Siding, Windows & Exterior

Composite vs. Cedar Decking in the Pacific Northwest

The Peaks & Valleys field teamWritten by the crews and inspectors on the roofs

Guide2 min readLast reviewed July 7, 2026How we research

The short answer

For most PNW decks, capped composite (Trex, TimberTech) wins: no staining, no splinters, no moss farming in the grain, at $60–$110/sq ft installed. Cedar costs 20–30% less upfront but demands staining every other year and ages hard under our rain and canopy. Composite's higher entry price usually pays back in saved maintenance by year eight.

Part of our guide to Planning a Full Exterior Renovation: The PNW Homeowner's Guide.

A deck in the Pacific Northwest gets maybe ten good weekends a year and forty inches of rain the rest of the time. That reality — not the showroom sample — should drive the composite-versus-cedar decision. Here’s the honest comparison from crews who build both.

The PNW factor: rain, moss, and shade

Our climate is brutal on wood decking specifically. Constant moisture feeds rot and mold; canopy shade grows moss in the grain; and the freeze-thaw and UV cycle checks and greys the surface. A material’s PNW performance is mostly about how it handles being wet for months. That’s the lens.

Capped composite: the PNW default

Capped composite (Trex, TimberTech, and similar) is a wood-plastic core wrapped in a protective polymer shell:

No staining or sealing, ever. The single biggest advantage here — you reclaim the every-other-summer maintenance weekend that cedar demands.
No moss farming. The capped surface doesn’t hold moss in grain the way wood does; a rinse handles it.
No splinters, no rot, no checking. It stays what it was on day one.
Cost: $60–$110 per square foot built right — most projects $18,000–$45,000 with railings and stairs.

The tradeoff is upfront cost and a slightly less “natural” feel than real wood (though modern composites have closed that gap dramatically).

Cedar: real wood, real maintenance

Cedar is beautiful and naturally rot-resistant, and it costs 20–30% less upfront than composite. But in our climate:

It needs staining/sealing every other year to fight moisture and UV — miss it and the wood greys, checks, and starts to degrade.
It grows moss in shaded, grained areas and needs regular cleaning.
It ages faster here than in drier climates, even maintained.

Cedar makes sense if the budget is tight, you genuinely enjoy the maintenance ritual, or the natural-wood look is non-negotiable for the home. Eyes open about year eight.

The lifetime math

Cedar’s lower entry price is real, but add up eight years of stain, sealer, cleaning, and your weekends, and composite’s premium usually pays back — while looking better the whole time. For a deck you’ll keep long-term, composite is typically the smarter dollar. For a short-term or budget build, cedar is defensible.

What matters under both

Neither material saves a deck built on a bad frame. The parts that actually fail — and cause the collapses you read about — are the footings below frost line and the flashed, bolted ledger where the deck attaches to the house. We build the structure right first, hidden fasteners standard, then let you choose the surface. Here’s our deck approach.

Planning a deck? Book a free estimate — we’ll price both materials honestly against your yard and budget. See custom decks.

Questions homeowners actually ask

Is composite or cedar better for a Pacific Northwest deck?

For most PNW decks, capped composite is the default choice because it doesn't stain, splinter, rot, or farm moss in the grain. Cedar costs less upfront but ages hard under our rain and canopy shade. For a deck you'll keep long-term, composite is typically the smarter dollar; for a short-term or budget build, cedar is defensible.

How much does a composite deck cost?

Capped composite runs $60 to $110 per square foot built right, with most projects landing between $18,000 and $45,000 once you include railings and stairs. Cedar costs 20 to 30 percent less upfront. The gap narrows over time once you add up cedar's maintenance.

How much maintenance does a cedar deck need here?

Cedar needs staining or sealing every other year to fight moisture and UV, and if you miss it the wood greys, checks, and starts to degrade. It also grows moss in shaded, grained areas and needs regular cleaning. It ages faster in our climate than in drier ones, even when maintained.

Does composite's higher price actually pay off?

Cedar's lower entry price is real, but add up eight years of stain, sealer, cleaning, and your weekends, and composite's premium usually pays back while looking better the whole time. You also reclaim the every-other-summer maintenance weekend that cedar demands. Composite is typically the smarter dollar for a deck you'll keep.

What actually makes a deck fail?

Neither material saves a deck built on a bad frame. The parts that actually fail, and cause the collapses you read about, are the footings below frost line and the flashed, bolted ledger where the deck attaches to the house. We build the structure right first, with hidden fasteners standard, then let you choose the surface.