Ferndale Siding Composite Decking for Kendall Homes
Kendall sits inland from the coast, up in the wooded Nooksack River valley in Whatcom County, and that setting shapes what a deck out here actually has to deal with. Properties in this part of the county tend to sit under heavier tree cover than homes closer to Bellingham Bay, with more shaded ground and less direct sun reaching the yard through much of the year. Add in the driving rain that moves through this region regularly and a moss season that runs long even by Pacific Northwest standards, and a deck built without those specifics in mind tends to show problems faster than homeowners expect.
Composite decking has become the material most Kendall homeowners land on once they've dealt with a wood deck that needed sanding and sealing every year or two, or watched moss take hold on a shaded section faster than they could keep up with it. This page covers what composite decking actually needs to perform well in Kendall's specific climate, what a correct installation involves, and how our process works for a project in this part of the county.
What Kendall's Climate Does to a Deck
Driving Rain and Valley Dampness
Weather systems that move through Whatcom County carry a lot of moisture, and while the salt air that coastal towns deal with fades by the time storms reach the Nooksack valley, the rain itself doesn't let up much. Kendall's valley setting holds humidity a little longer after a storm passes than an open, wind-exposed site would, and a deck sitting low near the river or tucked against a tree line often stays damp well after the rest of the yard has dried out. Decking that doesn't drain and dry quickly stays wet longer here than most homeowners expect.
Deep Tree Shade
Kendall properties tend to have more mature tree cover than in-town lots, and a deck built under or near that canopy gets less direct sun to dry it out between rain events. Shade also means a steady drop of needles, leaves, and debris onto the deck surface and into the gaps between boards, which holds moisture against the decking itself if it isn't cleared regularly. A material that handles standing moisture poorly is at a real disadvantage on a shaded Kendall lot.
A Long Moss and Algae Season
Put sustained dampness and heavy shade together and you get a moss and algae season that runs longer here than in more open, sun-exposed parts of the county. It shows up first on the north-facing or most heavily shaded sections of a deck, and on a porous surface it doesn't just sit on top — it holds moisture against the material underneath, which is how a deck starts to soften and fail well before it looks obviously old.
Cooler Nights and Freeze-Thaw Swings
Sitting further inland and at slightly higher elevation than the coastal parts of the county, Kendall sees colder overnight temperatures and more frequent frost than towns right on the water. Water that's worked its way into a porous decking material or an unsealed fastener hole and then freezes expands, and that cycle repeated over several winters accelerates cracking and material breakdown in a way a milder coastal climate wouldn't push as hard.
Why Composite Decking Fits This Setting
Homeowners in Kendall generally weigh three decking categories: pressure-treated or cedar wood, capped composite, and cellular PVC. Each has a place, but for a shaded, damp, moss-prone lot, the trade-offs land differently than they would on a dry, open site.
Wood
Cedar and pressure-treated lumber look good new and cost less upfront, but both need regular sealing or staining to keep moisture out, and both are the first materials to show soft spots and moss growth when that maintenance slips even one season. On a heavily shaded Kendall lot, that upkeep schedule tends to slip faster than homeowners plan for.
Capped Composite
Capped composite boards wrap a wood-fiber composite core in a plastic shell, which keeps moisture from soaking into the board the way it would with wood or uncapped composite. That cap layer is what actually matters in a shaded, damp setting like Kendall — it's the difference between a deck that needs an occasional wash and one that needs ongoing sealing to keep moisture and moss from taking hold.
Cellular PVC
PVC decking has no wood fiber at all, so there's nothing for moisture to work into even at a cut edge or fastener hole. It costs more than composite and can flex more under concentrated weight, but on the shadiest, dampest sections of a property — the kind common on wooded Kendall lots — some homeowners decide the added moisture resistance is worth it.
| Material | Handling Shade & Moisture | Moss Resistance | Upkeep |
|---|---|---|---|
| Cellular PVC | Excellent — no wood fiber to absorb moisture | Strong, smooth non-porous surface | Occasional washing |
| Capped composite | Strong — cap layer resists moisture and staining | Good on most product lines | Occasional washing |
| Uncapped composite | Moderate — some moisture absorption at exposed fiber | Fair; more prone to buildup in shade | Periodic cleaning |
| Cedar | Moderate — natural resistance, but needs sealing | Fair when sealed and maintained | Regular oiling or sealing |
| Pressure-treated wood | Weak under sustained dampness over time | Poor without regular treatment | Regular sealing or staining |
What a Correctly Installed Composite Deck Involves
Composite decking still relies entirely on what's underneath it. A board that resists moisture on its own surface won't save a deck built on undersized framing or fastened with the wrong hardware. A correct installation for a Kendall property includes:
- Framing sized and rated for the specific composite product's span requirements — composite boards generally need tighter joist spacing than solid wood
- Pressure-treated or corrosion-resistant framing lumber suited to sustained valley dampness, not a generic grade meant for drier conditions
- Corrosion-resistant fasteners throughout, since standard hardware left in contact with damp framing over years is where hidden problems start
- Hidden fastener systems on the decking surface where the product supports them, keeping exposed metal off the walking surface and giving a cleaner finish
- Correct board gapping so water can drain and air can move between boards instead of trapping moisture against the material
- Proper ledger board flashing where the deck ties into the house — one of the most common points where water gets into a wall assembly on a poorly built deck
- Grading and airflow underneath the deck so moisture doesn't sit against the framing between storms, especially on shaded, low-lying sections of a lot
Skip any of these and the deck usually looks fine for the first year or two. The shortcuts tend to show up as a soft joist, a loosening railing post, or moisture staining around fasteners a few wet seasons in — right when it's expensive to fix.
