Blaine Decking in Custer Has to Handle More Than Foot Traffic
Custer sits close enough to the water and open farmland that decks here take a beating most inland homes never see. Salt-laden air drifts in off the Strait, wind-driven rain comes in sideways more often than straight down, and the long gray stretch from October through April keeps every horizontal surface damp for days at a time. That combination is exactly what wears out a deck early — not one big storm, but months of low-grade moisture and salt exposure that most decking products, and a lot of installation work, simply weren't built around.
Composite decking earns its keep in this climate when it's specified and installed correctly. It also fails in ways that are entirely preventable when it isn't — trapped moisture under boards, fasteners that corrode and streak the surface, framing that was never rated for the assembly sitting on top of it. This page covers what a Custer deck actually needs, what a correct composite installation looks like, and how we handle the job from first look to final walkthrough.
What Whatcom County's Climate Does to a Deck
Salt Air and Fasteners
Homes closer to the water deal with airborne salt settling on every exterior surface, including deck hardware. Standard coated screws and brackets corrode faster here than they would twenty miles inland, and once a fastener starts rusting, it stains the decking around it — a problem you can't clean off, only cover up or replace. This is a hardware decision, not a decking-board decision, and it's one of the most common corners cut on lower-bid deck jobs.
Driving Rain and Standing Water
Rain that comes in at an angle finds its way under rail caps, into unsealed post bases, and along ledger boards that weren't flashed properly. Composite boards themselves don't rot, but the framing underneath them — the joists, beams, and ledger connection to the house — is almost always still wood, and that wood needs the same drainage planning a roof would get. A deck that looks fine on top can be quietly failing underneath if water has nowhere to go.
The Long Moss Season
Whatcom County's wet season runs long, and moss and algae take hold on any surface that stays damp and shaded — decking included. Composite boards vary a lot in how well they resist this. Cheaper, uncapped composite has an open surface texture that moss and mildew can grip into over a few seasons. Fully capped boards with a factory-sealed surface shed that growth far better and stay cleanable with nothing more than a deck brush and mild soap.
Composite vs. Wood Decking for This Area
Both materials have a place, and we install both. The honest comparison for a Custer property, where moisture and moss pressure are high, looks like this:
| Factor | Composite (capped) | Cedar / Pressure-Treated Wood |
|---|---|---|
| Moisture resistance | Boards themselves don't absorb water or rot | Needs sealing on a regular schedule to resist rot |
| Moss/algae resistance | Sealed surface sheds growth, easy to brush clean | Open wood grain holds moisture, grows moss faster |
| Maintenance | Occasional wash, no staining or sealing | Sanding, staining, or sealing every 1-3 years |
| Upfront cost | Higher material cost | Lower material cost |
| Lifespan in this climate | Long service life with minimal upkeep | Shorter functional life without consistent maintenance |
| Appearance over time | Consistent color, fade-resistant surface | Grays and weathers unless refinished |
Where a homeowner wants the lowest upfront cost and doesn't mind a maintenance routine, cedar or treated wood is still a reasonable choice, and we'll say so plainly. Where the goal is to stop dealing with the deck every spring, composite is the better fit for this climate — that's a maintenance-burden tradeoff, not a claim that wood decking is a bad product.
What a Correct Composite Installation Actually Involves
The decking board is the part homeowners see, but it's the least likely part of a deck to fail. Problems almost always trace back to what's underneath or how the boards were fastened. A correct job includes:
- Ledger flashing: Where the deck attaches to the house, proper flashing keeps water from tracking behind siding and into the wall structure — this is one of the most common failure points on older decks we're asked to rebuild.
- Joist protection: Composite manufacturers require a moisture barrier tape over the joists so the framing lumber underneath isn't sitting in standing water every winter.
- Proper drainage slope: The deck surface needs a slight pitch away from the house so rain sheets off instead of pooling against the ledger.
- Correct board spacing: Composite expands and contracts with temperature more than wood. Gaps that are too tight buckle in summer heat; gaps too wide catch debris and moss.
- Hidden or corrosion-rated fasteners: Stainless or coated fasteners rated for coastal exposure, matched to the board manufacturer's specs so the warranty stays valid.
