Bellingham A Straight Answer About LP SmartSide
We get asked about LP SmartSide often enough that it deserves an honest, specific answer instead of a quick brush-off. It's a legitimate engineered wood siding product with a real following among builders, and it has genuine strengths. We simply don't install it, and we think homeowners in Bellingham and the rest of Whatcom County deserve to know exactly why before they choose a siding product for a home that has to survive decades of Pacific Northwest weather.
This isn't a takedown. It's the same reasoning we walk through with customers on their porch, based on how the product actually performs in the field over time, how forgiving it is to install correctly, and what happens to a homeowner's warranty coverage when something goes wrong ten or fifteen years down the road.
What LP SmartSide Actually Is
LP SmartSide is an engineered wood product made from strand-based wood fibers bonded with resins under heat and pressure, then coated with a treatment LP calls SmartGuard to resist moisture and fungal decay. It's not solid wood and it's not plywood — it's closer in manufacturing process to oriented strand board (OSB), just built specifically for exterior use with a factory primer or pre-finished coating.
Credit where it's due: LP has improved this product significantly since the OSB siding failures of the 1990s that led to major class-action settlements industry-wide. The current SmartGuard formulation is a real engineering improvement, it costs less than fiber cement, it's lighter to handle on a job site, and it holds a screw and nail well. For builders working on a tight budget in a dry climate, it's a reasonable choice.
Where It Performs Well
- Lower material cost than fiber cement siding
- Lighter weight, which can speed up installation labor
- Accepts paint and stain readily
- Resists denting better than vinyl in impact-prone areas
- Wide range of textures and panel styles available
Why We Don't Put It on Whatcom County Homes
It's Still Wood at Its Core
No matter how good the resin treatment is, LP SmartSide's core is wood fiber. Wood fiber swells when it absorbs water and it feeds fungal growth when moisture sits against it long enough. The SmartGuard treatment is a real barrier, but it's a barrier that has to stay intact at every cut edge, every nail penetration, and every seam for the life of the siding. Bellingham sits in a marine climate with salt-laden air off the Georgia Strait, driving rain that comes in sideways during fall and winter storms, and a moss season that runs longer here than almost anywhere else in the state. That combination is exactly the environment where a wood-based product's weak points get tested hardest, year after year.
Every Cut Edge Is a Vulnerability
Factory faces of LP SmartSide are treated at the mill. Field cuts are not. Every time a panel gets trimmed to fit a window, a corner, or a utility penetration, that exposed edge needs to be sealed with the manufacturer's specified sealant or edge treatment before installation, and it needs to stay sealed. On a real job site, with dozens or hundreds of cuts, that's a lot of places relying on perfect caulk work holding up for 20-plus years in constant rain. We've watched enough siding jobs age to know that caulk is the first thing to fail, and it fails invisibly, behind the surface, long before a homeowner notices a problem.
Maintenance Isn't Optional, It's Structural
LP is upfront that SmartSide requires ongoing maintenance: periodic repainting, re-caulking of joints and trim, prompt repair of any impact damage, and keeping the bottom edge of the siding a minimum distance above grade, decks, and roof lines so it never sits in standing water or snow. That's not a scare tactic — it's in LP's own installation and warranty documentation. The problem is that maintenance requirements which are inconvenient in Arizona become genuinely demanding in a county that gets over 35 inches of rain a year and long stretches of damp, mossy shade under evergreen tree cover. Skipping a repaint cycle or letting caulk lines go one season too long is a bigger gamble here than almost anywhere else in the Lower 48.
Warranty Structure Worth Reading Closely
LP SmartSide's limited warranty is prorated after an initial period, meaning the manufacturer's payout for a failure shrinks the longer you've owned the siding. Workmanship coverage tied to a certified installer is typically shorter than the material warranty itself, and the two don't always line up if something goes wrong at year 12 versus year 25. We don't think that's dishonest on LP's part — prorated warranties are standard in this product category — but it means the homeowner absorbs more of the risk the longer they own the house, which is the opposite of what most people assume when they hear "warrantied siding."
How It Actually Compares to James Hardie
| Factor | LP SmartSide | James Hardie Fiber Cement |
|---|---|---|
| Core material | Engineered wood strand, resin-treated | Cement, sand, and cellulose fiber — non-combustible |
| Moisture behavior | Resists moisture if edges/finish stay intact | Does not swell, rot, or feed fungal growth |
| Factory finish | Primed or pre-finished; repainting eventually required | ColorPlus baked-on finish, no repainting for years |
| Fire exposure | Combustible wood product | Non-combustible, Class A fire rating |
| Climate engineering | One general product line | HZ product lines engineered for specific climate zones |
| Warranty structure | Prorated after initial period | Long-term limited warranty, transferable to new owners |
| Upfront material cost | Lower | Higher |
The upfront cost gap is real, and we won't pretend otherwise. But siding is a 20-to-40-year decision, and the gap in maintenance burden and moisture risk over that timeline is where the real cost comparison plays out, especially in a climate like ours.
Why We Standardized on James Hardie Instead
We made a decision as a company to install only James Hardie fiber cement siding, and it comes down to the same climate reasoning above. Hardie's HZ5 product line is specifically engineered for regions with the kind of moisture exposure Whatcom County gets — cement-based siding doesn't have a wood core to protect, so it doesn't swell, delaminate, or feed rot the way an engineered wood product can if a seal fails somewhere. The ColorPlus factory finish means our customers aren't on a forced repainting schedule to keep their warranty valid. And Hardie's warranty coverage is structured to hold up over a longer ownership timeline, including when a home changes hands.
We're not saying LP SmartSide is a bad product for every application. We're saying that after years of doing tear-offs, repairs, and re-siding jobs across Bellingham, Ferndale, Lynden, and the rest of Whatcom County, we've seen where wood-based siding struggles in this specific climate, and we decided we'd rather install one product we can stand behind completely than offer a menu of options with different risk profiles.
What to Check If You Already Have LP SmartSide
If your home already has LP SmartSide installed, it doesn't mean you have a problem — it means you have a maintenance schedule to stay on top of. Here's what we'd walk any homeowner through during an inspection:
- Check caulk lines at every seam, corner, and trim joint for cracking or gaps, especially after winter storms
- Look for soft spots, swelling, or dark staining near the bottom edge of panels close to grade, decks, or roof lines
- Confirm the siding maintains proper clearance above grade, walkways, and roof surfaces
- Check the paint or finish coat for chalking, peeling, or thinning that would expose the substrate
- Inspect around penetrations — hose bibs, vents, light fixtures — where field cuts are common and factory sealing doesn't reach
- Watch for moss and algae buildup, which holds moisture against the surface longer in shaded, damp areas
Catching an issue early, before it spreads behind the panel, is the difference between a caulk touch-up and a section replacement.
Making the Right Call for Your Home
Every siding product involves trade-offs, and LP SmartSide's trade-offs are reasonable ones for some builders and some climates. Ours is a wet, salt-air, moss-heavy corner of the country, and after weighing installation sensitivity, long-term maintenance demands, and warranty structure against what fiber cement offers, James Hardie is the product we're willing to put our name behind. If you're deciding between siding options, weighing a repair against a full re-side, or just want a second opinion on what's already on your house, we're happy to come take a look and give you a straight answer — no pressure, no sales script, just what we'd do on our own home. Reach out for a free estimate and walk-through.