How do I know if a siding contractor is actually qualified, not just licensed?

Ask how long they've specialized in exterior siding specifically, not just general remodeling, and ask what brands they install and why. A contractor who can explain the trade-offs of the products they don't install is usually more trustworthy than one who claims every product is great. Also check that they carry current WA state contractor licensing and adequate liability insurance before signing anything.

Is engineered wood siding like LP SmartSide ever a reasonable choice?

It can be, particularly in drier climates or on projects where the homeowner is committed to strict maintenance and the installer follows every sealing detail precisely. In a marine climate like Bellingham's, with sustained rain and salt air, the margin for error shrinks considerably. It's a legitimate product; we simply chose not to build our business around installing it here.

What's the actual difference between fiber cement and engineered wood siding?

Fiber cement, like James Hardie, is made from cement, sand, and cellulose fiber and doesn't have a wood substrate that can absorb and hold moisture. Engineered wood products like LP SmartSide use a treated wood strand core, so their long-term performance depends heavily on an intact factory coating and properly sealed cut edges. That structural difference is the main reason their moisture behavior and maintenance needs differ so much.

Does James Hardie siding need less maintenance than other options in Bellingham's climate?

With the ColorPlus factory finish, Hardie siding generally goes longer between repaints than paint-grade wood-based products, which matters given how much of the year Whatcom County stays damp. It also doesn't have a wood core that can swell or rot if a joint seal ages and cracks. It still benefits from periodic washing, especially to keep moss and algae from building up in shaded, low-sun areas.

Does Bellingham's coastal location actually affect how siding ages?

Yes — salt-laden air off the water accelerates the breakdown of paint finishes, caulking, and metal fasteners faster than an inland climate would. Combined with Whatcom County's long wet season and the shade-driven moss growth common on north-facing and tree-covered walls, materials that depend on an intact protective coating face more stress here than in a drier region. That's a major part of why we lean toward materials engineered for coastal, high-moisture conditions.

LP SmartSide: An Honest Look at Why We Don't Install It

What LP SmartSide Actually Is

LP SmartSide is an engineered wood siding product. At its core, it's strand-based wood — similar in concept to OSB sheathing — that's treated with zinc borate for insect and fungal resistance, then coated with a resin-saturated overlay and factory primer. It comes in lap boards, panels, and trim, and it's been on the market for decades under different generations of the SmartSide brand. It is not vinyl, and it is not fiber cement. It's wood, engineered to behave better than solid wood siding used to.

We get asked about it often enough that it's worth a straight answer: we don't install it. Not because it's a scam or a bad product on paper, but because of how it performs over time in a place like Bellingham, and because of the installation discipline it demands to hold up here. Below is our honest reasoning, not a takedown.

What LP SmartSide Gets Right

Credit where it's due. LP SmartSide solved real problems that plagued older solid-wood and hardboard sidings:

It's noticeably lighter than fiber cement, which makes it faster and less physically demanding to install.
It cuts and fastens more like traditional lumber, so crews familiar with wood framing pick it up quickly.
The zinc borate treatment genuinely improves resistance to rot and insects compared to untreated wood.
Upfront material cost is usually lower than fiber cement siding of comparable style.
LP backs it with a warranty that reads well on the sales sheet.

For a drier climate, or a project where budget is the deciding factor and the installer is meticulous about sealing every cut edge, SmartSide can be a reasonable choice. We're not going to pretend otherwise.

The Trade-Off We Can't Get Past: It's Still Wood

Engineered or not, LP SmartSide's core material is wood strand and resin. Wood swells when it absorbs moisture and shrinks when it dries. The entire performance of the product depends on an intact factory coating and airtight field sealing at every cut, joint, and fastener. The moment water finds a way into an exposed edge — through a missed caulk line, a nail that split the substrate, or years of UV breaking down a sealant bead — the wood underneath starts absorbing moisture the way any wood does.

That's a manageable risk in a place with a short, dry, predictable weather window. It's a much harder bet in Whatcom County. Bellingham sits right on the water, which means salt-laden air working on every exposed surface, plus a wet season that isn't really a season here — it's most of the year. Add in the moss and algae growth that thrives in our shaded, damp, low-sun-angle winters, and you have a climate that's actively working against any wood-based product's weak point: edge exposure and moisture cycling.

We've seen SmartSide installations elsewhere in the Pacific Northwest fail not because the product was defective, but because caulk joints that need annual inspection didn't get it, or because a single missed edge seal on a cut board let moisture in behind the coating. Once that starts, it's a slow, hidden failure — you often don't see it until paint is bubbling or a board has gone soft.

Where Moisture Gets In

Field-cut ends and rip cuts that expose raw substrate if not sealed immediately with the manufacturer-specified sealant
Butt joints and seams where caulk has shrunk, cracked, or been skipped
Fastener penetrations where the coating has been compromised
Bottom edges near grade, decks, or roof-to-wall transitions where splash-back and standing moisture are constant
Areas with reduced sun exposure, where moss and algae hold moisture against the surface for weeks at a time

Installation Sensitivity

SmartSide's manufacturer instructions are detailed and specific for good reason — this product does not tolerate installation shortcuts. Every cut edge has to be primed or sealed before the board goes up. Gaps at joints and penetrations have to be caulked to spec, not just for looks but for function. Clearance from grade, decks, and roofing has to be maintained precisely. Skip any one of these steps and you've created a moisture entry point that may not show a problem for a year or two — long after the crew that installed it has moved on to other jobs.

