Anacortes Roofing Burlington sits low in the Skagit Valley, close enough to Skagit Bay to pick up salt-laden air on a regular basis, and wet enough through the fall and winter that a deck here spends more of the year damp than dry. A deck isn't just furniture sitting on top of your yard — it's a structure with framing, fasteners, and a walking surface that all have to survive that exposure year after year. This page covers what composite decking actually needs to hold up in Burlington specifically, what a correct installation involves, and how we approach the work for homes in this part of Skagit County.
What Burlington's Climate Does to a Deck
Three conditions shape how a deck ages here. Salt-laden air moving inland off Skagit Bay accelerates corrosion on any exposed metal — fasteners, brackets, railing hardware — faster than it would further from the water. Driving rain from Pacific storm systems doesn't just fall straight down; it pushes sideways and works into ledger connections, joist tops, and any gap that wasn't flashed or sealed correctly the first time. And a moss season that runs long in a valley without much dry recovery time keeps shaded deck boards and substructure damp for weeks after a storm has passed, rather than a day or two.
None of these show up as a single dramatic failure. They accumulate quietly — a corroding joist hanger, a ledger board that's been absorbing water behind the house siding for two winters, a north-facing deck surface that stays slick with moss growth well into spring. By the time it's visible, the damage is usually already established.
Why This Matters More for the Substructure Than the Boards
Homeowners shopping for a deck tend to focus on the decking boards themselves, and composite boards are genuinely good at resisting moisture damage. But the framing underneath — the ledger, joists, beams, and every fastener holding them together — is still typically pressure-treated lumber and metal hardware, and that's where Burlington's climate does the most damage if it's not detailed correctly. A composite deck built on a poorly protected substructure will still fail early; it just fails underneath where you can't see it until there's a real problem.
Why Composite Decking Makes Sense Here — and Where the Trade-offs Are
Composite decking's core advantage in a climate like this is that the boards themselves don't rot, splinter, or need annual staining the way wood does. Modern capped composite boards have a plastic shell wrapped around a wood-fiber and plastic core, which keeps moisture from soaking into the board and keeps mold and mildew from getting the foothold they'd get on bare wood. In a valley that stays damp most of the year, that's a real, honest advantage — less time spent power-washing and refinishing, and no annual sealing schedule to keep up with.
It isn't maintenance-free, and we won't tell a homeowner otherwise. Composite boards can still develop surface mold or mildew film in persistently shaded, damp spots — it grows on the surface rather than into the board, but it still needs periodic cleaning to keep a deck looking good. Composite also runs hotter underfoot in direct summer sun than wood does, and it costs more up front than pressure-treated lumber, though it typically costs less over a 20-plus year span once you account for wood's recurring sealing, staining, and board-replacement costs. We think that trade-off makes sense for most Burlington homeowners given how much of the year this climate stays wet, but it's a real trade-off, not a free upgrade.
What Correct Composite Decking Installation Actually Involves
A composite deck is only as good as the frame and detailing underneath it, and that's especially true in a climate that gives moisture every chance to find a weak point.
Ledger Attachment and Flashing
Where the deck attaches to the house is the single highest-risk connection on the whole structure. It needs proper flashing that sheds water away from the house's wall assembly rather than trapping it against the ledger board, correct lag or through-bolt fastening rated for the load, and a gap or flashing detail that keeps water from wicking behind the siding above the ledger. Skip this step or flash it loosely, and you're building in a slow leak that can damage the house itself, not just the deck.
Joist Protection and Framing Layout
Every joist top and cut end should be protected with a self-adhering joist tape before boards go down, so rain that gets past the decking surface doesn't sit directly on exposed, fastener-punctured lumber. Joist spacing also needs to match the composite manufacturer's specification — composite boards typically require tighter joist spacing than wood, especially at angles or on diagonal patterns, and installing at wood-standard spacing is a common shortcut that leads to boards flexing or sagging over time.
Fastening and Board Gapping
Hidden fastener clip systems are standard on most composite installs now, giving a clean surface with no visible screw heads and better spacing consistency board to board. In a salt-air environment, the fasteners and clips themselves need to be stainless steel or a coated, corrosion-rated hardware — standard zinc-coated deck screws will corrode faster here than in a drier inland climate. Board gapping also has to account for composite's thermal expansion and for drainage; too tight and boards can buckle in summer heat or trap standing water, too loose and the deck feels sloppy underfoot.