- Ventilation underneath: Enough clearance below the deck for air to move and moisture to evaporate, rather than sitting trapped against the joists.
Skip any one of these and the deck can still look right for a year or two. In this climate, that's usually about how long it takes for the shortcut to show up as a soft spot, a stain, or a board that's started to cup.
Board and Rail Choices That Make Sense Here
Not every composite product is built the same way, and the differences matter more in a salt-air, high-moisture climate than they would somewhere dry. We install boards from established manufacturers — Trex, TimberTech, and Fiberon are the names most homeowners recognize — and steer selection based on how the product is built, not just the price point:
- Fully capped composite: A protective polymer shell wraps the board on all sides. This is what actually resists moss, staining, and moisture absorption over time — it's our default recommendation for anything exposed to Custer's weather.
- Uncapped or partially capped composite: Lower upfront cost, but the exposed wood-plastic core is more porous and shows moss and mildew growth sooner. We'll install it if that's what a budget calls for, but we explain the tradeoff up front.
- Rail systems: Aluminum or composite-clad rail holds up better than painted wood rail in salt air, since it doesn't need repainting to keep water out of the joints.
- Hidden fastener clips: Keep the surface free of exposed screw heads, which is where corrosion staining shows up first on a coastal deck.
Cost Factors for a Custer Composite Deck
Every deck is priced around its own footprint, framing condition, and material tier, so we won't quote a number without seeing the site. What actually moves the price is fairly consistent:
| Factor | Why It Matters |
|---|---|
| Existing framing condition | Rotted or undersized joists need replacement before decking goes down — common on older decks near the water |
| Board tier (capped vs. uncapped) | Fully capped boards cost more upfront but need far less upkeep in this climate |
| Deck height and railing requirements | Elevated decks need code-compliant railing and sometimes stairs, adding material and labor |
| Ledger and flashing work | Proper flashing at the house connection is non-negotiable and adds time, not optional cost to skip |
| Footprint and shape | Cutouts, multiple levels, and picture-frame borders add labor beyond a simple rectangle |
We'll walk the existing structure with you, point out anything that needs to be addressed before new decking goes on, and give a written estimate that separates framing repairs from the decking itself so you know exactly what you're paying for.
Our Process, Start to Finish
- On-site assessment: We check the existing framing, ledger connection, and drainage path, and measure for material.
- Written estimate: A clear breakdown of framing work, decking material, railing, and labor — no vague allowances.
- Framing and flashing: Any repairs, ledger flashing, and joist tape go in before a single deck board is placed.
- Decking and rail installation: Boards fastened per manufacturer spec with corrosion-rated hardware, correct spacing, and proper slope.
- Final walkthrough: We check the surface, rail, and fastener lines with you before calling the job done.
Keeping It Clean Through Moss Season
Composite decking cuts down on maintenance, but it's not zero-maintenance, especially with Whatcom County's wet stretch running most of the year. A short seasonal routine keeps a capped composite deck looking new for a long time:
- Sweep or blow off debris regularly — wet leaves and needles left sitting are what feeds moss growth on any surface.
- Wash with a soft-bristle deck brush and mild soap once or twice a year, more often on shaded sections.
- Avoid pressure washing directly into board seams or fastener points — it can drive water where it doesn't belong.
- Keep planters and furniture feet off direct contact with the board surface to prevent trapped moisture spots.
- Check railing post bases and stair stringers each fall for any sign of water pooling before the wet season sets in.
Why Hire a Crew That Already Works This Area
Decking crews that mostly work drier inland regions don't always plan for what Custer's climate does to a deck over time — the flashing details, the fastener spec, the framing ventilation. Our crew is based in Blaine and works Whatcom County's coastal side regularly, so the drainage and hardware decisions on this page aren't theoretical to us; they're what we build into every deck we put up out here. We also know the local permitting expectations for railing height and footing depth, which keeps the project moving instead of stalling on a plan revision.
If you're weighing composite decking for a home in Custer, we're glad to come take a look, walk the existing structure or the space you're planning to build on, and put together a straightforward, no-pressure estimate. There's a form below — reach out and we'll get a time on the calendar.