Custer Point Roberts sits on its own peninsula, surrounded on three sides by water and cut off from the rest of Whatcom County by an international border. That geography is part of what makes it such a desirable place to build outdoor living space — and it's also exactly what makes a deck out there behave differently than a deck built inland. Salt-laden air off the Strait of Georgia, driving rain that comes in sideways off the water, and a shaded, damp shoulder season that lets moss get a foothold on almost anything wood or composite — all of it adds up over the life of a deck. A deck built to a generic spec will show its age faster here than the same deck built twenty miles inland. A deck built for this specific exposure won't.
What Point Roberts' Exposure Actually Does to a Deck
Before talking about materials or process, it's worth being specific about what's actually working against a deck on this peninsula, because the failures we see out here aren't random — they're predictable, and they're preventable if you plan for them up front.
Salt Air and Metal Fasteners
Airborne salt accelerates corrosion on anything metal — screws, joist hangers, bolts, post bases. On a standard-spec deck built with generic coated fasteners, that corrosion often starts inside the wood, at the fastener, long before it's visible on the surface. By the time rust streaking shows up around a screw head, the fastener has usually already lost a meaningful chunk of its holding strength. This is the single biggest difference between building a deck here and building one somewhere without direct water exposure.
Driving Rain and Wind-Driven Moisture
Whatcom County gets plenty of rain generally, but rain that comes in nearly horizontal off open water behaves differently than a straight-down shower. It gets pushed up under rail caps, into end grain on exposed board cuts, and behind ledger boards where the deck meets the house. Any gap or seam that would be a non-issue in a sheltered yard becomes a chronic moisture entry point on an exposed lot here.
Moss, Shade, and Standing Moisture
Between tree cover and the long stretch of grey, damp weather this area gets, moss and algae find a foothold on deck surfaces that stay shaded or don't drain well. Moss isn't just cosmetic — it holds moisture against the decking surface, which is exactly the condition that breaks down wood fiber and, on lower-grade composites, can contribute to surface degradation over time.
Choosing the Right Decking Material for This Site
There's no single "best" decking material for every lot — the right call depends on sun exposure, how close the deck sits to open water, and how much upkeep the homeowner actually wants to do. What we won't do is default to whatever's cheapest without walking through the trade-offs first.
| Material | How It Handles This Climate | Maintenance | Rough Lifespan |
|---|---|---|---|
| Pressure-treated fir/hem-fir | Needs sealing more often near open water; end grain and cut edges are vulnerable if not re-sealed | Annual cleaning, re-sealing every 1-2 years | 15-20 years with upkeep |
| Cedar | Naturally rot- and insect-resistant, but salt air and driving rain will grey and dry it out faster without regular oiling | Oil or stain every 1-2 years | 20-25 years with consistent care |
| Composite (capped) | Holds up well to moisture and salt exposure; doesn't absorb water like wood, but still needs cleaning where moss gets a foothold | Periodic washing, no sealing/staining | 25-30+ years |
| PVC decking | Best moisture and salt resistance of the common options; won't rot or absorb water | Occasional washing | 30+ years |
For decks that sit close to the water or get direct wind exposure, we lean homeowners toward capped composite or PVC unless there's a strong aesthetic reason to go with wood. For sheltered, tree-covered lots where moss is the bigger concern than salt spray, a well-maintained cedar deck can still be the right call — it just needs a homeowner willing to stay on top of the oiling schedule.
Framing and Fasteners: Where Decks Actually Fail First
Homeowners tend to focus on the decking surface because it's what they see and walk on, but the framing underneath is where problems start on an exposed site like Point Roberts. A deck can look fine on top while the structure underneath is losing integrity.
- Ledger flashing: The board that attaches the deck to the house needs proper flashing so wind-driven rain can't work its way behind it and into the house framing.
- Corrosion-resistant hardware: Stainless or high-grade coated fasteners and joist hangers rated for coastal/exposed use, not the standard hardware used on a sheltered inland deck.
- Post base drainage: Posts set so water can't pool at the base, where it will sit against end grain and hardware and do the most damage over time.
- Joist spacing and blocking: Correct spacing matters more with composite and PVC decking, which have their own manufacturer span requirements that differ from solid wood.
Cutting corners on any of these is invisible on day one and expensive five to ten years later, when the fix means tearing up decking to get at framing that's already failing.
Design Considerations Specific to Point Roberts Properties
Wind and Orientation
Many lots here have real exposure to open water and prevailing wind. Railing design, board orientation, and even the layout of stairs and landings can be adjusted to reduce how much wind-driven rain the deck surface actually catches, which matters for both comfort and long-term wear.
Grading and Drainage Underneath
A deck that sits low to the ground, or over soil that doesn't drain well, traps moisture underneath where it's out of sight. On a site with this much annual rainfall, we look at grading and ventilation under the deck as part of the design, not as an afterthought.
Rail and Guard Requirements
Any deck with a walking surface more than 30 inches above grade needs code-compliant guardrails, and elevated waterfront lots often have taller decks than a typical inland yard. We build to current Washington building code requirements for guard height and baluster spacing as a matter of course.
Our Process for a Point Roberts Deck Project
Point Roberts is a bit different from a job in Custer or elsewhere in Whatcom County simply because of where it sits — it's only reachable by driving through Canada or by water. That changes how a job gets planned, even if it doesn't change how the deck gets built.
- On-site assessment: We walk the lot, check sun and wind exposure, look at grading and how close the build site is to open water, and talk through what the homeowner actually wants to use the space for.
- Material selection: Based on exposure and budget, we walk through the real trade-offs between wood, composite, and PVC rather than pushing one default option.
- Permitting: Point Roberts is unincorporated Whatcom County, so deck permits go through the county, same as the rest of our service area — we handle that submission and coordination.
- Logistics and scheduling: Because every crossing takes time, we plan material delivery and crew scheduling to minimize trips back and forth, so the job moves efficiently once it starts.
- Build and inspection: Framing, flashing, decking, and rail installation, followed by whatever county inspection is required for the scope of work.
Keeping a Coastal Deck in Good Shape
A well-built deck out here still needs a homeowner to do a little bit of upkeep — the difference is that with the right materials and framing, that upkeep is minor rather than a constant battle.
- Sweep or rinse off standing debris and moss growth regularly, especially in shaded areas
- Check and clear gaps between boards so water and debris don't build up
- Inspect ledger flashing and rail connections once a year for any sign of water intrusion
- Re-oil or re-seal wood decking on the schedule the material actually needs, not just when it looks dry
- Look underneath the deck occasionally for standing water or poor drainage after heavy rain
- Address any loose or corroding hardware right away rather than waiting for a bigger repair
Why Local Experience on This Peninsula Matters
A crew that hasn't built on Point Roberts before is working from a generic spec sheet. A crew that already knows the site conditions out here — the salt exposure, the wind patterns, the moss issues that show up on shaded lots, and the logistics of getting materials and crews across the border efficiently — builds a deck that's sized to the actual conditions instead of a textbook average. That shows up later as a deck that still looks and performs well after a decade of Whatcom County winters, rather than one that needs early repairs because the fasteners or flashing weren't chosen for this exposure in the first place.
If you're planning a new deck or replacing one that's showing its age, we're happy to walk the site with you and put together a straightforward estimate — no pressure, no hard sell, just an honest look at what your lot needs. Use the form below to get started.