How is composite decking actually different from wood decking over the long run, not just when it's new?

Wood decking depends on you keeping up with sealing and cleaning every year to resist moisture and organic growth, while composite is engineered to resist water absorption and rot from the start. The tradeoff is usually upfront cost — composite boards cost more per square foot, but they typically outlast wood decking by 10 to 15 years with far less annual upkeep.

What should I ask a contractor before hiring them to install composite decking in Skagit County?

Ask whether they've pulled permits for deck projects in your specific jurisdiction, how they handle ledger flashing at the house connection, and what fastening system they use for composite boards. Also ask what they do differently for a low, damp, or shaded lot versus a dry, sunny one — a contractor who gives you the same answer for both hasn't thought about it.

Are all composite decking brands basically the same product?

No. Brands differ significantly in whether the board is capped or uncapped, how thick the protective cap is, the warranty length and what it actually covers, and how the board handles heat and fading. We'll walk you through the options that make sense for your budget and how exposed the deck will be to sun, shade, and moisture.

What's the real difference between capped and uncapped composite boards?

Capped composite has a polymer shell wrapped around the wood-plastic core that blocks moisture and resists staining and mold, while uncapped composite is blended all the way through with no protective layer. In a wet climate like ours, that cap is the difference between a board that stays clean with occasional rinsing and one that can develop surface staining over time.

Does Conway's low, damp ground change how a deck should be built compared to a deck on higher, drier ground?

Yes. Low-lying lots need extra attention to footing depth, drainage around the structure, and clearance underneath the deck for airflow, since standing moisture at ground level is more common than on elevated or well-drained sites. We also lean toward fully capped composite and corrosion-resistant fasteners more often on these lots because the framing and hardware are exposed to more sustained dampness.

Composite Decking in Conway: Built for Skagit County Weather

Composite Decking for Conway's Damp, Low-Lying Ground

Conway sits in the Skagit Valley, low and close to the water table, surrounded by farmland and river bottom that stays damp long after the rain stops. Add in the salt air drifting up from Skagit Bay and Puget Sound, driving winter rain, and a moss season that can stretch from October into May, and you have a climate that is hard on any outdoor structure. A deck built here needs to shed water fast, resist rot and mildew at ground level, and hold its finish without constant upkeep. That is exactly what composite decking is designed to do, but only when it is installed correctly for this specific environment.

We work on homes throughout the Anacortes and Skagit County area, and Conway properties present a particular set of conditions: low elevation, poor natural drainage in places, and long stretches of shade or ground moisture around outbuildings and older farmhouses. This page covers what actually matters when you put composite decking on a home in this part of the county, not generic decking advice that ignores where you live.

Why Wood Struggles Here, and Why Composite Holds Up

Traditional wood decking is not a bad product, but it is honest about what it needs: annual cleaning, periodic sealing, and dry conditions to do its job. In a climate where boards rarely get a full week to dry out between rain events, wood decking loses that battle quickly. Moss and algae take hold in the grain, boards cup and check as they swell and shrink with moisture, and fasteners work loose as the wood moves through the seasons.

Composite decking is manufactured from a blend of wood fiber and recycled plastic, which means it does not absorb water the way solid wood does. It will not rot, it resists insect damage, and modern capped composite boards have a polymer shell that keeps moisture and organic growth from getting into the board's core. That does not make it maintenance-free forever, but it removes the two biggest failure points we see on older wood decks in this area: moisture absorption and surface organic growth.

What "Capped" Actually Means

Not all composite boards are built the same, and the difference matters more here than in a drier climate.

Uncapped composite is the older style of product — wood fiber and plastic blended all the way through, with no protective shell. It can still absorb some moisture at the surface and is more prone to staining and mold in a wet climate.
Capped composite has a hard polymer layer wrapped around the wood-plastic core, usually on all four sides. This is what stops moisture penetration and gives the board its resistance to mildew, staining, and fading.
Capped on the top and sides only is a common middle-tier option — cheaper than fully capped, but the exposed bottom can still take on moisture from below, which matters on a low, damp lot.

For a Conway property, we generally steer clients toward fully capped composite. The extra cost up front is worth it when the alternative is dealing with staining or soft spots in a board that is sitting a few feet above damp ground for ten months out of the year.

What a Correct Installation Actually Involves

Composite boards are more forgiving than wood in some ways and less forgiving in others. The board itself resists moisture, but if the structure underneath it is built wrong, you end up with a deck that traps water, sags, or fails at the ledger board — the composite surface just hides the problem longer before it shows up.

The Substructure

The frame under a composite deck carries the same load whether the decking is wood or composite, so joist spacing, beam sizing, and post footings all need to meet code for the actual span and load, not just "what the last deck used." On damp Conway lots, we pay close attention to:

Footings set below frost depth and bearing on solid, undisturbed soil — not fill dirt, which is common near river bottom ground.
Pressure-treated or naturally durable framing lumber, since the frame itself is still wood even when the decking above it is composite.
Joist tape or a flashing membrane on top of every joist, so water shed by the composite boards doesn't sit directly on cut lumber and start rot from the inside out.
Proper airflow underneath the deck — low decks tight to damp ground with no ventilation gap are one of the most common problems we find on older structures out this way.

