Does composite decking fade? What happens in the first summer

Every composite deck changes colour in its first summer, and every year someone emails us in August convinced their boards are faulty. They are not. This guide explains what happens to the colour of a composite board, how much, how long it takes, why it is not the same as timber greying, and how to buy so the settled colour is the one you wanted.

The short answer

Yes, composite decking lightens slightly in its first three to six months outdoors, then holds. The change is usually one shade: a chocolate board settles to a warm brown, a black board to a charcoal, a grey to a slightly softer grey. After that first season the colour is stable for the life of the board, which is what the ten-year warranty covers. Capped boards change less; uncapped boards like ours change a little more and then stop. Buy for the settled colour, not the day-one colour.

What is actually happening

A wood-plastic composite is roughly half wood fibre. That fibre contains tannins, the same compounds that make a new fence weep brown in the rain. In the first months outside, sunlight and rain draw the surface tannins out and the pigment on the very top of the board bleaches a fraction. The result is a board that is slightly lighter and slightly less saturated than the one that came off the lorry. Once the surface tannins are gone and the top layer has weathered, there is nothing left to change, and the colour stays where it has settled.

Timber is different. Timber greys because ultraviolet light breaks down the lignin in the wood itself, and it keeps doing it forever. That is why timber needs oil every couple of years and composite needs nothing.

How much and how long

Colour	Day one	Settled (month six)
Black	Near-black	Deep charcoal
Chocolate	Dark brown	Warm mid-brown
Teak, red brown	Rich reddish brown	Softer, more orange-brown
Oak	Golden brown	Lighter honey
Grey, silver, ash	As boxed	Almost unchanged; the least visible shift

The darker the board, the more the shift shows. Greys barely move. Most of the change happens in the first eight to twelve weeks of summer sun; a deck laid in November settles the following spring. Boards under a table or a planter settle slower than the open deck, so move furniture around in the first season or accept a faint shadow that catches up over the following months.

Is it a fault?

No, and no manufacturer's warranty treats it as one, whether the board cost £25 or £90. Warranties cover structural failure, rot, splitting and insect damage, and most exclude "natural weathering in the first months". What would be a fault is a board that keeps lightening year after year, or that changes in patches unrelated to sun and shade. That does not happen with a properly made composite.

Uncapped against capped

Our boards are uncapped: the composite runs right through. They settle by about one shade. Capped boards have a thin plastic shell with UV stabilisers in it and settle by less, perhaps half a shade, at two to three times the price. If the deck is a south-facing showpiece and a subtle colour shift in year one would upset you, capped is worth considering. For most gardens, the change on an uncapped board is something you notice for a month and then forget. The types guide explains the difference properly.

How to buy so the settled colour is right

1. Order free samples and leave them outside for two weeks, in the sun, wet them now and then. They will start to settle and give you a better idea than a fresh sample ever will.
2. If torn between two shades, choose the darker. It lands where the lighter one started.
3. Order all the boards in one go. Boards from different batches can settle to slightly different tones. A deck laid from one delivery settles as one.
4. Buy trims and fascia at the same time, for the same reason.
5. Read the colour guide for what each of the eight finishes settles to and which show dirt.

Can you restore or prevent it?

You cannot prevent it; UV blockers and sealers sit on the surface and peel. You do not need to restore it, because the settled colour is the true colour. If a board looks tired after several years it is usually dirt and algae, not fade, and the spring wash in how to clean composite decking brings it back. Composite brighteners exist and are harmless; they lift dirt and give a temporary richness, but they are cosmetic.

What our customers say a year on

The same thing, more or less: "It went a bit lighter in the first summer and I have not thought about it since." That is the honest description of composite decking colour, and it is a better outcome than any timber deck that has not been oiled in two years.