Birch Bay Siding What LP SmartSide Actually Is
LP SmartSide is an engineered wood siding product — strand-based wood fiber treated with resins and zinc borate, then coated with a factory finish. It's a legitimate building product, and a step up from old untreated hardboard siding that gave engineered wood a bad reputation decades ago. LP has put real engineering into moisture resistance and pest protection. We're not here to tell homeowners it's a scam. We simply don't install it, and we think Birch Bay homeowners deserve to know why before they choose a siding product for their home.
The Core Issue: It's Still Wood
At its core, SmartSide is wood fiber. Wood — even engineered, resin-treated wood — expands, contracts, and reacts to moisture in ways that fiber cement simply doesn't. Birch Bay sits right on Semiahmoo Bay, which means homes here deal with salt-laden air, driving rain off the water, and a moss-and-mildew season that can run most of the year in the shade of a tall Douglas fir line. That's a tough environment for any wood-based product, no matter how well it's treated at the factory.
The zinc borate treatment in SmartSide is designed to resist fungal decay and insects, and it does a reasonable job of that when the product is installed correctly and maintained. The catch is "installed correctly and maintained." SmartSide's manufacturer warranty is explicit that cut edges, drilled holes, and any exposed wood fiber need to be field-primed and sealed before the piece goes on the wall. Miss a cut edge, skip a caulk joint, or let paint film break down at a seam years down the road, and that's exactly where moisture finds its way into the substrate. In a climate like ours, with weeks of sustained wet weather in the fall and winter, that margin for error is thin.
What We See in Coastal Whatcom County
We're not going to invent failure statistics — every siding product performs differently depending on installer skill, detailing, and site conditions. What we can speak to honestly is the maintenance profile. Engineered wood siding, including SmartSide, needs repainting on a cycle to keep its protective film intact, and homeowners on the water side of Birch Bay or along Semiahmoo Bay Drive deal with salt spray that accelerates coating wear compared to inland homes. Add in the moss and algae growth that's a fact of life under our tree canopy and marine layer, and you've got a product that asks for more attention over its lifespan than we're comfortable promising homeowners it won't need.
None of this makes SmartSide a bad product for every climate or every home. It has genuine advantages — it's lighter than fiber cement, easier on installers' backs, and takes fasteners and cuts with standard woodworking tools. In drier inland climates with less sustained moisture exposure, it holds up reasonably well. Birch Bay's marine environment just isn't that climate.
Why We Standardized on James Hardie
We made a business decision a while back to install one siding system and install it well, rather than offer several products and hope each one gets detailed correctly. We chose James Hardie fiber cement.
- Non-combustible core. Hardie's fiber cement composition doesn't burn, which matters increasingly to insurers and to homeowners paying attention to wildfire-smoke seasons across the Pacific Northwest.
- Climate-engineered product lines. Hardie's HZ5 formulation is specifically engineered for the cold, wet Pacific Northwest climate zone that includes Whatcom County, rather than a one-size-fits-all national spec.
- ColorPlus factory finish. The baked-on finish resists the fading and chalking that field-applied paint on wood siding eventually shows, and it holds up better against the UV and salt exposure common along the Birch Bay shoreline.
- Moisture behavior. Fiber cement doesn't swell, rot, or provide a food source for the fungal growth that thrives in our long moss season. It's mineral-based, not organic.
- Warranty structure. Hardie backs its product with a strong, transferable limited warranty, which matters to buyers if a home sells before the siding's service life is up.
That doesn't mean Hardie siding is maintenance-free — no exterior product is. It still needs proper caulking, flashing, and periodic washing to deal with coastal grime and moss. But the failure points we worry about with engineered wood — exposed cut edges, coating breakdown, moisture wicking into the substrate — are a much smaller concern with a cement-based product.
Our Honest Recommendation
If you're comparing siding options for a home in Birch Bay or elsewhere in Whatcom County, ask any contractor — including us — to walk you through how a product performs specifically in a marine, high-moisture climate, not just how it performs on a spec sheet. We install James Hardie exclusively because after weighing the trade-offs for our climate, it's the product we're willing to stand behind long-term.
If you'd like to talk through your home's siding, exposure, and options, we're glad to come take a look. Reach out for a free, no-pressure estimate — no obligation, just a straight answer about what makes sense for your house.