Windows · Aluminum-clad wood windows
How long do aluminum-clad windows last?
The baseline chart files aluminum and aluminum-clad windows together at 15 to 20 years — while putting plain wood at 30+, which is odd, because an aluminum-clad window is a wood window wearing an aluminum coat. Andersen's E-Series paper handles the tension better than the chart does: the cladding is warranted 20 years, the glass 20, and the wood underneath 10 years inside and 5 outside.
Updated
The gap: warranty ends at 20 years; typical service life ends around 20 years. The paper and the typical service life end together — an unusually honest term. Warranty document (Andersen, checked 2026-08-27)
Typical service life: 15–20 years
The chart carries a single row — "Aluminum/Aluminum-Clad, 15 to 20" — and the sentence introducing its window table describes that figure as the aluminum-window number ("Aluminum windows are expected to last between 15 and 20 years"). So a clad-wood window is riding on a range written for a different product, while the same chart's wood row says 30+. Both figures are printed on the same page and they do not agree. This page carries the row that actually names aluminum-clad, and flags the disagreement rather than quietly picking the flattering one.
Tier 3 · baseline chart (undated) Range from InterNACHI — Standard Estimated Life Expectancy Chart for Homes, checked 2026-08-27.
Salt distance is the number that decides this window, and the paper measures it in feet rather than in miles on a map. The other climate story is invisible by design: cladding sheds water beautifully and also hides whatever gets past it, so in wet and freeze-thaw climates the interior side of the sill is where a clad window tells the truth about itself first.
What the warranty paper actually says
Andersen (E-Series (aluminum-clad wood)) publishes a 20-year limited, transferable, conditional warranty. Three separate clocks, and the shortest one is the wood. The exterior painted aluminum is warranted twenty years not to crack, check, peel, flake, blister or lose adhesion — but on the standard 2604 coating, fade and chalking are covered only ten, with the upgraded 2605 fluorocarbon coating carrying twenty for both. The glass has its own twenty years against seal failure and material obstruction of vision. The wood under the cladding gets ten years for interior and exterior composite parts and five years for exposed exterior wood, and that only if every wood surface was sealed immediately on arrival and the finish has been kept up since. Near salt water the terms shrink: between two miles and 1,001 feet from the seashore the finish term is ten years, and inside 1,000 feet it is ten years paid at half from year six on — void unless the windows have been rinsed with fresh water at least every three months. A scratch that exposes the cladding must be repaired immediately or coverage lapses. It does travel with the property, transferring to a new owner for whatever term remains.
The warranty document itself , checked 2026-08-27.
What shortens it
- Water that gets in behind the cladding, where the wood is unseen and unventilated and rot can travel a long way before anything shows on the outside
- Salt air — the coastal terms begin two miles from the shore and tighten again inside 1,000 feet, with corrosion in that band treated as normal weathering rather than a defect
- Scratches and chips through the coating that expose bare cladding, which the warranty requires be repaired immediately to keep coverage alive
- Exposed wood at the edges, ends and joinery the cladding does not reach, left unsealed after installation
- Sealant aging at the cladding joints and at the perimeter, which is the usual way water reaches the wood in the first place
Signs of wear to look for
- Haze or film between the panes — the sealed glass unit, and on a clad window it is typically the first of the three terms anyone uses
- Chalky residue on a wiped rag and uneven fade between elevations, which the paper measures against a numeric scale rather than by eye
- Corrosion blooming at cut edges, at cladding joints and around exposed fasteners
- Dark staining or streaks at the sill-to-cladding joint, the low point where water collects and sits
- Interior wood at the sill or stool darkening or going soft while the exterior still looks nearly new — the tell that the cladding is hiding something
Soft wood or staining spreading out of the window opening into the wall below — framing, sheathing or the sill plate — is a question about the structure rather than the window: that is an inspection question, not a web-page question.
Other windows materials
- Vinyl windows 20–40 yrs
- Wood windows 30+ yrs
- Fiberglass windows 20–40 yrs