Under-Deck Drainage and Ventilation
Composite boards don't rot, but the framing beneath them still can if air can't move underneath the deck. Skirting, when used, should include ventilation gaps rather than sealing the underside completely, and low decks close to grade need enough clearance for airflow and drainage — a detail that matters more in a valley where the ground stays saturated for long stretches of the wet season.
Composite Board Options and Cost Factors
Not all composite decking is built the same way, and the differences matter more in a wet climate than they would somewhere drier.
| Option | What It Is | Best Fit |
|---|---|---|
| Capped composite | Wood-fiber/plastic core with a plastic cap on all sides | Most Burlington homes — strong moisture resistance at a mid-range price |
| Uncapped composite | Older-style composite without a full protective shell | Rarely our recommendation here — more prone to moisture absorption and staining over time |
| PVC decking | Solid cellular PVC, no wood fiber content at all | Homeowners wanting maximum moisture resistance and don't mind a higher price point |
| Pressure-treated wood | Traditional lumber decking | Lower up-front cost for owners willing to stain and reseal on a regular schedule |
We install capped composite and PVC systems from established manufacturers such as Trex and TimberTech, and we help homeowners weigh board style, color, and price tier against how the deck will actually be used and how much sun or shade it gets — a shaded, north-facing deck and a full-sun deck in the same yard can reasonably call for different board choices.
Railings, Fascia, and Finishing Details
The railing system and fascia boards take as much weather exposure as the decking surface, sometimes more, since vertical railing posts and balusters catch driving rain directly. We match railing hardware to the same corrosion standard as the deck fasteners, use fascia board or composite trim that resists the same moisture and moss exposure as the decking itself, and detail post bases so water sheds away from the base connection rather than pooling around it. A deck that looks finished from a distance but was detailed with mismatched, lower-grade railing hardware tends to show corrosion and loosening at the railing years before the decking surface shows any wear at all.
Our Process From Estimate to Completion
We start with an on-site look at the actual conditions your deck will face — sun exposure, shade patterns, existing drainage, and the condition of anything we're building onto or replacing. From there:
- We walk the site and discuss board options, layout, and railing style based on how you actually use the space.
- We handle permitting through the appropriate local jurisdiction where required, since deck permits and inspections apply in most of Skagit County depending on size and height.
- We remove or prepare the existing structure, inspecting ledger and framing condition before building or reinforcing the substructure.
- We install joist protection, correct fastening, and manufacturer-specified spacing before boards go down.
- We install decking, railings, and fascia, then do a final walk-through with you before we consider the job finished.
Maintenance: What Composite Decking Still Needs in This Climate
Composite decking cuts down maintenance significantly compared to wood, but "low-maintenance" isn't "no-maintenance," especially in a valley with this much moss and moisture exposure.
- Sweep debris and organic buildup off the surface regularly, especially in shaded areas where moss and algae film can develop
- Wash the deck surface periodically with soap and water or a manufacturer-approved cleaner to prevent surface mold buildup
- Keep gutters and downspouts near the deck clear so runoff isn't concentrating extra water onto or under the deck
- Check railing hardware periodically for corrosion, especially on decks with more direct exposure to weather
- Trim back vegetation that keeps a section of the deck shaded and damp longer than the rest
Why Hiring a Crew That Already Works in Burlington Matters
Deck failures in this region rarely come from the composite boards themselves — they come from substructure details that were built to a generic, drier-climate standard instead of what a Skagit Valley property actually needs. A crew that already works in Burlington knows the local permitting process, has already seen what happens to decks built without proper ledger flashing or joist protection in this climate, and is set up to detail the substructure correctly the first time rather than treating this as a one-size-fits-all build. That local track record is also what stands behind the work after the crew leaves — a company with an ongoing presence in the area has a real incentive to get callbacks right, not just close out the job.
What to Check Before You Sign a Deck Contract
- Does the quote specify board brand, line, and color — not just "composite decking"?
- Is ledger flashing and joist protection tape explicitly included, not assumed?
- Are fasteners and railing hardware specified as corrosion-resistant for a coastal-influenced climate?
- Does the contractor handle permitting, or is that left to you?
- Is there a clear warranty on both materials and labor, and who do you call if something needs attention later?
If you're considering a new composite deck or replacing an aging one in Burlington, we're happy to walk the site with you and put together a straightforward, no-pressure estimate — just fill out the form below.