How is composite decking different from PVC decking?

Composite decking blends wood fiber with plastic, giving it a more natural wood-like look and feel, while PVC decking is fully synthetic with no wood content, making it slightly more resistant to moisture absorption. Both need proper substructure and airflow to perform well in a wet climate like ours. The right choice usually comes down to appearance preference and budget rather than one being universally superior.

How do I know if a contractor is actually qualified to build a deck, not just install railing and boards?

Ask whether they inspect and, if needed, reinforce the substructure before installing new decking, since composite boards are heavier than wood and older frames aren't always rated for the extra load. A qualified contractor should also handle permitting and be able to explain their flashing and fastener choices without hesitation. If they only talk about the visible boards and skip the framing conversation, that's a red flag.

Do all composite decking brands perform the same in wet, shaded areas?

No — capped composite boards resist moisture and mildew better than uncapped boards, and that difference shows up fastest in shaded, low-airflow spots. Grooved-edge boards can also hold more moisture and debris than solid-edge boards in the same conditions. We match the board type to the specific site rather than defaulting to one product for every yard.

Why does composite decking still get moss if it doesn't rot like wood?

Moss doesn't need the board to rot, it just needs a damp, shaded surface with enough texture to grab onto, and composite boards can provide that just as easily as wood if airflow and drainage aren't addressed. Grooved boards and low-clearance installs are especially prone to it. Good design — spacing, ventilation, and drainage — matters more than the material itself for keeping moss at bay.

Does Burlington's proximity to the water actually affect deck hardware, not just the boards?

Yes — the mild salt-air influence from nearby Puget Sound waters accelerates corrosion in standard fasteners and hidden clips faster than most homeowners expect. Hardware that's simply labeled "exterior grade" isn't always rated for that level of exposure. Using coastal-rated fasteners and brackets is a small cost difference upfront that prevents hidden hardware failure years down the line.

Composite Decking Installation in Burlington, WA

Decking Built for Burlington's Weather, Not Just Its Backyard

Burlington sits inland from Anacortes but still gets the full weather package that comes off the Salish Sea — long stretches of driving rain, damp air that lingers under trees and eaves, and a moss season that can run from fall through spring. A deck here isn't just outdoor furniture space. It's a structure that spends most of the year wet, shaded, or both. Composite decking handles that better than wood in most cases, but only when it's installed with this climate in mind. A composite deck installed the same way you'd install one in a dry inland climate will still trap moisture, grow moss in the grooves, and fail early — the board just fails slower and quieter than wood would.

This page is specifically about composite decking installation and replacement for homes in Burlington and the surrounding Skagit County area. If you're comparing decking materials in general, that's a broader conversation — here we're focused on what it takes to get composite decking right in this specific stretch of Washington.

What Burlington's Climate Actually Does to a Deck

Moisture that doesn't leave

Skagit County's rain isn't just frequent, it's often driven sideways by wind, which means water gets pushed under railings, into end grain, and along ledger boards in ways that vertical rain wouldn't. Combined with shorter, cooler drying windows in fall and winter, moisture sits in a deck assembly for days at a time rather than evaporating in an afternoon.

Moss season is a real design constraint

Moss doesn't need standing water — it just needs shade, moisture, and a surface with enough texture to grab onto. Grooved composite boards, board gaps that are too tight, and decks built low to the ground with poor airflow all give moss exactly what it wants. A well-designed deck fights moss with spacing and airflow, not just a pressure wash every spring.

Salt air and fastener corrosion

Being close to Puget Sound waters means fasteners, brackets, and hidden hardware are exposed to a mild but constant salt-air element. Standard interior-grade screws and clips corrode faster here than the manufacturer's glossy brochure photos would suggest. This is one of the most common corners cut on cheap deck installs, and it's invisible until the hardware starts failing from underneath.

What a Correctly Installed Composite Deck Involves

Composite boards themselves are fairly forgiving compared to wood — they don't rot or splinter — but the assembly underneath and around them still has to be built for a wet climate. The board is only as good as what's holding it up.

Joist spacing matched to the board: Composite boards flex more than wood over time; manufacturers specify tighter joist spacing than a typical wood deck, especially at angles or picture-frame borders.
Proper ledger flashing: Where the deck attaches to the house, flashing has to shed water away from the wall assembly — this is the single most common source of hidden rot behind a deck ledger in our area.
Corrosion-resistant, coastal-rated fasteners and hidden clips: Given the salt-air exposure, hardware needs to be rated for it, not just "exterior grade."
Airflow underneath: Skirting, if used, needs venting. A sealed-off underdeck space traps humidity and becomes a moss and mildew incubator.
Board gapping set for our climate, not the factory default: Manufacturer gap specs are a starting point; we adjust slightly for our wetter shoulder seasons so boards have somewhere to drain and dry.
Ground clearance and drainage grading: Low decks over poor-draining soil hold moisture against the structure longer — grading and clearance matter as much as the decking material itself.

