Lynden Siding Building a Deck That's Actually Meant for Custer
A deck built to a generic spec sheet and a deck built for a specific property in Custer are not the same project, even if they look identical from the driveway. Custer sits up in the northwest corner of Whatcom County, close enough to the water that salt-laden air is a routine part of the exposure on a lot of properties here, not just the ones with a water view. Add in wind-driven rain that doesn't fall straight down for most of the year, and a moss and mildew season that runs long because temperatures stay mild and moisture stays constant, and you've got three separate forces working against an outdoor structure at the same time. None of them is dramatic on its own. Stacked together over a decade or two, they're a harder test than most standard deck-building advice is written for.
This page is about that one job, in this one area: what a deck actually needs to hold up here, what a correct build involves from the footings up, and how our process works when we take on a Custer project. It's not a generic "how to build a deck" primer — it's the version specific to this climate and this stretch of Whatcom County.
What Salt Air, Driving Rain, and Moss Actually Do to a Deck
Each of these three conditions attacks a different part of the structure, and understanding which part helps explain why some of the choices below aren't just preference.
Salt Air
Salt exposure speeds up corrosion on metal fasteners, joist hangers, and any hardware that isn't rated for it. A deck that looks fine on the surface can have fasteners quietly weakening underneath if the wrong grade of hardware went in during the build. This is one of the most common causes of premature structural problems we see on older decks in this part of the county.
Wind-Driven Rain
Rain that gets pushed sideways finds its way into ledger board connections, under railing posts, and into any seam where flashing or sealant wasn't done right. A deck's most vulnerable moisture points aren't usually the open decking boards — they're the hidden connections where the deck attaches to the house and where posts meet the ground.
A Long Moss Season
Mild, damp conditions for most of the year mean moss and algae growth is close to a year-round concern on shaded lots, which describes plenty of Custer properties with mature trees. Moss on a deck surface isn't just cosmetic — it holds moisture against the boards and creates a genuinely slick, unsafe walking surface, especially on stairs.
Choosing the Right Decking Material for This Climate
There's no single "best" decking material for every homeowner — it depends on how much maintenance you want to do and what you're willing to spend upfront versus over time. What we can do is give you a straight comparison based on how each option actually performs in a wet, coastal-influenced climate like this one.
| Material | Upfront Cost | Maintenance | Moisture & Moss Performance |
|---|---|---|---|
| Pressure-treated wood | Lowest | Annual cleaning, periodic re-staining or sealing | Decent if sealed consistently; end grain and fastener holes are the weak points |
| Cedar | Moderate | Regular staining or oiling to maintain color and protection | Naturally moisture-resistant but still organic; moss takes hold if not cleaned |
| Composite decking | Highest | Occasional washing, no staining or sealing | Doesn't absorb water or rot, but surface moss and algae still need periodic cleaning |
Composite decking has become a popular choice for Custer homeowners specifically because it removes the staining and sealing cycle from the equation, which matters in a climate where that maintenance window can get squeezed by weeks of rain. That said, plenty of homeowners still prefer the look and feel of real wood and are willing to keep up with the maintenance — that's a legitimate choice too, as long as it's a maintenance schedule you'll actually keep.
Framing and Substructure: Where Decks Actually Fail First
The decking boards are the part everyone sees, but the framing underneath is what determines whether a deck lasts fifteen years or thirty. This is also where a rushed build shows up years later as a soft spot, a wobble in the railing, or worse.
Ledger Board Attachment
The ledger board — where the deck ties into the house — is the single most important structural connection on most residential decks, and it's also the connection most exposed to water intrusion if it's not flashed correctly. We treat ledger flashing as non-negotiable, not an optional upgrade.
Footings and Post Bases
Footings need to be set below frost depth and sized for the load they're carrying, and post bases should keep the wood post itself elevated off the concrete so it isn't sitting in standing water after a heavy rain. In a climate where the ground stays saturated for stretches of the year, this detail matters more than it would in a drier region.
Joist Hangers and Fasteners
Given the salt air factor discussed above, we use hardware rated for coastal or high-corrosion exposure rather than standard interior-grade fasteners. It costs a bit more upfront and it's the difference between hardware that's still sound in twenty years and hardware that's rusting through in ten.
Railings, Stairs, and the Details That Get Overlooked
Railings and stairs take direct weather exposure and heavy daily use, which makes them a common weak point on decks that otherwise look solid. Loose railing posts are one of the most frequent issues we find on older decks around Custer, usually traced back to a post that was never properly through-bolted or a base that's been sitting in moisture. Stair treads are also where moss buildup turns from a nuisance into a safety issue, since a mossy stair tread is genuinely slick underfoot, especially in the wetter months.
Code requirements for railing height, baluster spacing, and stair geometry aren't just bureaucratic boxes to check — they reflect real safety research, and we build to them as a baseline rather than a minimum to shave down.
Our Deck Building Process
We walk every Custer deck project through the same sequence, whether it's a full rebuild or new construction:
1. On-Site Walk and Design Conversation
We look at the specific lot — sun exposure, tree cover, drainage, and how close the property sits to prevailing wind and moisture. That site-specific read is what shapes our material and detailing recommendations, rather than a one-size-fits-all package.
2. Permitting
Most deck projects above a certain size or height require a permit through the local jurisdiction. We handle that process as part of the job so you're not left figuring out permit requirements on your own.
3. Demolition and Site Prep (if applicable)
For a rebuild, we remove the old structure and check the condition of anything we're not replacing, including the ledger connection and the framing behind it, before any new material goes up.
4. Framing and Structural Build
This is where the footings, posts, ledger flashing, and joist framing come together, using corrosion-resistant hardware appropriate for this area's exposure.
5. Decking, Railings, and Finish Work
Decking boards, railings, and stairs go on last, along with any finishing (staining, sealing) the material calls for.
6. Final Walkthrough and Inspection
We walk the finished deck with you, and where a permit was pulled, the project goes through the required inspection before it's considered closed out.
Keeping a Custer Deck in Good Shape Year-Round
A well-built deck still needs some ongoing attention in this climate, especially with a moss season that runs long. Here's a basic maintenance checklist we give homeowners, regardless of which material they chose:
- Sweep debris and standing leaves off the deck surface regularly, especially in fall, so moisture doesn't sit trapped against the boards.
- Clean visible moss and algae buildup at least once or twice a year, more often on shaded sections of the deck.
- Check railing posts and stair stringers periodically for looseness, which is often the first sign of a fastener or connection issue.
- For wood decking, keep to a realistic staining or sealing schedule rather than letting it lapse for several seasons.
- Keep gutters and downspouts near the deck clear so runoff isn't draining directly onto or under the structure.
- Watch for any darkening or soft spots at the ledger board connection, which can indicate hidden moisture behind the flashing.
Why Hiring a Crew That Already Works Custer Matters
A lot of deck-building advice online is written for a generic climate, and a lot of contractors treat every project as the same build regardless of where it sits. The framing and hardware decisions that matter for a dry, inland property aren't necessarily the ones that matter here. A crew that's worked on decks throughout this part of Whatcom County has already seen which fastener grades hold up, which ledger details fail first, and which materials actually handle a long wet season without turning into a maintenance headache. That's not a marketing point — it's the practical result of having repaired and rebuilt decks in this specific set of conditions rather than just building to a national average spec.
Get a Free, No-Pressure Estimate
If you're thinking about a new deck, a rebuild, or repairs to an existing one in Custer, we're glad to come take a look, talk through the site-specific factors on your property, and give you a straightforward recommendation. Use the form below to schedule a free estimate — no pressure and no upsell script.