Ferndale Siding Bellingham's Climate Is Hard on Exterior Siding
Homes in Bellingham sit close enough to the water and the foothills to catch the worst of both worlds: salt-tinged air rolling in off Bellingham Bay and the Strait, and long stretches of driving rain that Whatcom County is known for. Add in the region's mild, damp winters and shaded lots under conifers, and you get a near year-round moss season that coats north-facing walls, trim, and rooflines. That combination wears down exterior materials faster than homeowners expect, especially on siding that wasn't built with coastal Pacific Northwest weather in mind.
Ferndale Siding Company works throughout Whatcom County, and Bellingham is one of the areas where we see this weathering pattern most consistently. Salt air accelerates corrosion on fasteners and hardware. Wind-driven rain finds its way into seams, laps, and butt joints that weren't sealed or flashed correctly. And moss doesn't just look bad — it holds moisture against the siding surface, which is exactly the condition that causes rot, delamination, and paint failure over time.
Why We Only Install James Hardie Fiber Cement
We've made a deliberate decision to install one siding system: James Hardie fiber cement. We don't install vinyl, LP SmartSide, Cemplank, Allura, primed spruce, or cedar. That's not a marketing angle — it's a standard we hold ourselves to because of what we see when we tear old siding off Bellingham homes.
Wood-based and engineered wood products, no matter how well treated, remain organic material at their core. In a climate with this much sustained moisture and moss growth, that means an ongoing maintenance burden: recoating, caulking, and watching for soft spots, especially at ground contact and roof lines where moss and water linger longest. Vinyl handles moisture fine on its own, but it moves with temperature swings, can crack in age, and doesn't offer the same fire resistance or factory-finish durability homeowners often want for a long-term investment.
James Hardie fiber cement is non-combustible, dimensionally stable, and built specifically for wet climates — the HZ5 product line is engineered for exactly the freeze-thaw and moisture cycling this region sees. The factory-applied ColorPlus finish resists fading and chipping far better than field-applied paint, which matters when your siding is going to be exposed to sideways rain for months at a time. It also carries a strong, transferable warranty, which adds real value if you ever sell the home.
What Our Work in Bellingham Looks Like
We handle siding, roofing, windows, and decks, and on most exterior projects those systems overlap — flashing details at rooflines affect how siding performs, window integration affects water management, and deck ledger connections need the same careful moisture detailing as any wall assembly. Treating the whole exterior as one system, rather than a list of separate trades, is part of how we keep water out of Bellingham homes long-term.
- Siding replacement and repair — full Hardie plank, shingle, or panel installations, plus spot repairs where moisture or moss damage has already set in
- Roofing — replacement and repair work that protects the transitions where roof and wall meet, a common failure point in wind-driven rain
- Windows — replacement with proper flashing integration into the siding system, not just a swap of the sash
- Decks — built and detailed to shed water away from the structure and the home's siding
Why a Local Crew Matters Here
Bellingham's microclimates vary block to block — shaded, tree-covered lots hold moisture and grow moss differently than open, wind-exposed sites closer to the water. A crew that works across Whatcom County regularly sees both conditions and installs accordingly: proper rainscreen gaps, correct fastener spacing and type, and flashing details sized for the amount of wind-driven rain a given site actually receives. Correct installation is what makes any siding material perform — even the best product fails early if it's hung wrong for the site's exposure.
If your Bellingham home has moss buildup, soft or discolored siding, or you're just planning ahead for a replacement, we're happy to take a look. Reach out for a free, no-pressure estimate — we'll walk the exterior with you, point out what we see, and give you an honest read on your options.