Structural checks before a single board goes down

On replacement projects especially, we check the ledger board, posts, and footings before assuming the existing substructure is worth reusing. Composite boards are heavier than wood, and an older frame built for a lighter, smaller deck sometimes needs reinforcement to carry the new material correctly and meet current code.

Choosing the Right Composite Board for This Climate

Board Type	How It Handles Our Climate	Trade-off to Know
Capped composite (cap on all sides)	Best moisture and mold resistance; handles moss season well	Higher upfront cost than uncapped composite
Uncapped composite	More prone to surface moisture absorption and mildew staining in shaded, damp areas	Lower cost, but higher long-term maintenance in our climate
Grooved-edge boards	Clean look with hidden fasteners, but grooves can hold moisture and debris	Needs more frequent cleaning in moss season
Solid-edge / square-edge boards	Shed water and debris more easily, less moss buildup between boards	Fasteners are visible or face-screwed

We don't push one brand or board line as universally "best" — the right choice depends on how shaded the site is, how much direct wind-driven rain it gets, and your maintenance expectations. What we won't do is install an uncapped, tightly grooved board in a fully shaded, low-airflow Burlington backyard and call it low-maintenance — that combination is a moss farm within a couple of seasons, regardless of brand.

Our Process for a Burlington Composite Deck

Site visit and assessment: We look at sun exposure, drainage, existing structure (if replacing), and how the deck ties into the house.
Design and board selection: Based on that assessment, we recommend board type, gapping, and substructure changes suited to the site — not just a catalog pick.
Permit handling: Deck work in Skagit County jurisdictions typically requires permitting depending on size and height; we handle that paperwork rather than leaving it on you.
Demo (if replacing): Old decking and any compromised framing is removed and hauled off.
Framing and flashing: Ledger flashing, joist work, and hardware selection happen before any composite board is installed.
Composite installation: Boards go down with correct spacing and fastening for the board type and our climate.
Final walkthrough: We go over basic maintenance expectations specific to your site's sun and shade conditions before we consider the job done.

What Composite Decking Costs and Why It Varies

Cost Factor	Why It Matters Here
Board tier (capped vs uncapped)	Capped boards cost more upfront but resist our wet, shaded conditions longer
Substructure condition	Replacement jobs on older wood-deck frames often need joist or footing upgrades to carry composite weight and meet current spacing specs
Deck size and height	Taller decks and multi-level layouts need more railing, stairs, and structural engineering
Site access	Tight side-yard access or sloped lots common in this area can add labor time
Railing and fastener hardware	Coastal-rated hardware costs more than standard exterior fasteners but avoids early corrosion

We give a firm, itemized quote after the site visit rather than a phone estimate, because the substructure condition and site drainage — both invisible from a driveway conversation — genuinely change the scope.

Maintaining a Composite Deck Through a Skagit County Winter

Composite decking is lower-maintenance than wood, not maintenance-free — that distinction matters most during moss season. A few habits go a long way:

Sweep debris off the deck regularly in fall; wet leaves left on composite boards are one of the fastest ways to get moss and staining started.
Rinse the deck surface periodically through winter, especially in shaded areas that don't get direct sun to dry naturally.
Keep gutters and downspouts near the deck clear so runoff isn't dumping extra water directly onto or under the structure.
Check underdeck ventilation isn't blocked by stored items or overgrown landscaping — airflow is your main defense against moss and mildew.
Address any moss as soon as it appears rather than waiting for spring cleaning — established moss is harder to remove without damaging the board surface.

Quick checklist before hiring anyone for a Burlington deck project

Do they inspect the existing substructure before quoting a replacement, or just quote off square footage?
Do they specify corrosion-resistant fasteners and hardware, or leave that detail vague?
Do they address ledger flashing and moisture management, or only talk about the visible boards?
Can they explain board gapping and airflow choices specific to your site's sun/shade exposure?
Are they familiar with local permitting requirements for deck work in your jurisdiction?

Why Local Experience in Burlington Matters

A crew that already works decks around Burlington and the wider Anacortes area has seen firsthand which corners get cut on cheap installs and which ones actually cause callbacks two or three winters later — usually ledger flashing, fastener corrosion, and moss buildup in low-airflow spots. That's not something you learn from a manufacturer's install guide; it's something you learn from replacing other contractors' decks after a few Skagit County winters have had their way with them. We'd rather build it right the first time than get called back to explain why it failed early.

If you're considering composite decking for a home in Burlington, we're happy to take a look at your site, talk through board options for your specific sun and shade conditions, and give you a straightforward, no-pressure estimate. There's a form below — reach out and we'll set up a time to come take a look.