Ferndale Siding Marietta Sits Close to the Water, and It Shows on a Deck
Marietta is a low-lying, water-adjacent community on the western edge of Ferndale, and homes here tend to catch more of what Whatcom County's coastal weather has to offer than properties set further inland. Salt-laden air moves through steadily, driving rain comes in with real force during fall and winter storms, and the mild, damp conditions that define this part of the county keep moss and mildew active for most of the year rather than just a few wet months. A deck has no roofline or wall to shelter it from any of that — it sits directly in the weather, year-round, which is exactly why decking choice and installation quality matter more here than in a drier, more sheltered spot.
Composite decking exists specifically to handle that kind of exposure better than wood does, but the category covers a wide range of quality and construction. This page covers what a Marietta deck actually needs from a composite decking system, what a correct installation involves given the local climate, and how we approach the job as a crew that's already familiar with this specific stretch of Ferndale.
What Marietta's Climate Actually Does to a Deck
Salt Air and Sustained Moisture
Salt-laden air accelerates corrosion in anything metal — screws, brackets, post hardware, railing connectors — and it settles into a deck's surfaces continuously, not just during storms. A fastener that starts corroding loses holding strength well before it looks obviously bad, and on a structure people walk and stand on, that's a real concern rather than a cosmetic one. Combined with the sustained dampness typical of a waterside location, that salt exposure also works its way into any material that isn't built to shed moisture rather than absorb it.
Driving Rain
Storms in this part of Whatcom County rarely drop rain straight down. Wind pushes it sideways, up under railings, and into ledger connections and gaps between boards that aren't spaced correctly. A decking surface that would shed water fine in calm, dry conditions can still trap moisture the moment wind gets involved, and in Marietta that wind-driven pattern shows up more often than it does in more sheltered neighborhoods.
A Moss Season That Runs Most of the Year
Mild temperatures and near-constant moisture give moss, algae, and mildew a long growing season here, 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 north-facing surfaces are usually first to show it, and any decking material with even a little surface porosity gives moss something to grip onto.
What "Composite Decking" Actually Means
Composite decking is generally a blend of wood fiber and plastic, but the ratio, plastic type, and finish vary considerably between manufacturers and product lines. Two distinctions matter most for a property like this:
Capped vs. Uncapped
Capped composite boards have a plastic shell wrapped around the wood-plastic core, which resists moisture absorption, staining, and UV fade far better than uncapped composite. In a salt-air, high-moisture environment like Marietta, that cap layer is doing real work rather than just adding a marketing claim — it's the difference between a board that needs occasional washing and one that eventually needs sealing and touch-up like wood does. We install capped composite as our standard for this reason.
How It Compares to Wood and PVC
Wood is the traditional choice and can look good when new, but it needs regular sealing or staining to hold up against sustained moisture and is more vulnerable to moss and fastener corrosion issues over time. Cellular PVC decking contains no wood fiber at all, so it resists moisture absorption even better than capped composite, though it typically costs more and can flex more under heavy point loads. The table below lays out how the main options stack up for a climate like this one.
| Material | Moisture & Salt Air Handling | Moss Resistance | Ongoing 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 absorption at exposed fiber and cut edges | Fair; more prone to buildup over time | Periodic cleaning |
| Cedar or pressure-treated wood | Weak to moderate against sustained moisture and salt exposure | Poor without regular treatment | Regular sealing or staining |
What a Correct Installation Requires in This Location
The visible decking boards get most of the attention, but in Marietta's conditions the framing, fasteners, and drainage details underneath are what actually determine how long the deck lasts. A build done right here includes:
- Framing material rated for sustained moisture exposure, sized correctly for the span and load rather than a generic layout
- Corrosion-resistant fasteners throughout — standard hardware starts corroding in salt air within a few seasons and takes holding strength with it
- Hidden fastener systems on the decking surface where the product allows, reducing exposed metal and giving a cleaner walking surface
- Correct board gapping so wind-driven rain and surface moisture can actually drain and dry between boards instead of sitting
- Proper ledger board flashing where the deck ties into the house, since that connection is one of the most common places moisture gets into a poorly built deck
- Joist spacing matched to the specific decking product's span rating, not a one-size layout used on every job
- Grading and airflow underneath the deck so moisture doesn't sit against the framing between storms
Skip any one of those and the deck will usually still look fine when it's finished. The problems tend to show up a few winters later — a soft joist, a loosening railing post, or corrosion stains bleeding through around a fastener.
