What's the real difference between composite decking and PVC decking?

Composite blends wood fiber with polymer, usually with a protective cap; PVC is fully synthetic with no wood content at all. PVC typically costs more but resists moisture even better, which is worth considering on fully exposed, waterfront-facing decks. Both outperform bare wood in our wet climate, but they're not interchangeable in price or feel underfoot.

How do I vet a contractor for a composite decking project instead of just picking the cheapest bid?

Ask specifically about their framing practices — joist tape, ledger flashing, and fastener grade — since that's where most long-term problems start, not in the visible boards. Confirm they'll pull the required permit and ask how they handle manufacturer warranty registration. A contractor who walks you through trade-offs instead of just pushing one product is usually the safer bet.

Do you install a specific composite decking brand, or can I pick from several?

We work with several established capped composite and PVC manufacturers rather than pushing one brand, and we'll help you match a product to your budget and how exposed the deck is to sun, rain, and salt air. What we won't recommend is uncapped composite or bare wood on a fully exposed coastal deck, since the maintenance burden there is real.

Why does composite decking need gaps between boards instead of a tight, seamless fit?

Composite expands and contracts with temperature more than wood does, and the gaps allow room for that movement without buckling or bowing. Those same gaps let rainwater drain through the deck surface instead of pooling, which matters a lot given how much rain this area gets. Manufacturers specify exact gap widths, and getting that spacing right is part of a correct installation, not a cosmetic choice.

Does the salt air around Anacortes actually affect a deck's hardware and fasteners?

Yes — standard galvanized fasteners and hardware corrode noticeably faster this close to the water than they would further inland in Skagit County. We use stainless steel or marine-rated coated fasteners and hidden fastening systems on Anacortes decks specifically to avoid streaking and premature corrosion. It's a small cost difference upfront that avoids a much bigger repair down the line.

Expert Composite Decking for Anacortes Homes

Why Anacortes Decks Take a Different Kind of Beating

Anacortes sits out on Fidalgo Island, surrounded by Rosario Strait, Skagit Bay, and the channels around the San Juans. That location is beautiful, but it's hard on exterior wood. Salt-laden marine air corrodes fasteners and hardware faster than it does further inland. Driving rain off the water finds every gap in a deck's framing. And because so many Anacortes lots sit under fir and cedar cover, decks here go through a long moss and mildew season that can run from fall through spring.

A deck built without that climate in mind starts showing problems within a few seasons — graying and splintering boards, soft spots where water has pooled, rusted screws bleeding orange streaks across the surface, and moss creeping into shaded corners. None of that is a materials failure so much as a mismatch between the product and the site. Composite decking, installed correctly for this specific climate, closes most of those gaps.

What Composite Decking Actually Solves

Composite boards are made from a blend of wood fiber and polymer, and the better products add a polymer cap around that core. That construction does a few things that matter directly for a coastal Skagit County property:

The surface doesn't absorb water the way solid wood does, so it isn't feeding the mildew and moss that thrive in our wet, shaded microclimates.
There's no annual sanding, staining, or sealing — a real advantage when a deck sits under tree cover and gets soaked half the year.
No splintering, which matters on a deck that gets bare feet and pets year-round.
Consistent color and grain, so the deck doesn't gray unevenly the way cedar or fir does when parts stay shaded and parts get direct sun.

None of that makes composite maintenance-free — we'll get to what it still needs — but it removes the wood-specific failure points that cause most of the deck replacement calls we get from this part of Skagit County.

Choosing the Right Composite for a Coastal Property

Capped vs. Uncapped

Not all composite is built the same. Uncapped composite (an earlier generation of the product) has the wood-plastic core exposed on all sides, which means it can still absorb some moisture at cut edges and gaps — a real consideration this close to the water. Capped composite wraps that core in a polymer shell, giving it much better moisture and stain resistance. For an Anacortes property, we generally steer homeowners toward capped composite or PVC decking specifically because of the salt air and rain exposure — the extra material cost pays for itself in fewer callbacks and a longer service life.

How It Compares to the Alternatives

Material	Moisture Resistance	Upkeep	Typical Lifespan Here
Untreated cedar/fir	Fair — absorbs water, needs sealing	Annual cleaning, sealing/staining	10–15 years with upkeep
Uncapped composite	Good, but exposed core can wick moisture at cuts	Periodic washing; no staining	15–20 years
Capped composite / PVC	Very good — sealed core resists moisture and salt exposure	Occasional washing	25+ years

We're not going to tell you a particular board or brand is the only right answer — there are several good manufacturers making capped composite today, and we'll walk you through the options that fit your budget and how the deck will be used. What we won't do is install uncapped composite or bare wood on a fully exposed, waterfront-facing deck and call it a long-term fix — that's a maintenance burden we'd rather be honest about upfront.

Framing: The Part Nobody Sees But Everyone Pays For

Composite boards get most of the attention, but the framing underneath is what actually determines whether the deck holds up in this climate. A few things we treat as non-negotiable on Anacortes jobs:

Joist Protection

Composite decking doesn't rot, but the wood joists underneath it still can — and a solid composite surface can actually trap moisture against untreated joists if they aren't protected. We run joist tape (a self-adhering waterproof flashing) across the top of every joist before boards go down. It's a small material cost that prevents the single most common cause of "my composite deck is failing" calls: a rotted frame under a perfectly good surface.

