Skagit County Cemplank Comes Up a Lot, So Let's Talk About It Honestly
If you've gotten more than one siding quote in Skagit County, there's a good chance one of them included Cemplank. It's a fiber cement product, sold through building supply distributors, and it's priced to win bids. We get asked about it often enough that we think homeowners deserve a straight answer instead of a sales pitch: we don't install it. Not because it's a scam or because someone had a bad experience with it, but because after years of installing fiber cement siding on homes from Mount Vernon to Anacortes to the Sedro-Woolley foothills, we've settled on one product line — James Hardie — and we think you should know why before you sign a contract with anyone.
This isn't a takedown. Cemplank is real fiber cement, made by a legitimate manufacturer, and it will outperform vinyl or untreated wood on plenty of homes. But "real fiber cement" and "the right fiber cement for a house that sits fifteen miles from saltwater and gets rained on nine months a year" are two different questions.
What Cemplank Actually Gets Right
Fiber cement as a category is a good idea. It's a mix of cement, sand, and cellulose fiber, and compared to wood or vinyl it holds up better against fire, insects, rot, and impact. Cemplank is manufactured to standard fiber cement specs, and on paper its planks, panels, and trim look a lot like what you'd get from any other fiber cement brand. It's also usually the cheaper bid, which matters to a lot of families budgeting a siding project.
If a homeowner in a mild, dry climate installed Cemplank correctly and maintained it, there's no reason to assume catastrophe. We're not here to tell you the product is junk. We're here to tell you why we, specifically, as a contractor working exclusively in this county's weather, don't put our name on it.
Why Skagit County's Climate Changes the Math
Skagit County isn't a generic Pacific Northwest climate — it's a specific combination that's hard on siding in three ways at once.
Salt Air
Homes anywhere near Padilla Bay, Similk Bay, or the Anacortes shoreline deal with airborne salt that accelerates corrosion on fasteners, flashing, and any exposed metal trim. Siding systems and the fasteners that hold them need to be matched for that environment, and not every manufacturer's installation guidance is written with brackish coastal air in mind.
Driving Rain
This isn't gentle Seattle drizzle. Storms moving up the Sound and across Fidalgo Island bring wind-driven rain that hits siding sideways, not just from above. That means every seam, joint, and butt gap is a potential water entry point, and the quality of the caulking, flashing, and factory finish matters more here than in a climate where siding mostly just gets rained on straight down.
Moss Season
Our long wet season, shaded lots, and mild temperatures are basically a moss incubator. Anything on a house that holds moisture — a rough-sawn texture, a hairline crack, an under-caulked seam — becomes a spot where moss and mildew take hold. Once organic growth gets a foothold on siding, it holds even more moisture against the substrate, which becomes a slow, self-feeding problem.
None of this means Cemplank physically can't survive here. It means the margin for error — in the factory finish, in the installation detailing, in the warranty backing you up if something goes wrong — gets a lot thinner in this climate than in a drier one.
Where the Real Differences Show Up
| Factor | Cemplank | James Hardie (HZ5 / HardieZone) |
|---|---|---|
| Climate engineering | General-purpose fiber cement formulation | Formulated specifically for Pacific Northwest moisture and freeze-thaw cycling |
| Factory finish | Factory-primed or painted options vary by distributor stock | ColorPlus baked-on finish designed to resist fading and hold up without repainting for years |
| Availability of matching trim/accessories | Inconsistent regionally; matching batches can be a challenge on repairs | Full matched trim, soffit, and accessory system, widely stocked in this region |
| Warranty | Manufacturer-backed, terms vary | Long, transferable limited warranty with a track record of being honored |
| Installer familiarity in this region | Less common here, fewer local installers deeply experienced with it | Widely installed in Western Washington; well-understood best practices for our weather |
Installation Sensitivity Is the Part Nobody Talks About
Fiber cement siding is only as good as its installation. Every brand's manufacturer spells out fastener spacing, gapping at butt joints, flashing details, and caulking requirements — and every brand's warranty can be affected if those instructions aren't followed. The issue with Cemplank isn't the material chemistry, it's practical: because it's less common in our area than Hardie, fewer local crews have run thousands of feet of it in this specific climate, learned where it wants extra attention, and built up the muscle memory for detailing it correctly against driving rain and salt air.
We install James Hardie almost exclusively, on hundreds of linear feet of siding every year, in this exact climate. That repetition matters. We know where water wants to get in on a Skagit Valley house, and we know how Hardie's HZ5 product line is engineered to handle it. We'd rather be excellent at one system than adequate at several.
Warranty Is Worth a Closer Look
A warranty is only as good as the company standing behind it and the clarity of its terms. Before choosing any siding product, ask to see the actual warranty document — not a sales summary — for both material defects and finish (paint/color) performance. Ask specifically:
- Is the warranty transferable if you sell the house?
- Does it cover the factory finish separately from the substrate itself?
- What voids it — specific installation errors, lack of maintenance, or anything else?
- How long has the manufacturer been standing behind claims in the Pacific Northwest specifically?
- Is the warranty prorated, meaning it pays out less the older your siding gets?
James Hardie's warranty structure is a big part of why we standardized on it — it's long, it's transferable, and it has a real track record of being honored, which matters more to us than shaving a few dollars per square foot off a bid.
What We Install Instead, and Why
We install James Hardie fiber cement exclusively — no LP SmartSide, no vinyl, no Cemplank, no Allura, no primed spruce or cedar. It's a deliberate, narrow standard, not a lack of options. Hardie's HZ5 product line is climate-engineered for our region, the ColorPlus factory finish is baked on rather than field-painted, the material is non-combustible, and the warranty is transferable and well-established. When we detail flashing, fastener spacing, and joint gapping on a house near the water in Anacortes or up in the hills outside Sedro-Woolley, we're doing it against a manufacturer's spec we've installed thousands of times in exactly this weather. That consistency is what lets us stand behind the work.
Questions to Ask Before You Choose a Fiber Cement Product
- Is this product specifically engineered for Pacific Northwest moisture and climate, or is it a general-purpose formulation?
- How many local installers have significant experience with this exact brand, in this exact climate?
- Can I see the full written warranty, not just a summary?
- Is the finish factory-applied or field-painted, and what does that mean for touch-ups down the road?
- How readily available is matching trim and replacement product if I need a repair in five or ten years?
- What does the manufacturer's own installation guide say about fastening near saltwater or in high-wind-driven-rain zones?
Any honest contractor should be able to answer these clearly, for whatever product they're proposing. If they can't, that's worth noticing.
Our Bottom Line
We're not going to tell you Cemplank is a bad product — it's a legitimate fiber cement option, and in a different climate, installed by a crew that runs it every day, it can hold up fine. But we don't work in a different climate. We work in Skagit County, with salt air off the Sound, driving rain off the water, and a moss season that tests every seam and joint on a house. For that environment, we've chosen to install one product, install it exceptionally well, and stand behind it with a warranty that has a real track record — and that product is James Hardie.
If you're weighing siding options for your home, we're happy to walk the property with you, look at your exposure and current siding condition, and give you a straightforward, no-pressure estimate — including an honest answer about whether Hardie makes sense for your specific situation.