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Materials · Composite decking

Composite decks

Capped composite boards combine wood fibre and plastic under a protective shell. They don't need staining, don't splinter and carry long manufacturer warranties, which is why they've become the default upgrade on new decks around the Lower Mainland. They cost more upfront and save on upkeep over time.

Installed
$60–100 per sq ft installed
Lifespan here
About 25–30+ years
Upkeep
Wash once or twice a year
Upkeep cost
About $0–200 a year

Common brands: Trex, TimberTech, Fiberon and others

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Pros

What it does well

  • No staining or sealing
  • Long warranties, often 25–50 years
  • Doesn't splinter
  • Colour stays consistent

Cons

What to weigh up

  • Higher upfront cost
  • Can get hot in full sun
  • Dirt and mildew can still build up in shade
  • The frame underneath is still wood
Best for: Families who want a long-lasting deck without staining

In our climate

The boards will outlast the frame, unless you protect it

Capped composite shrugs off rain, but the pressure-treated joists under it don't. Water that sits on the tops of joists under the boards is what usually ends a composite deck's life early.

Ask your builder about joist tape, joist spacing for the product you choose (many need 12 in on centre on stairs and angled layouts), and enough ventilation under low decks. A wash in spring and fall keeps shaded decks from going green.

Rough budget

A 300 sq ft low composite deck

Installed
$18,000 – $30,000
10 years of upkeep
$0 – $2,000
10-year total
$18,000 – $32,000

Before railings, stairs, permits and GST. Raised decks cost more.

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Questions

Composite decking questions

Does composite decking get mouldy?

The boards themselves resist rot, but dirt and pollen can grow mould and mildew on the surface in shady, damp spots. A wash in spring and fall usually takes care of it.

Can composite go on my old deck frame?

Sometimes, if the frame is sound and the joist spacing suits the product. Many composite boards need joists at 16 in on centre or closer, and 12 in on stairs and angled layouts.

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Other decking materials

Pressure-treated wood$35–65 per sq ft installed · About 15–20 yearsWestern red cedar$50–85 per sq ft installed · About 12–20 yearsPVC decking$75–120 per sq ft installed · About 30–50 yearsVinyl membrane$45–85 per sq ft new, $15–35 to re-cover · About 15–20 years

Guides

How to Choose a Langley Deck BuilderHiring a Langley deck builder? What to check, City vs Township permits, insurance and WorkSafeBC, questions to ask, local costs and red flags.Cedar vs Composite Decking in BC: Cost, Upkeep and LifespanCedar vs composite decking for wet BC weather: compare upfront price, 10- and 20-year costs, moss, lifespan and upkeep before you choose your boards.Vinyl Decking in BC: Cost, Lifespan, Care and Re-CoversVinyl deck guide for BC: what vinyl decking costs new and to re-cover, how long it lasts, signs of failure, and when it beats composite over living space.

Related services

New decksGround-level, raised and multi-level decks in wood, composite or PVC, built from the footings up.Deck replacementTear out a tired or rotting deck and rebuild it, often on a new frame with low-maintenance boards.Deck repair & resurfacingBoard replacement, rot repairs, new boards on a sound frame, cleaning, staining and refinishing.

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