Ledger Flashing

Where a deck attaches to the house, the ledger board takes the brunt of driving rain coming off the strait. Proper flashing there — not just caulk — is what keeps water from working its way into the rim joist and the wall behind it over time.

Fasteners and Hardware

Standard galvanized fasteners corrode faster in salt air than most homeowners expect. We use stainless steel or marine-rated coated fasteners and hardware on Anacortes decks, along with hidden fastener systems on the visible composite boards so there's nothing exposed to streak or rust in the first place.

Our Installation Process

A composite deck done right isn't a fundamentally different process than a wood deck — it's the same job with tighter tolerances, because composite behaves differently than lumber in a few important ways.

Site and structure evaluation. We check the existing framing (on a rebuild) or the ledger, footings, and grading (on new construction) before anything else — no point putting new boards on a frame that won't outlast them.
Framing and joist protection. Repair or rebuild the substructure, set joist spacing to the manufacturer's spec for composite (often tighter than a standard wood deck), and install joist tape and ledger flashing.
Board layout and expansion gaps. Composite expands and contracts with temperature more than wood does. We space and fasten boards to the manufacturer's gap specs so the deck doesn't buckle in a hot August afternoon or gap unevenly in January.
Hidden fastening and picture-framing. Clip-based hidden fastener systems keep the surface clean, and a picture-framed border (perimeter boards run perpendicular to the field) gives a finished edge and covers exposed end grain.
Railing and stairs. Matched or complementary railing system, sized and coded to current requirements for the structure's height and use.
Final walkthrough. We check fastening, drainage, and gap consistency before we call it done, and we go over basic care with you.

Moss, Mildew, and Salt Air: What "Low Maintenance" Still Requires

Composite is genuinely lower-maintenance than wood, but on a Skagit County property with a long wet season, "low maintenance" isn't "no maintenance." A few realities worth knowing going in:

Pollen, needles, and organic debris still collect in board gaps, and if left long enough in our damp shoulder seasons, that debris can grow moss just like any other surface. Periodic sweeping and an occasional hose-down or soft wash keeps it from taking hold.
Correct gap spacing (part of a proper install) is what lets water drain through instead of sitting on the surface — this is a bigger factor in moss prevention than the board material itself.
Decks under heavy tree cover or on a north-facing exposure — common on wooded Anacortes and Fidalgo Island lots — stay damp longer and need more frequent cleaning than a sun-exposed deck.
Metal railing, hardware, and fastener heads near salt air will dull or show light corrosion over years even when rated for exterior use; a rinse after storms and periodic inspection extends their life.

Cost Factors for an Anacortes Composite Deck

Every deck is priced around the specifics of the site, but the variables that move the number the most are consistent:

Factor	Why It Matters
Deck size and shape	Square footage plus corners, curves, or multiple levels affect labor and board waste
Existing framing condition	A rebuild of a rotted substructure adds cost before the first composite board goes down
Board tier	Entry-level capped composite vs. premium capped composite/PVC lines
Railing type	Composite, aluminum, cable, or glass railing systems vary widely in cost
Stairs and height	Additional stairs, landings, or guard height requirements add material and labor
Site access	Waterfront, bluff, or tight-lot access can affect equipment and staging

We'd rather walk your specific site and give you real numbers than throw out a broad range that doesn't mean much either way — but as a general sense, composite decking runs meaningfully more per square foot than pressure-treated wood upfront, with that gap closing over the deck's life once you factor out staining, sealing, and board replacement.

Permits and Site Considerations Around Anacortes

Most deck construction and replacement in and around Anacortes requires a permit, particularly for attached or elevated structures — this is standard practice across Skagit County jurisdictions, not something unique to decking. Properties near the shoreline or on bluff lots, which are common on Fidalgo Island, can also fall under additional review for setbacks or critical areas. We handle the permit process as part of the job and will flag early if your property's location is likely to need extra review, rather than surprising you partway through the project.

Why a Crew That Already Works Anacortes Matters

Decking is a trade where local experience shows up in details a homeowner wouldn't necessarily think to ask about: which fastener grade actually holds up a few blocks from the water versus a mile inland, how much tighter to run joist spacing on a shaded, moisture-heavy lot, and which local jurisdiction handles the permit for a given address. A crew that's already worked Anacortes and the rest of Skagit County isn't learning those things on your project.

What to Ask Before You Hire

Do they use joist tape and proper ledger flashing, or just fasten boards straight to bare framing?
Are fasteners and hardware rated for coastal/salt-air exposure, or standard galvanized?
Do they follow the manufacturer's spec for gap and expansion joints, or eyeball it?
Will they pull the required permit, and do they know if your lot needs shoreline or critical area review?
Can they explain the real trade-offs between board tiers instead of just upselling the most expensive option?

If a contractor can't answer those clearly, that's worth knowing before the framing goes in, not after the deck starts failing.

If you're weighing a new composite deck or replacing one that hasn't held up to the salt air and rain, we're happy to take a look and give you an honest read on what your property needs. Use the form below to request a free, no-pressure estimate.