Mount Vernon Blanchard's Setting Is Beautiful — and Hard on Siding
Blanchard sits along the Chuckanut Drive corridor in northern Skagit County, close to Samish Bay and tucked against wooded hillsides. It's one of the prettiest stretches of siding work we do — and one of the toughest on exterior materials. Properties here combine three things that don't play well with a poorly built wall system: proximity to saltwater, heavy tree cover that keeps siding shaded and damp, and the driving rain that rolls in off the water during fall and winter storms.
None of that means siding fails here. It means siding has to be chosen and installed with those conditions in mind from the start. A product and installation method that works fine in a dry inland subdivision can underperform on a shaded, water-facing lot in Blanchard. This page covers what that means in practice — for the material, the install details, and the maintenance that follows.
What Blanchard Homes Are Actually Up Against
Salt Air and Corrosion
Homes closer to Samish Bay get airborne salt on a regular basis. Salt air accelerates corrosion of fasteners, trim flashing, and any metal component in the wall assembly. It also settles into siding surfaces, and over years that can dull or degrade a finish that wasn't built to handle it. This isn't a Blanchard-only issue — it's common to Skagit County's coastal edge — but it's more pronounced here than it is a few miles inland.
Driving Rain and Wind
Storms coming off the water don't just drop rain straight down — wind pushes it sideways into wall assemblies, siding laps, and trim joints. Wind-driven rain finds every gap, undersized overlap, or missed flashing detail a lazy installation leaves behind. On an exposed or elevated Blanchard lot, this is one of the biggest factors in whether a siding job holds up or starts showing water intrusion within a few winters.
Shade, Moss, and a Long Wet Season
Wooded lots are common in and around Blanchard, and tree cover means siding on the north and shaded sides of a house can stay damp for days after a storm. Combine that with Western Washington's long wet season — often October through May — and you get ideal conditions for moss, algae, and mildew to take hold on any surface that holds moisture or has a rough, absorbent texture. This is less about any one product failing and more about the reality of the climate: whatever goes on the wall needs to shed water fast and resist organic growth, because it's going to be tested for months at a time every year.
What a Correct Installation Actually Involves
Good siding starts underneath the siding, not with it. The visible panels get all the attention, but the water management system behind them is what actually determines whether a Blanchard home stays dry. A correct installation includes:
- A continuous weather-resistive barrier (WRB) installed shingle-style so water sheds down and out, not into the wall
- Properly lapped and sealed flashing at every window, door, roofline, and penetration
- A drainage plane or rainscreen gap that lets bulk water and moisture vapor escape instead of sitting against the sheathing
- Correct fastener type, spacing, and embedment — fiber cement is unforgiving of shortcuts here
- Proper clearance from grade, decks, and roof surfaces so siding never sits in standing water or constant splash-back
- Factory-finished panels with sealed, painted cut edges — raw cut edges are where moisture gets in first
Skip any one of these and the siding itself almost doesn't matter — water will find its way in regardless of what brand is on the outside. This is where a lot of installation problems actually originate, and it's invisible once the job is buttoned up, which is exactly why it has to be done right the first time.
| Detail | Done Correctly | Common Shortcut |
|---|---|---|
| Weather barrier | Continuous, lapped shingle-style, taped seams | Gaps, reverse laps, or stapled-only seams |
| Flashing | Integrated with WRB at every opening | Caulk used in place of real flashing |
| Fasteners | Corrosion-resistant, correct spacing and depth | Standard fasteners, overdriven or too sparse |
| Cut edges | Field-sealed with manufacturer-approved product | Left raw or unsealed |
| Ground clearance | Minimum clearance maintained per manufacturer spec | Siding installed tight to grade or hardscape |
Why We Only Install James Hardie Fiber Cement
We standardized on James Hardie fiber cement siding and don't install vinyl, LP SmartSide, Cemplank, Allura, or raw wood siding like primed spruce or cedar. That's a deliberate call, not a brand preference, and it matters more in a place like Blanchard than in drier parts of the state.
Fiber cement is non-combustible, which matters for wildfire-adjacent wooded properties. It doesn't absorb water the way engineered wood products can, which matters when siding stays damp for extended stretches under tree cover. And Hardie's ColorPlus finish is factory-baked onto the panel under controlled conditions — a more consistent, better-adhered finish than field-applied paint, which holds up better against the fading and wear that salt air and UV exposure cause over time.
James Hardie also builds specific product lines engineered for different climate zones (their HZ system), and the Pacific Northwest falls under a moisture-focused engineering profile. Combined with a strong transferable warranty, that's the combination we're willing to stand behind on a Blanchard home — and it's the reason we turn down other products even when a homeowner asks for them by name. If you want the longer version of that reasoning, we've written it up in more detail elsewhere on this site.
Our Process on a Blanchard Job
- On-site assessment — we walk the property, checking sun exposure, tree cover, drainage patterns, and existing siding condition before recommending anything.
- Tear-off and sheathing check — old siding comes off and we inspect the sheathing underneath for rot or existing moisture damage before it gets covered back up.
- Weather barrier and flashing — the WRB, flashing, and any drainage plane go in correctly before a single piece of siding is hung.
- Hardie installation — panels installed to manufacturer specification for fastening, spacing, and clearance, with cut edges sealed as we go.
- Trim, caulking, and detail work — the finish details that determine how the job looks and performs for the next several decades.
- Final walkthrough — we go over the finished job with you before calling it done.
What Affects Cost on a Blanchard Project
Every home is different, but the same handful of factors drive most of the cost variation we see on siding jobs in this area:
| Factor | Why It Matters |
|---|---|
| Existing siding removal | Tear-off, disposal, and any rot repair found underneath add labor and material |
| Wall complexity | Multiple stories, dormers, and cut-up rooflines mean more flashing detail and labor |
| Access and site conditions | Wooded, sloped, or tight-access lots — common in Blanchard — affect staging and scaffolding |
| Siding profile and color | Lap width, shingle-style accents, and custom ColorPlus finishes vary in material cost |
| Trim and detail scope | Corner boards, window trim, and fascia work add up beyond the flat wall area |
We give straightforward, written estimates rather than a vague per-square-foot number, because the site conditions above genuinely change the scope of the job.
Keeping Siding Looking Good After Installation
Fiber cement with a factory finish needs far less upkeep than raw wood or a field-painted product, but no siding is maintenance-free in a climate this wet. A little seasonal attention goes a long way:
- Rinse siding annually, focusing on shaded, north-facing, and tree-covered walls where moss and algae take hold first
- Keep gutters clear so overflow doesn't run down and saturate wall sections repeatedly
- Trim back vegetation and tree branches that keep siding shaded and damp longer than necessary
- Check and refresh caulking at trim joints and penetrations every few years
- Address any small chips or scratches promptly with a manufacturer-matched touch-up product to prevent moisture entry at bare spots
Why Local Experience Matters for This Job
A crew that already works Blanchard and the surrounding Skagit County coastline knows which walls on a given lot orientation take the worst of the wind-driven rain, which properties need extra attention to drainage because of tree cover, and how the local permitting and inspection process actually runs. That's the kind of judgment that doesn't come from a spec sheet — it comes from having done the work on homes with the same exposure, the same moss pressure, and the same salt air a few miles from yours.
If your siding is showing moss buildup, soft spots, or visible wear, or you're planning ahead for a replacement, we're happy to take a look and walk you through what your home actually needs. Reach out for a free, no-pressure estimate using the form below.