Birch Bay Siding Two Different Materials, One Decision
If you're re-siding a home in Birch Bay, you've probably run into two products competing for your business: James Hardie fiber cement and LP SmartSide engineered wood. Both are marketed as upgrades over vinyl. Both look good in a showroom. But they are built from fundamentally different materials, and those materials behave very differently once they're facing Whatcom County's marine weather year after year. This page walks through both products honestly — what each one is, where each holds up, and why our crews install only James Hardie on the homes we side.
Why This Comparison Matters More Here Than Inland
Birch Bay sits directly on the water, which means siding here deals with a combination most inland Washington towns don't: salt-laden air off the bay, wind-driven rain that hits walls sideways instead of falling straight down, and a long, damp moss season that can run from October through May. Siding material choice matters everywhere, but the margin for error shrinks considerably this close to saltwater.
What LP SmartSide Actually Is
LP SmartSide is an engineered wood product — strand board made from wood fibers, resin, and wax, pressed and treated with a zinc borate preservative to resist fungal decay and insects, then finished with a treated outer layer. It's manufactured to be more dimensionally stable and rot-resistant than old-school solid wood or hardboard siding from decades past, and LP backs it with a real warranty. It's lighter than fiber cement, easier on installers' backs, and it takes fasteners and cuts more like traditional wood, which some carpentry crews prefer.
Where SmartSide Gets It Right
To be fair to the product: LP has genuinely improved on the wood-composite siding failures of the 1990s. The zinc borate treatment does provide real protection against rot and insects when the product is installed and maintained correctly, and the panels are more consistent in thickness and profile than old wood lap siding. For homeowners who want the classic wood-grain look and understand the maintenance commitment, it's not a scam product — it's a legitimate engineered wood system.
Where Engineered Wood Runs Into Trouble in a Marine Climate
The core issue with any wood-based siding, including engineered wood, is that its base material is still organic. Wood fiber wants to absorb moisture, and once moisture gets past the factory coating — through a cut edge, a nail hole, a caulk joint that's failed, or a scratch from a ladder or hedge trimmer — the clock starts on decay, regardless of how good the treatment was on day one.
Moss, Shade, and Standing Moisture
Birch Bay's moss season isn't just a roof problem. North-facing walls, siding tucked under deep eaves, and anything shaded by mature evergreens stay damp for extended stretches most winters. Moss and algae hold moisture directly against the siding surface far longer than open, sun-exposed walls dry out. On an engineered wood product, that sustained dampness at butt joints and cut edges is exactly the exposure the factory treatment is weakest against.
Salt Air and Coastal Exposure
Salt-laden air accelerates the breakdown of caulking, sealants, and paint films faster than it does inland. Every wood-based siding system depends on an intact protective layer to keep moisture out of the substrate. When that layer degrades faster near the water, maintenance intervals have to get shorter — recaulking, repainting field-cut edges, and touching up scuffs becomes a more frequent obligation, not an occasional one.
Field Cuts Are the Weak Point
Every piece of siding gets cut on site to fit around windows, doors, corners, and utility penetrations. On engineered wood, every one of those cut edges exposes raw, untreated core material unless the installer field-treats it with sealant before installation — a step that's easy to skip and hard for a homeowner to verify after the fact. Miss it consistently across a house, and you've built in dozens of entry points for moisture before the first winter even arrives.
What James Hardie Fiber Cement Is Made Of
James Hardie siding is cement, sand, and cellulose fiber, cured into a rigid board. There's no wood pulp core to rot, no organic substrate for fungus to feed on, and no risk of insect damage. It's inorganic from the core out — the material itself doesn't decay, it simply doesn't offer the biology that decay needs to take hold. That single difference is why fiber cement has become the standard for homes in wet, coastal, and high-moss-exposure regions like Whatcom County.
Built for the Pacific Northwest Specifically
James Hardie makes climate-specific product lines, and the HZ5 line is engineered for regions like ours — freeze-thaw cycles, sustained moisture, and coastal exposure. That's not a generic siding product with a marketing label; the formulation and testing are built around the exact conditions Birch Bay throws at a wall.
Non-Combustible Construction
Fiber cement doesn't burn. In a region where wildfire smoke and ember exposure have become a more regular summer concern across Washington, that's a real, practical difference between an inorganic material and any wood-based siding, engineered or not — not a scare tactic, just a fact about what each product is made of.
