How is composite decking actually made, and why does that matter for a wet climate?

Most composite decking is a blend of wood fiber and plastic, sometimes wrapped in a protective polymer cap. The plastic content is what resists moisture absorption, so higher-quality composites with a full cap perform noticeably better than low-grade or uncapped versions in a consistently wet, humid environment.

What should I ask a contractor before hiring them for a composite deck in this area?

Ask how they handle ledger flashing at the house connection, what fastener and hardware grade they use given the salt air, and whether they'll adjust joist spacing for the specific composite product you choose. A contractor who can answer specifics rather than giving a generic wood-deck answer is a good sign.

Are all composite decking brands built to the same standard?

No. Brands vary significantly in cap quality, core density, and warranty terms, and some product lines within the same brand are capped while others aren't. We'll go over the specific product lines we install and why, rather than treating "composite" as one interchangeable material.

Does composite decking fade or change color over time?

Yes, to some degree — most composite boards lighten slightly in their first year as they weather in, then hold color fairly steadily after that. Capped boards generally fade slower and more evenly than uncapped ones, which is worth factoring in for south- or west-facing decks that get more direct sun.

Is Custer's proximity to the water really a big enough factor to change how a deck should be built?

Yes. Salt-laden air and consistently damp conditions accelerate corrosion on fasteners and hardware and feed moss growth faster than they would further inland, so hardware grade, flashing detail, and board selection are all worth getting right the first time rather than treating it like a standard inland build.

Composite Decking in Custer & Ferndale, WA

Why Custer's Weather Is Hard on Decks

Custer sits close enough to Birch Bay and the Strait of Georgia that salt-laden air is a regular part of the weather, not an occasional visitor. Combine that with Whatcom County's long wet season, driving rain that comes in sideways off the water, and the shaded, damp stretches of fall through spring that grow moss on almost anything that holds still, and you've got a tough environment for outdoor structures. A deck in Custer works harder than the same deck fifty miles inland. Fasteners corrode faster near salt air, wood fibers stay damp longer under moss and needle debris, and freeze-thaw cycles in the coldest stretches can pry apart anything that wasn't built tight the first time.

None of this means a deck can't last here — it means the material and the build have to account for what the site actually does to a structure, not what a catalog photo assumes.

What Composite Decking Solves For Custer Homes

Composite decking earns its place in this climate because it doesn't feed the two biggest problems wood has here: it won't rot from sustained moisture, and it doesn't give moss and algae the organic surface they need to really take hold the way raw wood does. That's not the same as saying composite is maintenance-free — more on that below — but it removes the failure mode that ends most wood decks in this area early: soft, punky boards from years of standing water and shade.

For a Custer property, that generally means:

Boards that hold their shape and color through wet winters without cupping or splitting
A surface that's easier to keep clear of moss film than bare wood
No annual sanding, staining, or sealing schedule to keep up with
Better long-term footing underfoot when the deck is wet — which, in this area, is most of the year

Not All Composite Boards Handle This Climate the Same

"Composite decking" covers a wide range of products, and the differences matter more here than in a dry climate. The two broad categories are capped and uncapped composite.

Capped Composite

Capped boards have a shell — usually a PVC or polymer cap — wrapped around a wood-plastic composite core. That shell is what actually resists moisture intrusion, staining, and the surface breakdown that lets algae and moss get a grip. In a salt-air, high-rain environment like Custer, we consider a fully capped board (cap on all four sides, not just the top and face) the right standard for anything exposed to direct weather.

Uncapped Composite

Older-style uncapped composite is more exposed wood fiber at the surface. It's typically less expensive up front, but it absorbs more moisture over time and is more prone to fading, staining, and surface fuzzing in a wet climate. We'll install it if that's what a homeowner specifically wants, but we explain the trade-off honestly before quoting it for a Custer deck.

Factor	Capped Composite	Uncapped Composite
Moisture resistance	High — sealed shell on all sides	Moderate — exposed fiber absorbs more moisture
Moss/algae resistance	Better — smoother, less porous surface	Fair — more texture for growth to cling to
Fading over time	Slower, more consistent	Faster, especially on sun-exposed runs
Upfront cost	Higher	Lower
Typical warranty	25–50 years, often prorated	Shorter, sometimes limited

The Substructure Matters as Much as the Boards

A lot of composite deck problems people blame on the boards actually start underneath them. Composite decking is heavier than wood and behaves differently with temperature swings, so the framing and fastening system have to be matched to it, not just reused from a wood-deck playbook.

