Birch Bay Siding If you're re-siding a home in Birch Bay, two products keep coming up in the conversation: James Hardie fiber cement and LP SmartSide engineered wood. Both are marketed as upgrades over vinyl, both come pre-primed or pre-finished, and both are installed by reputable contractors across Whatcom County. They are not the same material, though, and the difference matters more here than in a lot of places, because Birch Bay throws a specific combination of weather at a house: salt-laden air off the water, driving rain that hits siding sideways during winter storms, and a long stretch of the year where moss and mildew have every reason to take hold. This page walks through how the two products actually compare, so you can make an informed call — and explains why our crews only install James Hardie.
What James Hardie Fiber Cement Actually Is
James Hardie siding is made from a mix of Portland cement, sand, and cellulose fiber, cured under pressure into a dense, stable board. It has no wood content, which means it doesn't feed rot fungus and it doesn't expand and contract with moisture the way wood-based products do. Hardie makes climate-specific formulations — its HZ5 product line is engineered for the wetter, more humid regions of the country, which includes the Pacific Northwest. The boards come with a factory-applied ColorPlus finish baked on in a controlled environment, or as primed boards ready for field paint.
Why That Composition Matters Locally
Cement-based siding doesn't absorb moisture into its core the way wood fiber does. In a place like Birch Bay, where siding faces both salt spray and sustained wet weather much of the year, that's a meaningful advantage — the board isn't the thing that fails first.
What LP SmartSide Actually Is
LP SmartSide is an engineered wood product — strands of wood fiber bonded with resins under heat and pressure, then treated with a zinc borate preservative and coated with a resin-saturated overlay to resist moisture and insects. It's a real step up from untreated wood siding, and LP backs it with a documented manufacturing process and a warranty. It's lighter than fiber cement, which some crews find easier to handle, and it accepts fasteners without the pre-drilling or specialized blades that cement board requires.
The Trade-Off Built Into the Material
Because SmartSide is still a wood-fiber product at its core, its long-term durability depends heavily on the integrity of that engineered coating and treatment staying intact — at every cut edge, every fastener penetration, and every joint, for the life of the siding. Where that coating is compromised, the underlying wood fiber is exposed to exactly the kind of sustained moisture Birch Bay sees for months at a stretch.
Moisture and Climate Performance
This is the category that matters most for a Whatcom County home. Fiber cement doesn't rot, doesn't support fungal growth in its core, and holds up to repeated wet-dry cycling without losing structural integrity. Engineered wood, properly installed and maintained, resists moisture well for years — but "properly installed and maintained" is doing a lot of work in that sentence when you're dealing with driving rain off the bay and a moss season that can run from fall through spring.
Field-cut edges are the specific risk point with any wood-based product. Every time a board is trimming to fit — around windows, at corners, at the ends of a run — that cut exposes raw wood fiber unless it's field-sealed correctly and consistently, on every single cut, on every house. Fiber cement doesn't carry that same installation-sensitivity, because there's no organic material to protect once the board is cut.
Fire Performance
James Hardie fiber cement is non-combustible — it will not ignite and does not contribute fuel to a fire. LP SmartSide is a treated wood product; the treatment improves its fire resistance compared to untreated wood, but it remains a combustible wood-based material. For homeowners in Whatcom County thinking about wildfire exposure, insurance considerations, or just wanting one less combustible material on the exterior of the house, this is a straightforward, factual difference between the two products — not a marketing point.
Finish, Color, and Maintenance
James Hardie's ColorPlus finish is baked on at the factory in a controlled process, and it carries its own finish warranty separate from the substrate warranty. It's engineered to resist fading and chalking longer than field-applied paint, and touch-up is limited to occasional caulking and spot maintenance rather than a full repaint cycle.
LP SmartSide is typically field-primed or comes pre-finished depending on the product line, but like any painted exterior surface, it will need repainting on a cycle — and in a salt-air, high-moisture environment like Birch Bay, that cycle tends to run shorter than it would inland. Skipping or delaying a repaint doesn't just cost you curb appeal; on a wood-fiber product, it shortens the window before the protective coating starts to break down at the surface.
