned at the estimate. No roof stops ice dams on its own: they come from heat loss and ventilation, and ice damming is a stated exclusion of the material warranty.
Questions, answered
What are aluminum shingles?
Aluminum shingles are roofing panels stamped from aluminum sheet and finished with a baked coating, made to look like slate, cedar shingle, shake or tile. Interlock® aluminum shingles interlock on all four sides with concealed fasteners.
Do aluminum shingles rust?
No. Aluminum forms a thin oxide film that blocks further oxidation, and there is no steel inside an aluminum shingle to rust. That is why they suit waterfront and coastal homes in salt air.
Are aluminum shingles better than steel shingles?
Aluminum doesn't rust and is about one-third the density of steel. Steel shingles usually cost less up front and depend on their zinc or aluminum-zinc coating to keep from rusting. Aluminum can dent under large hail.
How thick are Interlock aluminum shingles?
The Slate and Cedar Shingle profiles are 0.019-inch base-metal aluminum; Shake and Tile are 0.0276 inch, according to ICC-ES Evaluation Report ESR-1790. The alloy meets ASTM B209.
How much do aluminum shingles weigh?
About 0.41 lb per square foot installed for the Slate and Cedar Shingle profiles, and about 0.58 to 0.59 lb for Shake and Tile (ICC-ES ESR-1790). Natural slate and concrete tile weigh many times that.
Where can I get aluminum shingles installed in Washington?
Interlock Metal Roofing (PNW) Inc. installs Interlock® aluminum shingles from our Seattle, Bellingham and Stanwood offices, serving Washington statewide, with 3,219 roofs completed in Washington since 1997. Call (206) 589-8423.
Can aluminum shingles be installed over asphalt?
A single layer of asphalt can be roofed over only if our inspection finds it suitable. Cedar shakes, concrete tile and natural slate always come off first.
What colors do aluminum shingles come in?
Interlock® offers nine: Solid Copper, Copper Penny, Hunter Green, Black, Deep Charcoal, Musket Grey, Tile Red, Colonial Brown and Tudor Brown, with a 30 Year Alunar® Coating Warranty on the finish.
Sources
- ICC-ES Evaluation Report ESR-1790, Interlock Roofing, reissued September 2025 (PDF)
- Interlock Roofing: aluminum shingles, technical specifications
- J.R. Davis, "Aluminum and Aluminum Alloys", Alloying: Understanding the Basics, ASM International (2001)
- Guardian Lifetime Limited Material Warranty (full document, PDF)
Product specifications are the manufacturer's (Interlock Roofing). Install counts are from our own job book. Reviewed by Scott Plumptree, October 7, 2026.
Related guides
- Aluminum roofing in Washington
- Metal shingles: a buyer’s guide
- Steel vs aluminum roofing
- Metal roof vs asphalt shingles
- Metal roof cost in Washington (2026)
- Metal roof warranties explained
Where we install in Washington
- Seattle, WA
- Tacoma, WA
- Vancouver, WA
- Bremerton, WA
- Everett, WA
- Kent, WA
- Oak Harbor, WA
- Olympia, WA
- Renton, WA
- Federal Way, WA
- Lynnwood, WA
- Bellevue, WA
- Puyallup, WA
- Auburn, WA
- Lakewood, WA
- Bellingham, WA
- Port Orchard, WA
- Marysville, WA
- Bothell, WA
- Sequim, WA
- Arlington, WA
- Shoreline, WA
- Snohomish, WA
- Edmonds, WA
- Gig Harbor, WA
- Des Moines, WA
- Lacey, WA
- Spanaway, WA
- Redmond, WA
- Camano Island, WA
- Stanwood, WA
- Kirkland, WA
- Poulsbo, WA
- Silverdale, WA
- Mount Vernon, WA
- Issaquah, WA
- Lake Stevens, WA
- North Bend, WA
- Port Angeles, WA
- Shelton, WA
Get aluminum shingles priced.
A written price after your roof consultation, at your home or on Zoom. Interlock Metal Roofing (PNW) Inc. · 5608 17th Ave NW, Suite 1574, Seattle, WA 98107-5232 · 2219 Rimland Dr, Suite 301, Bellingham, WA 98226-8660 · 26910 92nd Ave NW, Suite 425, Stanwood, WA 98292
