What's the real difference between hidden-fastener composite decking and face-screwed boards?

Hidden fastener systems clip boards from the side, leaving no screw heads on the walking surface, which gives a cleaner look and one less place for water to sit around a screw head. Face-screwed boards are simpler and sometimes more repairable, but in a wet, salt-air environment the exposed fastener heads are more exposed to corrosion over time. Either can work well if installed correctly with the right fasteners.

What should I ask a contractor before hiring them to build a deck near the water in Anacortes?

Ask whether they pull permits and handle the engineering for guardrails and ledger attachment, what fastener and hardware grade they use given salt air exposure, and whether they can show you a similar completed project in the area. Also ask directly how they detail the ledger flashing where the deck meets your house, since that's the most common source of hidden water damage. A contractor who can answer these specifically, rather than generally, is a good sign.

Is modern capped composite decking actually different from the composite boards sold years ago?

Yes — early composite decking was largely uncapped, meaning the wood-plastic material was exposed directly to weather and could stain, fade, or absorb moisture at the surface over time. Capped composite adds a protective outer shell around that core, which significantly improves resistance to moisture, staining, and mildew. It's a meaningfully different product from first-generation composite, not just a marketing update.

Do composite deck boards get hot or slippery when they're near the water and humid?

Composite decking can get warmer underfoot than wood in direct summer sun, with darker colors absorbing more heat, so color choice matters if the deck gets a lot of afternoon sun. Surface texture matters more for slip resistance in a damp, humid climate like this — most quality composite boards have a textured, embossed surface designed to stay grippy when wet, but it still needs periodic cleaning to keep moss and algae film from building up. A shaded, damp deck should be cleaned more often than one that gets regular sun.

Does a deck at Ship Harbor need different engineering for wind compared to other parts of Anacortes?

Lots closer to the water can see stronger, more consistent wind exposure than more sheltered inland areas of the city, which can factor into how railing posts and guardrails are anchored and braced. Skagit County and Anacortes permitting will apply the same baseline code either way, but a contractor familiar with waterfront lots will typically build connections a bit more robust than the code minimum in exposed spots. It's worth having your specific lot assessed rather than assuming every Anacortes deck is treated identically.

Ship Harbor Composite Decking: Built for Anacortes Weather

Decking for a Waterfront Corner of Fidalgo Island

Ship Harbor sits close to the water, and that proximity shapes everything about how a deck ages here. Homes in this part of Anacortes get more wind off the water, more wind-driven rain, and more shade-and-moisture combinations that grow moss than a deck built ten miles inland in Skagit County. A deck that would hold up fine in a dry, sunny yard can start showing problems within a few seasons here if it wasn't built with this specific exposure in mind.

This page is about one job in one place: composite decking for Ship Harbor homes. Not a general decking overview, not a sales pitch for a particular board brand — just what actually matters when you're building or replacing a deck this close to the water.

What Salt Air, Rain, and Moss Actually Do to a Deck Here

Three things drive almost every deck problem we see in this area, and they compound each other.

Salt Air and Metal

Airborne salt accelerates corrosion on anything metal — fasteners, joist hangers, railing brackets, structural screws. A deck built with standard carbon-steel hardware can start showing rust streaks and weakened connections well before the decking itself shows any wear. This is one of the most common failure points we find on older decks near the water, and it's almost always invisible until you pull a board.

Driving Rain

Wind off the water pushes rain sideways, not just down. That matters at every horizontal surface and every seam: ledger boards where the deck meets the house, board end-cuts, and any spot where water can get pushed up and under instead of running off. A deck built assuming rain only falls straight down will trap water in places a fair-weather design never accounts for.

Shade, Moisture, and Moss

Combine damp air with any amount of tree cover or north-facing shade and you get a long moss season — often most of the year in the Pacific Northwest. Moss holds moisture against the deck surface, and on traditional wood that means rot underneath a layer that looks merely dirty from a distance. On the wrong composite product, sustained moss and mildew can also dull the surface finish over time.

Why Composite Makes Sense for This Location

Composite isn't automatically the right answer everywhere, but for a Ship Harbor exposure it solves the specific problems above better than raw wood does. It won't rot from trapped moisture the way lumber can, it doesn't need periodic sealing or staining, and modern capped composite resists moss and mildew staining far better than wood or older uncapped composite products. The trade-off is upfront cost and the fact that composite is only as good as the framing, fasteners, and drainage underneath it — the board itself is not the whole job.

