The short answer: Job WAEV25002 is a Black Interlock aluminum slate roof installed on a single-story ranch home in Redmond, Washington, completed 2026-01-29 and documented in 12 photographs. It is a concealed-fastener, four-sided interlocking aluminum system on a complex hip roof with skylights, warranted for life to the original owner.
The roof this house actually had
The house is a gray Eastside ranch with a red front door — low, wide, and roofed with a hip that breaks into several planes, plus skylight curbs cut through the field. That geometry is the whole story. Hips, valleys and curbs are where an asphalt roof gives out first: every plane change is a seam, every skylight is a penetration, and every penetration around Puget Sound spends the wet season damp. A roof like this one does not fail evenly. It fails at its details.
An interlocking system answers the geometry rather than fighting it. Each aluminum panel locks to its neighbors on all four sides, so the field is continuous instead of a stack of overlapping tabs, and every fastener sits concealed under the next course. There are no exposed fastener heads on the surface to weather, back out, or admit water at a skylight curb.
What the panels are
The material is 3105-H24 / 3003-H24 aluminum to ASTM B209, at roughly 95% recycled content, pressed into the slate profile and finished with an AAMA 2605 70% PVDF Alunar® coating. Aluminum contains no iron, so it cannot rust — a distinction that matters more the closer a home sits to salt water, and one that holds equally well on the Eastside, where the problem is rain volume rather than salt.
The engineering is published, not asserted:
- ICC-ES ESR-1790 — evaluated wind uplift resistance to 177.5 psf.
- UL 2218 Class 4 — the top impact classification in that standard.
- ASTM B209 — the aluminum sheet specification the panels are made to.
- AAMA 2605 — the 70% PVDF coating specification, warranted 30 years.
- Class A fire rating available — achieved as an assembly under ASTM E108 with GAF VersaShield® underlayment per ICC-ES ESR-2053. It is assembly-dependent, never a property of the panel alone.
What the homeowner in Redmond gets
A Black slate profile reads as quarried stone from the street and weighs a small fraction of it, so no structural reinforcement is involved. Past the look, the practical result is that the maintenance calendar goes away: nothing on the surface holds moisture for moss to root into, and there is no annual treatment cycle to keep up with on the shaded north planes.
Warranty terms, stated plainly: the Guardian Lifetime Limited Material Warranty runs for life to the original owner, transfers once, and covers the second owner to 50 years from substantial completion.
Redmond sits in King County, served from our Seattle office at 5608 17th Ave NW, Suite 1574, Seattle, WA 98107-5232.
See the record
Every Washington installation we publish is a real job with a real number attached. WAEV25002 is one of 215 documented photographs in the gallery; the wider record is in proof and in what Washington homeowners have written. If you want the material case in full, start with aluminum roofing; if you want to know what drives the number on your own roof, the cost page explains the variables and a written estimate supplies the figure.