Installation Sensitivity: Side by Side
| Factor | James Hardie Fiber Cement | LP SmartSide |
|---|---|---|
| Core material | Cement, sand, cellulose fiber — no wood | Engineered wood strand with resin treatment |
| Cut-edge sealing | Not moisture-critical | Required on every field cut, every time |
| Combustibility | Non-combustible | Combustible (treated) |
| Finish | Factory-baked ColorPlus or field paint | Field-primed or pre-finished, repaints over time |
| Fastener/tooling needs | Requires cement-rated blades, correct nailing pattern | Standard wood-siding tools |
| Weight | Heavier, more crew handling | Lighter, easier to maneuver |
Neither product installs itself correctly. Both fail prematurely when the crew cuts corners — literally, in the case of unsealed edges. The difference is that fiber cement's failure modes are mostly about workmanship (flashing, gaps, fastener pattern), while engineered wood's failure modes include workmanship plus an ongoing maintenance obligation on the homeowner's side for the life of the siding.
Warranty Comparison
James Hardie backs its fiber cement products with a long, transferable limited warranty on the substrate, plus a separate finish warranty on ColorPlus color. Transferability matters at resale — it's one less question a buyer's inspector raises. LP SmartSide also carries a manufacturer warranty on its substrate, but warranty terms on any engineered wood product typically carry more exclusions tied to maintenance — proof of repainting on schedule, proper caulking, that kind of upkeep documentation. Read the actual warranty document for either product before you sign a contract; don't rely on a sales sheet summary.
Cost Factors to Weigh
We won't quote you a number here — every house, every tear-off scope, and every color/trim package changes the math, and made-up figures don't help you plan. What we will tell you is what actually drives the cost difference between the two systems:
- Material cost per square: fiber cement generally runs higher upfront than engineered wood siding
- Labor: fiber cement is heavier and requires specialized cutting tools, which affects install time and crew requirements
- Long-term repainting: engineered wood's ongoing maintenance costs add up over a 20-30 year ownership window
- Resale and insurance: non-combustible, longer-warrantied siding can factor into both
Get itemized quotes from any contractor you're considering, and ask specifically what's included — tear-off, house wrap, flashing detail, trim package, and paint or ColorPlus finish. A low bid that skips flashing detail isn't actually a lower cost; it's a deferred one.
A Homeowner's Evaluation Checklist
- Ask what climate-specific product line is being proposed (Hardie's HZ5 is built for our region — confirm any wood product's treatment and warranty terms for coastal, high-moisture use)
- Ask how cut edges will be sealed and who is responsible for verifying it on every board
- Ask for the actual warranty document, not a summary — read the maintenance requirements section
- Ask how the contractor handles flashing at windows, doors, and butt joints regardless of siding brand
- Ask what the realistic repaint or refinish cycle looks like for the specific product, in our specific climate
- Confirm whether the product and finish are combustible or non-combustible if that matters to your insurance or personal priorities
Why We Standardized on James Hardie
We've made a deliberate choice to install only James Hardie fiber cement, and it comes down to what we see holding up on homes around Birch Bay and the rest of Whatcom County over time. LP SmartSide is a legitimate, engineered product with real advantages — it's lighter, it's easier to work with, and it performs well when it's installed and maintained exactly as specified for its entire service life. But that maintenance dependency, combined with the moisture load our coastline puts on an exterior for months at a time, is a risk we'd rather not carry on our customers' behalf. Fiber cement gives us a non-combustible material with a factory finish, a strong transferable warranty, and a track record that doesn't hinge on a homeowner keeping up a repaint schedule. That's what we stand behind when we put our name on a job.
If you're weighing siding options for a home in Birch Bay, we're glad to walk your specific house — its exposure, its trim, its current siding condition — and give you a straightforward, no-pressure estimate for a James Hardie install. There's no obligation, and no pressure to sign anything on the spot.