ColorPlus Factory Finish vs. Field-Painted Systems
This is one of the most underappreciated differences between the two products. James Hardie's ColorPlus finish is baked on in a controlled factory environment, in multiple coats, then cured — producing a bond and consistency that field-applied paint, done on a ladder in variable weather, can't fully replicate. LP SmartSide can come factory-primed, but final color is typically field-applied, which means the paint job's quality depends heavily on the weather conditions and the crew's skill on the day it's painted.
| Factor | James Hardie ColorPlus | LP SmartSide (field-painted) |
|---|---|---|
| Where finish is applied | Factory, controlled environment | Job site, weather-dependent |
| Typical repaint interval | 15 years or longer | 5-10 years, sooner near saltwater |
| Color consistency | Uniform across all boards | Varies with application conditions |
| Touch-up matching | Manufacturer-matched touch-up available | Depends on stored paint / color match |
Warranty Structures Compared
Both manufacturers offer real, meaningful warranties — this isn't a case of one company standing behind its product and the other not. But the structures differ in ways worth understanding before you sign a contract.
- James Hardie: Non-prorated limited warranty on the substrate (typically 30 years residential), with a separate finish warranty on ColorPlus product, and the warranty is transferable to a subsequent homeowner if the home sells — a real factor in resale value.
- LP SmartSide: A limited warranty covering the substrate against fungal decay, with separate, often shorter, coverage on the finish depending on whether it was factory-finished or field-painted, and warranty terms can be affected by whether field-cut edges were properly treated at installation.
The practical takeaway: read the exclusions on any siding warranty, not just the headline number. Improper installation, unsealed cuts, and lack of maintenance can void coverage on either product — but the exposure for a moisture-sensitive material is higher because there are more ways to trigger those exclusions.
Installation Sensitivity — Why the Crew Matters as Much as the Product
Neither product performs to its potential with a sloppy install. But the tolerance for error is different. Fiber cement installed with the wrong fasteners, insufficient clearance from grade or roofing, or improper joint flashing will still develop problems — moisture management matters on any siding system. Engineered wood adds an additional layer of installation-sensitive steps: every cut edge needs to be sealed, panel joints need correct clearances to allow for expansion, and fastener placement has to avoid splitting the substrate. More steps where a shortcut causes a problem means more opportunities for a rushed or undertrained crew to set a homeowner up for early failure, regardless of which manufacturer's name is on the product.
Cost Factors Over the Life of the Siding
Sticker price on the day of installation isn't the full financial picture. Consider the cost drivers over a 20-30 year ownership horizon:
| Cost Factor | James Hardie | LP SmartSide |
|---|---|---|
| Material + install cost | Higher upfront | Generally lower upfront |
| Repainting over 25 years | Rarely needed, ColorPlus dependent | Likely 2-4 repaint cycles |
| Moisture-related repair risk | Low — inorganic substrate | Moderate — depends on maintenance discipline |
| Resale / appraisal perception | Widely recognized premium material | Solid, but perceived as a step below fiber cement |
A Homeowner's Checklist for Comparing Bids
Whichever direction you're leaning, use this list when you're evaluating contractor proposals:
- Ask exactly which HZ zone or climate-rated product line is being quoted, not just "James Hardie" as a generic term.
- Confirm whether cut edges will be factory-sealed, field-sealed with manufacturer-approved product, or left untreated.
- Get the warranty document itself, not a verbal summary — read the exclusions section specifically.
- Ask how the crew handles flashing at windows, doors, and roof-to-wall transitions, since that's where most siding failures actually start.
- Confirm whether the finish is factory-applied or will be painted on site, and what that means for your repaint schedule.
- Ask for the manufacturer certification status of the installing crew, not just the company's general experience.
Why We Standardized on James Hardie
We made a deliberate decision to install only James Hardie fiber cement, and it comes down to the marine environment we work in every day. Birch Bay homes take on salt air, driving rain, and a genuinely long moss season, and we've found that an inorganic, non-combustible material with a factory-cured finish and a transferable warranty gives homeowners the best odds of a siding job that still looks right in year twenty without a repaint schedule that never lets up. LP SmartSide is a legitimate product for the right application, but for the specific conditions on this stretch of coastline, fiber cement is what we're willing to put our name behind.
If you're weighing siding options for a Birch Bay home, we're happy to walk your specific house — sun exposure, shaded walls, current siding condition — and give you a straight answer on what it needs. Use the form below to request a free, no-pressure estimate.