For Custer sites, we pay particular attention to:

Joist spacing — many composite products require tighter joist spacing than standard lumber decking, especially on diagonal or angled patterns
Ledger and flashing details — where the deck meets the house is the single most common point of hidden water damage in this region's rain
Hidden fastener systems — clip-based fastening avoids face screws that can telegraph rust stains in salt air over time
Ventilation underneath — trapped moisture under a low deck accelerates joist and beam problems even when the decking above looks fine
Corrosion-resistant hardware — coastal-rated fasteners and connectors, not standard interior-grade hardware

Moss, Mildew, and Salt Film: What Ongoing Care Actually Looks Like

Composite decking cuts down maintenance significantly, but "low maintenance" isn't "no maintenance" in a climate like Custer's. Moss spores and airborne salt don't care what the decking is made of — they'll settle on the surface either way. The difference with composite is that a simple rinse and occasional soft-wash keeps it clean, instead of the sanding, brightening, and re-sealing wood needs to fight the same buildup.

A realistic seasonal routine looks like:

Sweep debris (needles, leaves, seed pods) off regularly so it doesn't trap moisture in one spot
Rinse with a garden hose every few weeks during the wet months to clear salt film and early moss spores
Use a soft-bristle brush and a mild soap or manufacturer-approved deck cleaner on shaded areas where moss tends to settle
Avoid pressure washing directly into board grooves — it can drive water and grit into fastener channels
Check railing posts and stair stringers once a year for any movement, since these connection points take the brunt of wind-driven rain

Our Installation Process

We approach every Custer composite deck the same structured way, whether it's a full replacement or new construction:

Site assessment — we look at sun exposure, drainage slope, proximity to trees or shaded fence lines where moss pressure will be highest, and how exposed the deck will be to wind-driven rain
Substructure evaluation — on replacement jobs, we check existing framing, ledger attachment, and footings before assuming they can carry a new composite surface
Material selection — we walk through capped vs. uncapped options, color and grain choices, and hidden-fastener vs. face-screw systems based on the specific site
Framing and flashing — correct joist spacing for the chosen product, proper ledger flashing, and coastal-rated hardware throughout
Decking installation — boards laid with manufacturer-specified gapping to allow for expansion, since composite moves more with temperature than most homeowners expect
Finish details — fascia, stair treads, and railing integration finished to match, with attention to any point where water could pool or collect debris

What a Custer Composite Deck Typically Costs

Pricing depends heavily on deck size, height off grade, railing style, and board tier, but the factors below tend to move the number the most.

Cost Factor	Why It Matters
Board tier (capped vs. uncapped)	Capped boards run higher per square foot but hold up better against salt air and moss
Deck height and railing requirements	Taller decks need code-compliant railings and often more substantial framing
Substructure condition	Replacing rotted framing or undersized footings adds cost but is not optional for a safe deck
Fastening system	Hidden clip systems cost more in labor but avoid visible fastener corrosion over time
Access and site layout	Sloped lots or limited equipment access can add labor time

Signs an Existing Deck Should Be Replaced, Not Patched

We get calls in Custer for both new decks and replacements of older wood decks that have finally lost the fight with the climate. A few signs it's time to stop patching:

Soft or spongy spots underfoot, especially near the house or in shaded corners
Persistent moss regrowth within weeks of cleaning, even after brushing and washing
Visible gaps opening between boards, or boards that have cupped or crowned
Rust streaking from old fasteners bleeding into the wood grain
Railing posts that flex or wobble when pushed
A ledger board that shows staining or softness where it meets the house siding

Why a Crew That Already Works Custer Makes a Difference

A deck built to a generic spec sheet and a deck built for this specific stretch of Whatcom County are not the same project, even if the materials look identical on paper. Knowing how far salt air travels inland from the water, how long moss pressure lasts into the year here compared to drier parts of the state, and which fastener and flashing details actually hold up through a Custer winter comes from working this ground repeatedly — not from a manufacturer's install guide alone. That local pattern recognition is what keeps a deck performing in year eight the way it did in year one, instead of needing early fixes that a slightly different build would have avoided.

If you're weighing a new composite deck or replacing a tired wood one in Custer, we're glad to walk the site, talk through board options honestly, and put together a straightforward estimate — no pressure, no obligation. The form below is the fastest way to get that started.