Ledger Attachment

Where the deck attaches to the house, the ledger board needs proper flashing that directs water away from the house rim joist, not just a bead of caulk. This is one of the most common points of hidden rot on older decks in wet climates, and it is worth doing right the first time rather than opening up a wall later.

Fasteners and Spacing

Composite boards expand and contract with temperature more than people expect. Hidden fastener systems and correctly spaced gapping allow the boards to move without buckling and let water drain through rather than pool on the surface. Face-screwing composite the same way you would wood decking is a common shortcut that leads to squeaking, board movement, and a rougher-looking deck within a couple of years.

Composite vs. Other Decking Materials

Material	Moisture Resistance	Moss/Algae Resistance	Maintenance	Typical Lifespan
Pressure-treated wood	Moderate — absorbs water, needs sealing	Low without regular cleaning	Annual cleaning and re-sealing	10–15 years
Cedar	Moderate — natural oils help but fade over time	Low to moderate	Regular oiling or staining	12–18 years
Uncapped composite	Good	Moderate	Occasional cleaning	15–25 years
Fully capped composite	Very good	Good	Low — periodic rinsing	25–30+ years (per manufacturer warranty)
PVC decking	Excellent	Good	Low	25–30+ years

PVC decking is worth mentioning because it is fully synthetic and handles moisture even better than composite. We install it when a homeowner wants the lowest possible maintenance and is comfortable with the higher material cost and a slightly different look and underfoot feel than composite. For most Conway homes, fully capped composite hits the right balance of moisture performance, appearance, and cost.

The Moss and Algae Problem, Specifically

A long moss season is not just a roof problem. Decks that sit in shade — under trees, on the north side of a house, or close to the ground — collect the same spores that colonize a roof or a fence line. On wood, those spores find a foothold in the grain and are difficult to fully remove without damaging the board. On capped composite, the smooth, non-porous surface gives organic growth much less to grab onto, and what does grow can usually be rinsed or lightly scrubbed off rather than pressure-washed aggressively enough to damage the board.

That said, no decking material is immune to organic growth if it never gets sun or airflow. Deck placement, gap spacing between boards, and keeping nearby vegetation trimmed back all matter as much as the material choice itself.

Our Installation Process

On-site assessment — we look at the existing structure (if replacing an old deck), soil and drainage conditions, sun and shade exposure, and how the new deck will tie into the house.
Design and material selection — board pattern, fastening system, railing style, and composite tier (capped vs. fully capped) based on your budget and how exposed the deck will be.
Permitting — decks above a certain height or attached to the home typically require a permit through the applicable Skagit County or local building jurisdiction; we handle that process rather than leaving it to you.
Demolition and disposal of the old deck, if applicable, including a check for hidden rot at the ledger and framing before we build over it.
Framing to code, with treated lumber, proper footings, and joist protection tape installed before any decking goes down.
Ledger flashing installed correctly at the house connection to prevent water intrusion behind the siding.
Composite board installation with the fastening system specified by the manufacturer, correct gapping, and attention to expansion joints on longer runs.
Railing, stairs, and trim installed and finished, followed by a final walk-through with you.

Local Factors We Account For in Conway

Conway's setting in the Skagit Valley floodplain means ground moisture and drainage are a bigger factor here than on a hillside lot closer to Anacortes proper. A few things we routinely check on decking projects in this area:

How close the deck framing sits to grade, and whether there's enough clearance for airflow and future inspection.
Whether existing drainage around the house directs water toward or away from the deck footings.
Salt-laden air moving up from Skagit Bay, which accelerates corrosion on cheap fasteners and hardware — we use stainless or coated fasteners rated for coastal exposure.
Surrounding tree cover and farmland shade patterns that keep certain areas of a deck damp longer than others, which affects board placement and gapping decisions.

Pre-Project Checklist for Homeowners

If you're planning a composite deck in Conway, it helps to think through these before we come out for an estimate:

Is this a new deck or a replacement of an existing structure?
Do you know the age and condition of any existing framing or footings?
Is the deck attached to the house, freestanding, or built over a lower patio?
How much sun versus shade does the area get through the day?
Are there drainage issues nearby — standing water, soggy ground, or runoff from a roofline?
What's your priority: lowest maintenance, closest look to real wood, or lowest upfront cost?

Why a Crew That Works This Area Matters

Composite decking installation is not exotic work, but it is unforgiving of shortcuts in a climate like this one. A crew that mostly builds decks in drier parts of the state may not think twice about ventilation gaps, ledger flashing, or fastener corrosion resistance — because where they usually work, those details matter less. Out here, skipping them is how a deck that looks fine for two years starts showing soft framing, staining, or a loose ledger board by year five.

We build and repair decks across the Anacortes and greater Skagit County area, including Conway, and we build every one of them assuming the wettest, mossiest winter the site will see, not the driest summer week. That means the framing, flashing, and fastening choices are made for the long haul, not just for how the deck looks on installation day.

If you're considering composite decking for a home in Conway, we're happy to come take a look, walk the site, and give you a straightforward estimate — no pressure, no upsell. Use the form below to get started.