Design Considerations for Wooded Kendall Lots
Beyond material and framing, a few site-specific questions are worth working through before a Kendall composite deck gets built. Tree cover and shade patterns affect which decking color will hold up best against moss and algae, since darker colors on a heavily shaded deck can mask early growth longer than a lighter tone would. Proximity to mature trees affects how much debris the deck will collect and how often gaps between boards need clearing. Grade and drainage around the house matter just as much here as anywhere else in the county — a deck built low against a slope or near standing groundwater needs more attention to substructure ventilation than one built on well-drained, open ground. None of these are decisions that apply the same way to every lot, which is part of why we look at the actual property before recommending a layout or material.
Cost Factors for a Kendall Composite Deck
| Factor | What It Affects | Why It Matters Here |
|---|---|---|
| Composite tier | Material cost per square foot | Higher-tier capped composite resists moisture and moss longer under Kendall's shade and dampness |
| Framing condition (replacements) | Substructure repair costs before new decking goes on | Long-term dampness under an old deck can rot joists and ledger connections unseen from above |
| Site access | Labor time and equipment needs | Wooded, rural lots can have longer driveways or tighter staging areas than in-town properties |
| Grade and drainage | Substructure design and ventilation needs | Low or shaded sections of a lot need more attention to keep moisture from sitting under the deck |
| Railing and fastener grade | Material and hardware cost | Corrosion-resistant hardware costs more upfront but avoids hidden fastener failure later |
Exact pricing depends on the size, layout, and condition of the specific property, which is why we walk the site in person rather than quoting off a flat rate per square foot.
How Our Process Works
We start with a site visit to see the actual conditions — existing deck or substructure condition if it's a replacement, how much shade and tree cover the space gets through the day, drainage and grade around the build area, and how the deck will connect to the house. From there we go over composite tiers and color options that fit the budget and hold up to the amount of shade and moisture the specific spot on the property actually sees.
Permitting for deck work in Whatcom County generally follows standard setback, structural, and elevation requirements, and we handle that as part of the project rather than leaving it for the homeowner to sort out. Once permitted, we build the substructure first — framing and fasteners sized for the site's actual moisture exposure — then install the composite decking, railing, and any stairs or trim. We finish with a walkthrough covering what your specific composite product needs going forward, which is usually minimal, but not nothing.
Keeping a Composite Deck Performing in Kendall
Composite decking cuts the maintenance burden significantly compared to wood, but a deck on a shaded, damp Kendall lot still needs some routine attention to get its full lifespan out of it:
- Sweep or blow off leaves, needles, and debris regularly, especially on sections under heavy tree cover
- Wash the deck surface periodically to clear pollen, dirt, and early moss growth before it works into the board's texture
- Keep gaps between boards clear so water and airflow can move through as designed
- Check railing posts, stair connections, and any exposed hardware once a year for early corrosion or loosening
- Confirm airflow and drainage underneath the deck stay clear, particularly on shaded or low-lying sections of the yard
- Address any soft framing or persistent standing water right away — that's a structural issue underneath the decking, not something the surface material can fix on its own
Why It Matters That We Already Work Kendall
A crew that mostly builds decks on open, sun-exposed lots can still put together a competent deck, but a Kendall property brings variables that don't come up as often elsewhere in the county — tighter joist spacing for composite spans under variable shade conditions, drainage planning for low or wooded sections of a lot, and a moss season that runs longer here than it does on a drier, more open site. Working this area regularly means we're not guessing at those details on your project. We've seen which composite tiers actually hold up to sustained shade and dampness in this valley, and which framing and fastener details are worth the extra time rather than an unnecessary upsell.
That familiarity also shows up in smaller judgment calls — how to orient a deck around the trees a particular lot actually has, or being straightforward about how much upkeep a given material realistically needs once the tree cover and moisture are factored in.
If you're planning a new composite deck, replacing a tired wood deck, or just want an honest read on what your Kendall property would need, we're happy to walk the site with you. Reach out using the form below to schedule a free, no-pressure estimate.