Anacortes Siding March Point's Exposure: What the Climate Does to Siding
March Point sits out on the water, which is part of what makes it a desirable place to live and part of what makes it hard on exterior building materials. Homes here take on a steady diet of marine air, wind-driven rain, and long stretches of overcast, damp weather that never quite gives siding a chance to dry out completely between storms. Add in the shade from mature evergreens that many properties in this part of Skagit County have, and you get the ingredients for moss, algae, and slow moisture intrusion working on a house year-round, not just during the wettest months.
Salt-laden air is the piece that's easy to overlook. It doesn't just affect boats and metal railings — it accelerates the breakdown of paint film, softens caulk joints faster than inland homes experience, and finds its way into any gap in the water-resistive barrier behind the siding. Over a decade or two, a siding system that wasn't built for this exposure starts to show it: cupping, delamination, soft spots at the bottom courses, and paint that needs recoating far sooner than the label promised.
Why Fiber Cement Is the Right Material Here
Where Wood, Vinyl, and Engineered Wood Fall Short
Solid wood and primed spruce siding absorb moisture at cut ends and fastener holes, and in a climate that rarely gets a long dry spell, that moisture doesn't fully leave before the next rain arrives. Vinyl doesn't rot, but it expands and contracts with temperature swings, can warp or crack in wind-driven weather, and offers no real fire resistance — a real consideration this close to dry brush and wooded lots in the summer months. Engineered wood products (OSB-based siding like LP SmartSide) hold up reasonably well when installation is flawless, but any breach in the factory coating — a missed caulk line, a scratch during handling, a fastener driven at the wrong angle — gives moisture a path into the substrate, and OSB doesn't forgive that the way solid material does.
Why We Install Only James Hardie
We standardized on James Hardie fiber cement because it's a cement-and-cellulose composite, not an organic wood product — it doesn't feed moss the way wood-based sidings do, it doesn't ignite, and it doesn't swell or rot at cut edges the way wood or OSB siding can. The ColorPlus factory finish is baked on and warranted for both fade and adhesion, which matters directly in a salt-air environment where field-applied paint tends to fail early. It's not the cheapest siding on the market, and it's heavier and less forgiving to install than vinyl, but it's the product we're willing to stand behind for a house that has to survive Anacortes weather for 30-plus years, not just look good on installation day.
What a Correct Fiber Cement Installation Involves
Moisture Management Behind the Siding
Fiber cement is only as good as what's behind it. A correct install starts with a continuous water-resistive barrier, properly lapped and taped at every seam, with flashing integrated at every window, door, deck ledger, and roof-to-wall transition — not just caulked over. We build in a rainscreen gap or drainage plane wherever conditions call for it, so any water that does get behind the cladding has somewhere to go instead of sitting against the sheathing. This step is invisible once the job is done, but it's the single biggest factor in whether a house stays dry for decades or develops hidden rot in five years.
Fastening and Joint Detailing
James Hardie publishes specific fastening patterns, clearances, and gapping requirements, and they exist for a reason — get them wrong and you void the warranty and create failure points. Butt joints need to be flashed or use a jointing system, not just butted and caulked. Fasteners need to land in framing at the correct depth, not overdriven (which crushes the board's edge) or underdriven (which leaves it loose to rattle and work moisture in over time). Bottom clearance above grade, decks, and roof lines has to meet minimum standards so splash-back and pooling water don't sit against the board.
Choosing the Right Hardie Line and Finish for March Point
James Hardie engineers its siding in regional formulations, and homes exposed to marine climates like this one benefit from that engineering rather than a one-size-fits-all product.
| Consideration | What It Means for a March Point Home |
|---|---|
| HZ5 vs. HZ10 formulation | HZ5 is engineered for freeze-prone, moisture-heavy climates like the Pacific Northwest; it's the baseline we spec here rather than a formulation built for hot, dry regions |
| Lap siding vs. panel vs. shingle profile | Lap siding is the most common fit for typical March Point home styles; panel and shingle profiles work well as accent siding on gables or entry features |
| ColorPlus vs. field-applied paint | ColorPlus holds its finish far longer under salt air and UV exposure than site-painted primed siding, which needs earlier recoating in this climate |
| Color and sheen selection | Darker colors show less algae staining short-term but absorb more heat and UV; lighter, low-sheen finishes tend to age more evenly here |
Our Process, From Estimate to Finished Siding
- Free on-site evaluation of your home's current siding, trim, flashing, and any moisture damage already present
- Honest recommendation on scope — full replacement, or in some cases a targeted repair, if that's genuinely the better call
- Written estimate with product line, color, and labor broken out, no vague allowances
- Removal of old siding with inspection of the sheathing underneath for hidden rot before anything new goes up
- Installation of the water-resistive barrier, flashing, and drainage detailing before a single piece of Hardie board is hung
- Fiber cement installation to manufacturer spec, followed by trim, caulking, and final cleanup
- Final walkthrough so you know exactly what was done and what maintenance, if any, it needs going forward
Living With Fiber Cement in a Moss-Prone, Salty Climate
Fiber cement is low-maintenance, not no-maintenance. A little seasonal attention goes a long way toward getting the full lifespan out of the material in this climate.
- Rinse siding annually with a garden hose to clear salt residue and loose debris before it builds up
- Keep gutters clear so overflow doesn't run down the face of the siding and feed moss growth
- Trim back trees and shrubs to maintain airflow and sunlight on shaded wall sections
- Check and recaulk joints around windows, doors, and trim every few years, since caulk fails well before the siding itself does
- Address any moss or algae staining early with a gentle wash rather than pressure-washing, which can damage the factory finish
- Walk the exterior after major windstorms to check for loose boards, damaged trim, or fastener pops
What Affects the Cost of a March Point Siding Job
| Factor | Why It Moves the Price |
|---|---|
| Home size and wall complexity | More corners, dormers, and roof-to-wall intersections mean more flashing and cutting labor |
| Condition of existing sheathing | Hidden rot found during tear-off adds repair cost but is far cheaper to fix now than to cover up |
| Siding profile and accent details | Mixing lap siding with shingle or panel accents adds material and labor over a single flat profile |
| Access and site conditions | Steep lots, limited driveway access, or extensive landscaping near the house can add setup time |
| Trim and color package | Custom trim profiles and premium ColorPlus color options carry a different price point than standard options |
We give straightforward, itemized estimates rather than a single lump number, so you can see exactly what's driving the cost before you commit to anything.
Why Hire a Crew That Already Works March Point
Siding detailing that works fine in a drier inland climate can fall short right on the water. A crew that regularly works this stretch of Skagit County already knows to build in extra drainage capacity, account for wind-driven rain angles at exposed corners, and choose fastening and flashing details that hold up to salt exposure — not because a manual told them to, but because they've seen what happens on nearby homes when those details get skipped. That local pattern recognition is hard to replace with a crew that only occasionally works this far out on the water.
If you're weighing a siding replacement or repair for a March Point home, we're happy to take a look and give you a straight answer — including telling you if a repair makes more sense than a full replacement. Reach out for a free, no-pressure estimate using the form below.