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Measuring up for composite decking
Garden

Decking, counted properly

Two boards, one length, five colours — and a count that includes the edge board and the spare, which are the two things every decking order forgets.

  • 2.9mone board length
  • 140 × 25mmboard profile
  • ~0.41m²coverage per board
  • 5stock colours
Why these boards

One length, no false promises

Every board is 2.9m. Anything longer than that takes a joint and a doubled joist under it — so the direction the boards run is the only lever you have, and it is worth deciding before you count.

Capped or reversible

Select Capped wraps the core in a bonded polymer shell that holds colour and resists stains. Signature Woodgrain is reversible — woodgrain one face, grooves the other.

Nothing to seal

No oiling, no staining, no spring ritual. Composite keeps its surface with an occasional wash and nothing else.

Light enough to handle

Hollow cores with circular voids keep each board at 8.1kg — manageable to lift, cut and fix without a second pair of hands.

The edge board closes it

A cut hollow board shows its voids. The square-edged capped edge board hides every exposed end and the frame fascia behind it.

Order builder

How many boards do I need?

Put the deck in as rectangles and we’ll count the boards, the edge boards and the spare — the same sum as our decking guide, done for you.

1 · Which board?

2 · Colour

The edge boards come in the same five colours and follow whatever you pick here. Order a free sample if you want to see it in your garden light first.

3 · The deck

Not a rectangle? Split it into rectangles and add them up. Don’t deduct small openings — a post penetration or a tree cut-out doesn’t save you a board, because the board still has to be cut around it.

4 · The exposed edge

metres

Measure the sides of the deck people will actually see — a side against the house or a wall doesn’t need edging. This is the single most forgotten item on a decking order; counting it now beats a second delivery next week.

Specification

The numbers

Deck boards2900 × 140 × 25mm — Select Capped and Signature Woodgrain
Edge board2900 × 142 × 23mm, square edge, capped
Coverage~0.41m² per board including the gap
Weight8.1kg per board
ConstructionHollow core with circular voids
MaintenanceNo oiling, staining or sealing
ColoursBlack, Grey, Ash, Oak, Brown
DeliveryTail-lift, driver offload to hard standing, kerbside
Before you order

Three things worth knowing

Boards run across the joists

And on a deck that drains one way, along the fall rather than against it. Decide the direction before you count anything — it changes the answer.

The edge board is the forgotten item

It usually gets remembered a week after the deck arrives, by which point the deck is built. Order it with the boards, in the same colour, from the same batch.

Keep the spare out of the sun

Boards settle slightly in their first months of UV. A spare kept in the garage still matches the deck if it is ever needed; one bought next summer will not.

Joists, frame and fixings are specified with your quote rather than guessed at here — tell us what the deck is carrying and which way the boards run.

Send us the sketch and we will count it

A plan with two measurements on it is enough. Free, no obligation, and usually back the same day.

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