Lynden Siding Composite Decking in Ferndale: Built for This County's Coastal Climate
Ferndale sits close to the water and out across the open, low-lying farmland of the Nooksack lowlands, which gives the town a specific mix of exterior conditions: salt-tinged air moving in off the Sound, wind-driven rain that doesn't fall straight down, and a moss season that can run most of the year on shaded or north-facing surfaces. A deck has no roofline or wall assembly to soften any of that — it sits outside, flat to the sky, taking the full brunt of whatever the weather does. Decking material that would hold up fine in a drier, more sheltered climate can start showing problems here within a handful of wet seasons if it isn't suited to what this specific stretch of Whatcom County actually does to an outdoor surface.
Composite decking has become the default choice for a lot of Ferndale homeowners for good reason — it's built to resist exactly the kind of sustained moisture, salt exposure, and organic growth this climate produces. But "composite" covers a wide range of products, and the difference between a well-installed board suited to this climate and a generic composite job dropped in without local considerations shows up fast here. This page covers what composite decking actually needs to perform in Ferndale, what a correct installation involves, and how our process works for this specific service in this specific area.
What Ferndale's Climate Does to a Deck Surface
Salt Air Off the Water
Even homes set back from the immediate shoreline take on a steady dose of salt-laden air moving through this part of the county. On a deck, that salt exposure works on two fronts: it accelerates corrosion in exposed fasteners and hardware, and over time it can dull or stain lower-grade surface finishes. A deck's fastening system sits fully exposed to that air with no siding or trim to shield it, which is part of why fastener grade matters as much as the decking board itself.
Wind-Driven Rain
Rain in this part of Whatcom County rarely falls straight down. Wind carries it sideways across open decks, into railing connections, and between boards that aren't gapped correctly for drainage. A composite deck surface that would shed water fine on a calm day can still end up holding moisture at the board edges and fastener points once wind gets involved — and in Ferndale's open, lower-lying terrain, wind has fewer obstructions to slow it down before it reaches a house.
A Long Moss Season
Mild temperatures and near-constant moisture give moss and mildew a long growing season across this part of the county, and a horizontal deck surface is one of the first places it takes hold — it holds water longer than a vertical wall and stays damp between rain events. Shaded decks and boards under trees are usually first to show it, and even composite boards with some surface texture can give moss something to grip if the cap layer and finish aren't suited to sustained damp conditions.
Why Composite Decking Fits This Climate
Composite decking is built from a blend of wood fiber and recycled plastic, and in most modern products that core is wrapped in a protective plastic cap layer. That cap is what actually does the work in a climate like Ferndale's — it keeps moisture, salt residue, and organic growth from getting into the wood fiber underneath, which is the part of a composite board that would otherwise behave a lot like ordinary wood. Not all composite is capped the same way, and that difference matters more here than it would in a drier climate.
| Decking Material | Handling Salt Air & Moisture | Moss Resistance | Typical Upkeep |
|---|---|---|---|
| Capped composite | Strong — cap layer blocks moisture and salt residue from the wood-fiber core | Good on most current product lines | Periodic washing |
| Uncapped or corners-only capped composite | Moderate — exposed fiber at cut ends and fastener holes can absorb moisture | Fair; more prone to buildup over seasons | Regular cleaning, more attention at cut edges |
| Cellular PVC | Excellent — no wood fiber at all to absorb moisture | Strong, smooth non-porous surface | Occasional washing |
| Pressure-treated or cedar wood | Weak to moderate against sustained salt exposure over time | Poor without regular sealing | Regular sealing or staining |
We install fully capped composite decking as our standard for Ferndale projects, and we'll walk you through PVC as an alternative where a homeowner wants added moisture resistance and is comfortable with the added cost. What we steer away from is uncapped or partially capped composite in this climate — the up-front savings tends to shift into higher maintenance and a shorter usable life once salt air and sustained moisture get into exposed fiber.
