Fencing · Composite fence
How long does a composite fence last?
Trex says its composite fencing is "designed to last at least 25 years" and warrants it for 25 years — the same number, from the same company, for the estimate and for the contract. There is no trade association figure and no baseline chart entry to check it against, and that absence is the honest headline on this page.
Updated
The gap: warranty ends at 25 years; typical service life ends around 25+ years. The material typically outruns the paper by about 15 years. Warranty document (Trex, checked 2026-08-27)
Typical service life: 25+ years
The maker's phrasing is "designed to last at least 25 years" — a floor, and a design intent rather than a field observation; composite fencing has not been on the market long enough for anyone to publish an observed spread. The 40 here only bounds the drawing. What is worth knowing is that the parts age on separate clocks: the composite boards will not rot or feed termites, while the steel frame inside a horizontal-board system is a galvanized part with its own coastal limit, and the ground under the posts has no clock at all.
Tier 1 · manufacturer document Range from Trex Company — Trex Composite Fencing — how long do composite fences last, checked 2026-08-27.
Two climates matter to a composite fence and they are not the same one. Sun drives the fading the warranty measures at 5 Delta E and calls normal below that; salt drives the steel frame inside a horizontal system, which is why the maker draws a five-mile line at the coast. Freeze and thaw do little to the boards and a great deal to the ground the posts are standing in.
What the warranty paper actually says
Trex (Trex Fencing 25-Year Residential Limited Warranty) publishes a 25-year limited, transferable, conditional warranty. The 25 years are residential; a commercial installation gets 10. Inside the term the fence is warranted not to split, splinter, rot or take structural damage from termites or fungal decay, and separately against fading beyond 5 Delta E units and against permanent staining. It transfers once, and only inside the first five years from the original purchase date. The exclusions do the usual work — installation that departs from the maker's guidelines, movement or settling of the ground and supporting structure, acts of God, and "ordinary weathering," which means any fading that stays inside the warranted threshold. Salt water gets its own clause: where the atmosphere is influenced by salt water, failing to follow the cleaning guidelines voids coverage for anything that results, and the standard galvanized steel frame is not recommended within about five miles of salt water at all.
The warranty document itself , checked 2026-08-27.
What shortens it
- Movement and settling of the ground under the posts, which a rigid panel system telegraphs along a whole run and which the warranty excludes
- Salt air on a galvanized steel frame — the maker's own guidance keeps the standard frame away from sites within about five miles of salt water
- Mulch, soil or shoveled snow piled against the bottom board, holding water at the one edge that dries slowest
- Summer heat on a run installed tight in cold weather, with no room left for the boards to expand into
- Deep shade, where surface mold and algae take hold — conditions the warranty names as environmental rather than defective
Signs of wear to look for
- Boards bowing, or the gaps at the ends of a run closing up in summer heat
- Fading that has gone uneven between the sunny and shaded faces of the same fence
- Dark spotting or a green film settled into the grain texture on the shaded side
- Rust staining running down a board from a frame member or fastener rather than out of the board itself
- Boards loose in the rail channel, or a whole panel rocking on a post that has settled
Other fencing materials
- Wood fence (pressure-treated pine) about 20 yrs
- Vinyl fence (PVC) 100+ yrs
- Chain-link fence (galvanized) 20–70 yrs
- Aluminum fence (powder-coated) 25+ yrs
- Wrought iron fence 100+ yrs