Material	Moisture Behavior	Moss/Mildew Resistance	Maintenance	Typical Lifespan
Pressure-treated wood	Absorbs water, can trap it under moss	Low — needs regular cleaning and re-sealing	Annual sealing/staining	10–15 years in this climate
Uncapped composite (older style)	Some moisture absorption at surface	Moderate — can stain and mildew over time	Periodic cleaning	15–20 years
Capped composite	Sheds water, doesn't absorb	Good — cap layer resists staining	Occasional rinse/wash	20–30 years
PVC decking	Fully waterproof board	Very good	Low	25+ years

For a Ship Harbor property, we generally steer clients toward capped composite or PVC unless there's a specific reason to go another direction — the added upfront cost tends to pay for itself in avoided maintenance and fewer callbacks over the life of the deck.

What a Correct Composite Deck Install Actually Involves

The composite board itself gets most of the attention, but the framing and details underneath it decide whether the deck holds up in this environment. A deck can use premium boards and still fail early if the substructure was built like it's somewhere dry and inland.

Fasteners and Hardware

Given the salt air, we treat corrosion-resistant fasteners and connectors as a baseline, not an upgrade — stainless steel or heavy-duty coated hardware at every structural connection, not just the visible screws.

Ledger Flashing

Where the deck attaches to the house is the single most common spot for hidden water damage on any deck, and it's more critical here because of wind-driven rain. Proper flashing at the ledger board, installed so water sheds away from the house rather than behind the siding, is not optional.

Joist Protection and Ventilation

Joist tape over the framing keeps moisture from sitting on top of the lumber under the decking, and proper spacing keeps air moving underneath so the whole system can dry out between rain events instead of staying damp.

Board Spacing and Drainage

Correct gapping between boards, and a deck surface with slight slope away from the house, keeps water moving off the deck instead of pooling — pooled water is exactly what feeds moss growth in a shaded, damp spot.

Corrosion-resistant fasteners and joist hardware throughout, not just where visible
Flashed, sealed ledger connection at the house
Joist tape on all framing members under the decking
Proper board gapping for drainage and thermal expansion
Slight slope built into the deck surface for water runoff
Footings sized and set for this soil and frost depth, per code
Railing posts anchored to blocking, not just fastened to the rim board

Railings, Permits, and Code in Anacortes

Most deck projects in the city of Anacortes and unincorporated Skagit County need a permit, particularly once the deck is elevated or attached to the house structurally. Guardrails on raised decks have specific height and baluster-spacing requirements, and ledger attachment to the house has its own code requirements around fastening and flashing. We handle the permit process as part of the job rather than leaving it to the homeowner, and we build to code as the floor, not the ceiling — especially on guardrails, since that's the safety-critical part of any elevated deck.

Our Process, Start to Finish

The work generally moves through the same stages on every Ship Harbor project:

On-site assessment — we look at the existing deck or building site, note sun/shade exposure, drainage direction, and any wind exposure specific to the lot.
Design and material selection — board style and color, railing type, and layout, matched to the home and the site conditions.
Permit and engineering — we pull the required permit and handle any engineering the guardrails or ledger attachment call for.
Tear-out (if replacing an existing deck) — removing old decking and inspecting the framing underneath before deciding what can be reused.
Framing and flashing — footings, joists, ledger flashing, and joist tape, done before a single composite board goes down.
Decking and railing installation — boards, hidden fastener systems where applicable, and railings.
Final walkthrough — checking the deck with you before we consider the job done, including a review of any maintenance the specific product you chose needs.

Maintenance in a Salt-Air, Moss-Prone Environment

Composite is lower-maintenance than wood, not maintenance-free. In a Ship Harbor location, we recommend a periodic rinse to clear salt residue and organic debris before it has a chance to feed moss, especially on shaded sections of the deck. A soft-bristle brush and mild soap handle most buildup; pressure washing should be done carefully and at the settings the manufacturer allows, since too much pressure can damage the cap layer on composite boards. Gutters and downspouts near the deck should be kept clear too — a lot of moss and moisture problems on decks actually start with water draining onto the deck from somewhere else on the house.

Why a Local Ship Harbor Crew Matters

A contractor who already works this stretch of Anacortes has already dealt with the wind exposure, the permit process at the city and county level, and the fastener and flashing decisions that matter here — they're not learning those lessons on your project. That familiarity shows up in small but real ways: knowing which corner of a lot tends to catch the worst wind-driven rain, sizing footings appropriately for the soil, and specifying hardware that's actually rated for a marine-influenced environment rather than generic hardware store screws. It also means a faster, more informed response if something needs attention down the road, since we're not unfamiliar with the site or the area's conditions.

If you're planning a new deck or replacing an aging one near Ship Harbor, we're glad to take a look and put together a straightforward, no-pressure estimate. Use the form below to get started.