Ferndale Siding Two Engineered Sidings, Two Different Materials
If you're researching siding for a home in Ferndale or elsewhere in Whatcom County, you've probably run into both James Hardie fiber cement and LP SmartSide in your search. Both are legitimate step-ups from vinyl. Both are marketed as engineered, low-maintenance products backed by real manufacturer warranties. But they are built from fundamentally different materials, and that difference matters more here than in a lot of the country. This page walks through how they compare and explains why our crews install James Hardie exclusively.
What Each Product Actually Is
James Hardie siding is fiber cement — a mix of Portland cement, sand, and cellulose fiber, cured and then finished at the factory with a baked-on ColorPlus coating. It's an inorganic product. There's no wood in it to feed rot, insects, or fungal growth.
LP SmartSide is an engineered wood product — strand-based or panel wood substrate, treated and coated with a resin-saturated overlay to resist moisture. It's a real improvement over old-school untreated wood siding, and LP has put serious engineering into the treatment process. But at its core, it's still wood. Wood swells, wood absorbs moisture at cut edges and fastener penetrations, and wood is a food source if that moisture gets in and stays in.
Side-by-Side Basics
| Factor | James Hardie (fiber cement) | LP SmartSide (engineered wood) |
|---|---|---|
| Base material | Cement, sand, cellulose fiber | Wood strand/panel substrate |
| Combustibility | Non-combustible | Combustible (wood-based) |
| Moisture response | Does not swell or rot | Resin-treated to resist, but wood swells if breached |
| Finish | Factory-baked ColorPlus, up to 30-yr finish warranty | Field-primed or pre-finished, repaint on a shorter cycle |
| Typical lifespan claims | Manufacturer engineering for 30+ years in the field | Manufacturer 5/50-year limited warranty structure |
Why Moisture Behavior Is the Deciding Factor Here
Ferndale sits close enough to the Strait of Georgia and Bellingham Bay that salt air is part of daily life on the siding, not an occasional event. Add driving rain off the water, wind-blown moisture that gets forced under laps and around trim, and a moss season that can run most of the fall through spring under the region's persistent cloud cover and dampness — and you've got a climate that tests any siding's moisture management for most of the year.
LP SmartSide's resin treatment does a genuinely good job resisting surface moisture. The vulnerability shows up at the details: cut ends, fastener heads, and butt joints, where the treated coating is broken and untreated wood substrate is exposed. If those cuts aren't field-sealed correctly and consistently — every time, on every piece, by every installer — that's where moisture gets a foothold. Once wood substrate starts absorbing water repeatedly, especially in a climate that doesn't give it long dry stretches to fully release that moisture, swelling, checking, and eventually rot become a maintenance issue rather than a hypothetical one.
Fiber cement doesn't have that failure mode. It can get wet and dry out without swelling, without a food source for rot fungus, and without the fastener-and-cut-edge vulnerability that engineered wood products carry by nature of being wood.
Installation Sensitivity
Neither product is a "set it and forget it" install. Hardie has a published fastening, clearance, and caulking spec, and installing it outside that spec is the single biggest cause of Hardie call-backs in the industry — that's true and worth saying plainly. LP SmartSide has a similar spec, but the stakes for cut-edge sealing are higher, because a missed or degraded seal on wood substrate has a more direct path to moisture damage than a missed detail on fiber cement. Both products reward a crew that follows the manufacturer's install guide to the letter. We only do that kind of install, which is one reason we limit ourselves to one product system we know thoroughly rather than splitting attention across several.
Fire Consideration
James Hardie fiber cement is non-combustible. LP SmartSide, as a wood-based product, is not. For most homeowners this isn't the deciding factor, but it's worth knowing, particularly for anyone weighing insurance considerations or wildfire-adjacent risk in drier stretches of a Pacific Northwest summer.
Why We Standardized on James Hardie
We install only James Hardie. It isn't that LP SmartSide is a bad product — LP has invested real engineering into making wood-based siding perform better than it used to. But given what Whatcom County weather does to a house over 20-plus years — the salt air, the driving rain, the long stretches of damp and moss — we'd rather stand behind a material that doesn't rely on an unbroken coating to keep wood dry. Fiber cement's non-combustible, non-organic composition, combined with Hardie's factory-baked ColorPlus finish and its climate-engineered HZ5 product line built for exactly this kind of Pacific Northwest exposure, is what we're comfortable putting our name behind and backing with a strong transferable warranty.
If you're weighing siding options for a Ferndale home, we're happy to walk your property, talk through what your specific exposure looks like, and give you a straightforward, no-pressure estimate — no obligation, just an honest look at what your house needs.