What a Correct Composite Decking Installation Involves
The board itself gets most of the attention when homeowners picture a composite deck, but in Ferndale's climate, what's underneath and how the boards are fastened is what actually determines how long the deck performs the way it's supposed to. A correct installation here includes:
- Pressure-treated substructure framing sized correctly for the specific composite product's span rating, not a generic joist layout
- Stainless steel or coated corrosion-resistant fasteners and hardware throughout, since salt air degrades standard hardware faster than it looks
- Hidden fastener clip systems on the board face where the product supports it, reducing exposed metal and giving a cleaner, flatter walking surface
- Correct board gapping for drainage and thermal movement, so wind-driven rain and standing moisture can actually clear between boards instead of sitting
- Proper ledger board flashing where the deck ties into the house — one of the most common places moisture gets in on a poorly built deck
- Manufacturer-specified end caps or sealant on any cut board ends, since an unprotected cut edge is where uncapped composite fiber gets exposed and starts absorbing moisture
- Ventilation and grading underneath the deck so the substructure doesn't sit in standing water between storms
Skip any of those steps and a composite deck can still look right on installation day — composite is forgiving that way. The gaps in the work usually show up a few winters later, in a soft joist, corroding hardware staining the boards around it, or moisture tracking in at a ledger connection that wasn't flashed correctly.
Choosing a Composite Board for a Ferndale Deck
Beyond capped versus uncapped, a few other product details are worth working through before settling on a specific composite line. Darker board colors absorb more heat and can run noticeably warmer underfoot on sunny days, which matters less in a climate like this one but is still worth considering for a deck that gets full afternoon sun. Grooved-edge boards are designed to pair with hidden fastener clips, while square-edge boards are typically face-screwed, which is a visible difference in the finished look as much as a functional one. Streaked or wood-grain finishes tend to hide surface dirt, pollen, and light staining better over time than solid, uniform colors, which can be a practical consideration in a climate where a deck surface collects organic debris for most of the year. None of these are one-size-fits-all choices — they depend on the specific site, sun exposure, and how the homeowner plans to use the space.
How Our Process Works
We start with a site visit to look at what's actually there — existing deck or substructure condition if it's a replacement, drainage and grade around the area, and how much sun, shade, and wind exposure the spot actually gets through the day. From there we go through composite product options that fit the budget and the way the space will get used, whether that's a small platform off a kitchen door or a larger deck built for entertaining.
Permitting for deck work in Ferndale and the rest of Whatcom County generally follows standard setback, structural, and elevation requirements, and we handle that as part of the job rather than leaving it for the homeowner to sort out. Once permitted, the build follows the sequence above — substructure and framing first, sized and fastened for what the site actually needs, then the composite decking surface, railing, and any stairs or trim. We finish with a walkthrough covering what the specific product you chose actually needs going forward, which for capped composite is minimal, but not nothing.
Caring for Composite Decking in This Climate
Composite decking is lower-maintenance than wood, not maintenance-free, and a little routine attention goes further toward a full lifespan in a climate like Ferndale's. A short list worth keeping in mind:
- Rinse or wash the deck surface periodically to clear salt residue, pollen, and organic buildup before it works into the cap layer or surface texture
- Keep gaps between boards clear of leaves, needles, and debris so water and airflow can move through the way the design intends
- Check railing posts, hardware, and any fastener clips once a year for early corrosion or loosening, especially heading into the wet season
- Trim back overhanging branches or plants that hold shade and moisture against the deck surface
- Address any soft framing, standing water, or fastener corrosion underneath right away — that's a structural issue, not a cosmetic one
Why It Matters That We Already Work Ferndale
A crew that mostly builds decks further inland can still install composite decking competently, but a Ferndale job has variables that don't come up as often elsewhere in the county — corrosion-grade fastener requirements from sustained salt exposure, wind loads tied to the area's open, low-lying terrain, and a moss season that runs longer here than it does in more sheltered towns. Working this area regularly means we're not guessing at those requirements on your project. We've seen which composite lines actually hold up against Ferndale's specific combination of salt air, driving rain, and moss, and which fastener grades and installation details are worth the extra time rather than an upsell.
That familiarity also shows up in smaller judgment calls — how to orient a deck for the wind a particular lot actually sees, or being straightforward with a homeowner about what a composite deck here realistically needs to last versus what's just an extra line item.
Get a Free, No-Pressure Estimate
Whether you're replacing an aging deck, building new, or want an honest read on what composite decking would take on your Ferndale property, we're happy to walk the site with you and lay out the options plainly. Reach out using the form below for a free, no-pressure estimate.