That's the core of our concern: the product's real-world durability rests almost entirely on installer discipline, on every single board, for the life of the siding. We'd rather not put a homeowner's investment on a system where one missed caulk bead in year one becomes a rot repair in year six.

Maintenance Burden Over Time

LP SmartSide is a paint-grade product, and it needs repainting on a cycle — typically similar to painted wood trim, so figure roughly every 7 to 10 years depending on sun exposure and coastal conditions, sooner in harsher spots. Caulk joints need periodic inspection and renewal, not a one-time install-and-forget. In a marine climate with salt air accelerating coating breakdown and a long damp season keeping surfaces wet longer between dry-outs, that maintenance schedule tends to compress rather than stretch.

For homeowners who enjoy staying on top of exterior maintenance, that's a manageable rhythm. For most people who want to reside a house and not think about it again for a couple of decades, it's a mismatch with expectations.

Warranty Structure — Read the Fine Print

LP's warranty covers manufacturing defects, but like most siding warranties, it includes conditions around proper installation according to their specifications, proper maintenance, and finish upkeep. If a failure traces back to an unsealed cut edge, a skipped caulk joint, or a maintenance gap, that's typically treated as an installation or maintenance issue, not a covered defect — regardless of how the wood underneath actually looks. That's not unique to LP; most manufacturers structure warranties this way. But it does mean the paper warranty offers less real protection than it appears to, especially on a wood-based product where installation and maintenance are doing most of the work to prevent failure in the first place.

How It Stacks Up Against James Hardie Fiber Cement

Factor	LP SmartSide	James Hardie Fiber Cement
Core material	Engineered wood strand + resin overlay	Cement, sand, and cellulose fiber — non-combustible
Moisture behavior	Wood substrate; performance depends on intact seal at every edge	Doesn't rot, warp, or absorb moisture like wood
Coastal/marine durability	Vulnerable at exposed cuts and aging caulk joints	Engineered to hold up in wet, coastal conditions when installed to spec
Finish	Paint-grade; needs repainting on a recurring cycle	ColorPlus factory-baked finish available, extends repaint intervals
Fire performance	Combustible wood-based material	Non-combustible
Upfront cost	Generally lower	Generally higher
Long-term maintenance	Caulk and paint upkeep is load-bearing for durability	Lower ongoing maintenance when installed correctly

Why We Standardized on James Hardie

We made a decision to install only James Hardie fiber cement siding, and it comes down to fit for this region. Hardie's HZ5 product line is engineered specifically for climates like ours — freeze-thaw cycling, sustained moisture, and salt air off the water. Fiber cement doesn't have a wood substrate that can swell, split, or rot if a caulk joint eventually fails. The ColorPlus factory finish holds up to UV and salt exposure far longer than field-applied paint, which matters on a house exposed to Bellingham's version of a wet season for most of the calendar year. It's non-combustible, which matters more every year as wildfire smoke seasons stretch longer even here on the coast. And Hardie backs it with a strong, transferable warranty structure that isn't as dependent on a perfect caulk bead surviving a decade of salt air and moss growth.

We're not saying every wood-based product is doomed to fail — plenty of SmartSide installations perform fine for years under the right conditions and diligent upkeep. We're saying that after weighing the maintenance burden, the installation sensitivity, and the way our specific climate stacks the deck against wood-based substrates, we decided we'd rather install one product we can stand behind completely than offer several and hope the installation and upkeep go perfectly on the ones with more exposure to failure.

A Practical Checklist If You're Comparing Siding Options

Ask what the substrate is made of, and how it behaves when it gets wet and stays wet for days
Ask what happens at every cut edge and joint during installation, and who is responsible if that detail is missed
Ask about the realistic repainting or refinishing cycle for your specific exposure — south-facing walls, shaded walls, and areas near the water all age differently
Read the warranty's exclusions, not just the headline years — installation and maintenance clauses matter more than the number on the brochure
Ask whether the product is rated non-combustible, especially if you're in a wildfire-smoke-prone area
Get a straight answer about why a contractor installs what they install — not just a sales pitch

Our Honest Bottom Line

LP SmartSide isn't a bad product — it's a wood-based product with real strengths, sold with a warranty that looks better on paper than it performs once you factor in installation-dependent exclusions. In Whatcom County's combination of salt air, driving rain, and a moss season that doesn't really end, we've seen enough real-world outcomes to know we don't want to gamble a homeowner's siding on flawless caulking holding for 20 years. That's why every house we side gets James Hardie fiber cement, installed to manufacturer spec, every time.

If you're weighing your options and want a straight answer about what will actually hold up on your specific house, in this specific climate, we're happy to walk the exterior with you and give you our honest take. Reach out for a free, no-pressure estimate — no upsell, just what we'd actually put on our own house.