Anacortes Siding Guemes Island sits just across the channel from Anacortes, but it lives by its own rules. There's no bridge, most projects mean a ferry reservation, and the building stock ranges from older cabins upgraded over the decades to newer waterfront and view homes built for the setting rather than for easy maintenance. Any contractor working out there needs to plan differently than they would for a job a few blocks from the shop in town. We're based in Anacortes, we run material and equipment across on the Guemes Channel ferry regularly, and we build our schedule around the boat rather than treating the island as an afterthought.
What Guemes Island's Climate Does to Siding
The island gets the same marine air that defines this part of Skagit County, but concentrated. Homes closer to the water take direct salt spray off the channel and the open water beyond it, which accelerates corrosion on fasteners, flashing, and any metal trim that isn't rated for a marine environment. Inland and wooded lots deal with a different problem: heavy tree cover keeps siding shaded and damp for long stretches of the fall and winter, which is exactly the environment moss and algae need to take hold.
Driving rain off Rosario Strait and the Salish Sea comes in sideways more often than it comes in straight down, which means water finds its way behind poorly lapped siding, undersized trim gaps, and old caulk joints that have given up. And because so many Guemes properties are second homes or weekend places, siding problems often go unnoticed for months between visits — a small leak in January can be a rotten sheathing repair by summer if nobody's around to catch it early.
The Three Things We See Most Often
- Moss and algae staining on north-facing and tree-shaded walls, worse on wood and engineered wood products than on fiber cement
- Corroded or streaking fasteners and trim on homes with direct water exposure
- Water intrusion at old caulk joints, window returns, and butt seams that were never designed to handle this much sustained moisture
Why We Only Install James Hardie Fiber Cement
We stopped installing vinyl, LP SmartSide, primed wood, and cedar lap siding years ago, and an island climate like Guemes is exactly why. Fiber cement doesn't rot, it doesn't feed moss the way wood fiber products can, and it's not affected by the freeze-thaw and moisture cycling that causes vinyl to warp or crack over time. James Hardie's HZ10 product line is specifically engineered for wet, marine, high-humidity climates like ours — it's not a generic siding with a marketing label, it's a formulation built for this weather.
That doesn't mean other products are junk. Vinyl is inexpensive and low-maintenance in the right climate. Engineered wood siding can look great and install quickly. Cedar has genuine character that some homeowners want no matter the upkeep. But on a property with salt air, heavy shade, and long stretches without anyone checking on it, those trade-offs stack up fast: vinyl can crack and fade under sun and salt exposure, engineered wood needs consistent field-applied sealing at every cut edge or it's vulnerable to moisture, and cedar needs a maintenance schedule most part-time island homeowners can't keep up with. We'd rather install one product correctly than install several products with caveats attached.
What James Hardie Gets Right for This Environment
| Concern | How Hardie Fiber Cement Addresses It |
|---|---|
| Moisture and rot | Cement-based composition doesn't absorb water the way wood-based products can |
| Moss and algae | Factory-applied ColorPlus finish resists staining better than raw or site-painted surfaces |
| Salt air exposure | Non-combustible, dimensionally stable material that isn't degraded by airborne salt the way some metals and coatings are |
| Fire exposure | Non-combustible material, a genuine advantage during regional wildfire smoke and ember seasons |
| Long ownership gaps | Lower-maintenance finish means fewer surprises for owners who aren't on-site year-round |
Why a Local Crew Matters Out Here
Working on Guemes Island isn't the same as working in Anacortes proper. Ferry schedules dictate when crews and materials can arrive and leave, so a job that would take three consecutive days in town might need to be planned around specific sailing windows to avoid burning half a day waiting on a boat. Material deliveries need to be staged and loaded correctly the first time — there's no quick run back to the supply yard if someone forgot a box of trim or the wrong fastener length. A crew that hasn't done this before will lose time and money figuring that out on your job.
We also know what island power and water access typically look like on a project — some properties are on generators or have limited on-site power, others have well water and septic systems that need to be respected during excavation or staging near the foundation. None of that is exotic, but it does mean a contractor who treats every job like a standard mainland install will hit friction that a locally experienced crew won't.
How We Approach a Guemes Island Siding Project
Assessment and Estimate
We start with an on-site look at the existing siding, the exposure the home actually gets (open water versus tree-sheltered, prevailing wind direction, roof overhang depth), and the condition of the sheathing and flashing underneath. Homes with visible moss staining or soft spots near grade often have more going on behind the siding than what's visible on the surface, so we account for that in the estimate rather than surprising you with it mid-project.
Planning Around the Ferry
Once a project is scoped, we plan the material drop and crew schedule around the ferry sailing times so the job runs efficiently instead of in fragmented half-days. For larger jobs, that usually means getting the bulk of material over in one or two trips rather than piecemeal.
Installation to Manufacturer Spec
James Hardie's warranty coverage depends on correct installation — proper clearances above grade and roofing, correct fastener patterns, and proper flashing and water management at every penetration and joint. We install to that spec because it's the difference between a wall system that handles decades of Guemes weather and one that fails in the exact spots this climate likes to attack.
Coordinating Other Exterior Work
Because we also handle roofing, windows, and decks, a siding project is a good time to address related issues at once — a roof edge that's been dumping water onto the top course of siding, a window that's no longer sealing correctly, or a deck ledger connection that needs attention before new siding goes around it. Bundling that work into one mobilization is especially valuable on the island, where every extra trip costs more time than it would in town.
Cost Factors Specific to This Area
| Factor | Why It Matters on Guemes Island |
|---|---|
| Ferry logistics | Material and crew transport needs scheduling around sailing times, which affects project timeline more than cost directly |
| Access and staging | Some lots have limited driveway or staging space, which can affect delivery and scaffolding approach |
| Existing damage | Homes with long-term moss or moisture exposure sometimes need sheathing or trim repair discovered once old siding comes off |
| Exposure category | Waterfront-facing walls may warrant upgraded fastener and flashing details compared to sheltered walls |
| Home size and complexity | Cut-up walls with lots of corners, windows, and transitions take longer to trim out correctly than simple rectangular walls |
A Simple Checklist Before You Replace Siding on Guemes Island
- Note which walls take direct wind and rain versus which are tree-sheltered — they may need different attention
- Check for moss or algae staining, especially on north- and east-facing walls
- Look for soft or discolored siding near ground level and around window sills
- Ask any contractor how they handle ferry logistics and material staging for the job
- Confirm what siding product is being proposed and ask directly how it performs in a marine, high-moisture environment
- Ask whether roofing, window, or deck issues should be addressed in the same mobilization
What to Expect From Us
We install James Hardie fiber cement siding exclusively, and we back that installation with attention to the flashing and water management details that matter most in a climate like this. We're not going to sell you on vinyl because it's cheaper up front, or on cedar because it looks rustic — we'll tell you honestly what we think will hold up on your specific property, given its exposure and how often it gets looked after, and why fiber cement is almost always our answer for homes out here.
If you're weighing a siding project on Guemes Island, we're happy to come take a look, walk the exposure with you, and put together a straightforward estimate — no pressure, no obligation. Use the form below to get started.