Decking · PVC decking (cellular PVC)
How long does PVC decking last?
TimberTech's own literature estimates PVC decking at "50 years, or more," and the product warranty behind it is written as a lifetime term. Both of those are forecasts rather than records: cellular PVC decking has only been on sale since the mid-2000s, so no PVC deck anywhere has yet lived long enough to test either number.
Updated
The gap: the paper says “Lifetime” — "Lifetime" here is defined as the lifetime of the product, not of the owner or the house — and 20 years flat for anyone who is not a single-family homeowner. What it covers is narrow: defects arising from the manufacturing process that go on to cause splitting, cupping, splintering, blistering, peeling, flaking, cracking, rotting or termite and fungal damage. Colour change, normal weathering of the surface, scratches, nicks, dents, other aesthetic conditions and ordinary wear and tear are each excluded by name, as is damage from reflected sunlight off low-emissivity glass. Fade and stain are a separate document with a 50-year term on most collections and 35 on Solstice. One transfer is allowed and only within five years of the original purchase. The remedy is repair, replacement boards or a refund of the purchase price — labour, removal and freight are excluded. Typical service life is still 50+ years. Warranty document (TimberTech, checked 2026-08-27)
Typical service life: 50+ years
The manufacturer's phrasing is "The average PVC decking lifespan is estimated to be 50 years, or more" — its own estimate for its own product, and the only published figure specific to this material. The oldest cellular PVC decks are roughly twenty years old, so the 50 is a projection and the 70 here only bounds the drawing, not the claim. No independent chart or trade-association study carries a PVC decking row at all.
Tier 1 · manufacturer document Range from TimberTech (AZEK Building Products) — PVC or Composite Decking Lifespans, checked 2026-08-27.
PVC's weakness is not rot but heat: it takes on none of the moisture that ends wood decks and none of the mould that reaches a composite's wood flour, and instead answers to temperature. In sustained southern sun a dark board runs hot enough to feel it barefoot and moves measurably every day, which is why gapping instructions are written as warranty conditions. In cold climates it is the winter that shows up — the material gets more brittle as it gets colder, and impacts that would dent a summer board can chip one.
What the warranty paper actually says
TimberTech (Advanced PVC Decking Lifetime Limited Warranty (Vintage, Landmark, Harvest, Harvest+, Solstice)) publishes a “Lifetime” limited, transferable, conditional warranty. "Lifetime" here is defined as the lifetime of the product, not of the owner or the house — and 20 years flat for anyone who is not a single-family homeowner. What it covers is narrow: defects arising from the manufacturing process that go on to cause splitting, cupping, splintering, blistering, peeling, flaking, cracking, rotting or termite and fungal damage. Colour change, normal weathering of the surface, scratches, nicks, dents, other aesthetic conditions and ordinary wear and tear are each excluded by name, as is damage from reflected sunlight off low-emissivity glass. Fade and stain are a separate document with a 50-year term on most collections and 35 on Solstice. One transfer is allowed and only within five years of the original purchase. The remedy is repair, replacement boards or a refund of the purchase price — labour, removal and freight are excluded.
The warranty document itself , checked 2026-08-27.
What shortens it
- Reflected sunlight concentrated by low-emissivity window glass, which can soften and distort a strip of PVC boards while the rest of the deck is untouched — and is excluded from every warranty in this category
- Fire pits, grills and dropped embers, against a material with a much lower heat tolerance than the wood it replaced
- Gapping and fastening that ignores the installation guide, on boards that move more with temperature than wood does
- Dark colours in full sun, which run hotter and work the board harder through every daily expansion cycle
- Abrasive cleaners, strong solvents and de-icing chemicals, which dull the cap the whole system depends on
Signs of wear to look for
- Boards bowing, waving or lifting off the fasteners in hot weather and settling back as they cool
- A localised bright or distorted patch tracking the reflection from a nearby window across the season
- Surface gloss going flat and chalky, most visible where the sun hits longest
- Scratches and scuffs staying visible indefinitely, because a solid polymer surface does not weather them away
- Colour drift between the open field of the deck and the strip permanently shaded by railings or furniture
PVC will not tell you anything about what is underneath it: an unmoving, unrotting surface can sit on a frame that is neither — that is an inspection question, not a web-page question.
Other decking materials
- Pressure-treated pine about 15 yrs
- Composite decking (wood-plastic) 8–25 yrs
- Western red cedar 15–25 yrs
- Redwood 10–30 yrs
- Ipe 25+ yrs