Problems We Run Into on Existing Decks in This Area
On service calls and replacement jobs near Ferndale and Marietta, a handful of issues come up repeatedly. Boards installed with too little gap trap standing water and start showing moss and discoloration within a season or two. Ledger connections without proper flashing let water track behind the band board and into the house framing, often for years before it's visible from outside. Standard, non-coastal fasteners corrode and stain the decking around them, and sometimes lose enough grip to loosen railings or boards. And uncapped or lower-grade composite that wasn't matched to this climate tends to show fading, surface wear, and moss buildup noticeably faster than a comparable capped product would have. None of these are unusual failures — they're what happens when a deck built for an average climate gets installed in a place that isn't average.
Our Process for a Marietta Composite Deck
- Site visit and assessment. We look at the existing structure if it's a replacement, drainage and grade around the deck area, sun and shade exposure through the day, and how directly the site faces prevailing wind and weather.
- Material and layout discussion. We walk through composite and PVC options that fit the budget and how the space will actually get used, along with railing style and any stairs.
- Tear-out, if needed. Old decking and, where necessary, compromised framing come out and get inspected so nothing gets buried under a new surface.
- Framing and substructure work. Joists, ledger flashing, and fastening get built or repaired to the standard above before any decking goes down.
- Decking installation. Boards go down with correct spacing, hidden fasteners where the product supports them, and attention to how the finished surface will drain.
- Final walkthrough. We cover what your specific material actually needs going forward, which for most modern composite is minimal, but not nothing.
What Affects the Cost of a Composite Deck Here
Every deck quote is specific to the site, but a few factors consistently move the price up or down. Broadly, a composite deck installed in this area runs somewhere in the range of $40 to $75 per square foot depending on the factors below — your actual quote will depend on the details of your project, and we'll walk through them during the estimate rather than quoting off square footage alone.
| Cost Factor | How It Affects the Price |
|---|---|
| Deck size and shape | Larger and more complex shapes mean more material and labor; simple rectangles cost less per square foot than multi-angle designs |
| Substructure condition | A replacement over sound existing framing costs less than a full tear-out and rebuild |
| Decking tier | Entry-level capped composite costs less than premium composite or PVC lines |
| Railing type | Composite or metal railing systems add more cost than basic wood or cable options |
| Height and stairs | Elevated decks and multi-level designs add framing, railing code requirements, and labor |
| Permitting | Decks attached to the house or above a certain height typically require a permit through the City of Ferndale or Whatcom County, which adds time and a fee to the project |
Keeping a Composite Deck Looking Right in This Climate
Composite decking needs far less upkeep than wood, but "low-maintenance" isn't "no-maintenance," especially with a moss season that runs most of the year. A short list worth keeping in mind once your deck is built:
- Rinse or wash the deck surface periodically to clear pollen, salt residue, and organic buildup before it works into the cap layer
- Keep gaps between boards clear of leaves and debris so water and airflow can move through the way the design intends
- Check railing hardware 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, staining at fasteners, or standing water underneath right away — those are structural signs, not cosmetic ones
- Avoid dragging planters, grills, or furniture with unpadded feet across the surface, which can scuff the cap layer over time
Why It Matters That We're a Ferndale Crew Who Already Works Marietta
A crew that mostly builds decks further inland can still put one together competently, but a Marietta job has variables that don't come up as often elsewhere — sustained salt exposure from the site's water proximity, wind-driven rain patterns tied to its exposure, and moss pressure that runs longer here than in more sheltered parts of Whatcom County. Working this area regularly means we're not guessing at those requirements on your project. We've seen which decking lines and fastener grades actually hold up to Marietta's specific combination of conditions, and we're straightforward about what's worth the extra cost versus what's just an upsell. Being based in Ferndale also means a shorter drive if something needs a warranty check down the road, rather than waiting on a crew based somewhere else in the county.
Get a Straight Answer About Your Deck
Whether you're replacing a tired deck, building new, or just want an honest read on what a composite deck would take on your Marietta property, we're happy to walk the site with you and lay out the options plainly. Reach out below for a free, no-pressure estimate.