Skagit County LP SmartSide: A Fair Look Before We Explain Our Standard
LP SmartSide is an engineered wood siding product, and it has real advantages worth acknowledging. It's lighter than fiber cement, easier on cutting tools and installer backs, and it holds paint well when properly maintained. For inland, dry climates it has a solid track record. We don't install it, and homeowners in Skagit County deserve a straightforward explanation of why — not vague warnings, just the trade-offs we weighed before deciding what goes on the houses we work on.
What LP SmartSide Actually Is
SmartSide is made from wood strands bonded with resins, then treated with a zinc borate coating for insect and fungal resistance and finished with a factory primer or coating. It's engineered wood, not solid lumber — which solves some of the warping and knot problems of old-style cedar and spruce siding. But it's still a wood-based product at its core, which means its long-term performance depends heavily on keeping moisture out and keeping every cut edge and seam properly sealed.
Why Our Climate Changes the Math
Skagit County sits in a specific kind of tough spot for siding. We get salt-laden air moving in off the Sound and the Strait, long stretches of driving, wind-blown rain rather than gentle vertical rainfall, and a moss and mildew season that can run most of the year in shaded, north-facing exposures. That combination puts sustained moisture pressure on any wood-based product, and it puts it there for months at a time, not just during a few storms.
Wood-based siding products can perform well in this climate, but only when every detail is executed correctly and maintained on schedule: field-cut edges sealed the day they're cut, caulking checked and renewed on a real schedule, gutters and flashing kept clear so water sheds away from the wall rather than sitting against it. In our experience across Western Washington homes, that level of ongoing maintenance discipline is the exception, not the rule — homeowners are busy, siding is out of sight, and a missed caulk line doesn't announce itself until moisture has already gotten into the substrate.
The Core Trade-Off
This isn't about LP SmartSide being a bad product. It's about matching a product's maintenance requirements to how houses actually get maintained in the real world, in a climate that doesn't give you much room for error.
- Moisture sensitivity: As an engineered wood product, its long-term durability depends on the coating and sealed edges staying intact — a bigger ask in a marine, high-rainfall climate than in a drier region.
- Field-cut vulnerability: Every cut made on site is a potential entry point for moisture unless it's sealed immediately and correctly, every time, on every job.
- Ongoing upkeep: Caulking, touch-up, and inspection aren't optional extras — they're part of what keeps the warranty valid and the wall assembly dry.
- Combustibility: As a wood-based product, it does not offer the same fire-resistance profile as fiber cement, which matters to some homeowners given the wildfire smoke and ember exposure the whole region has seen in recent summers.
Why We Standardized on James Hardie Instead
We made a decision as a company to install one siding system — James Hardie fiber cement — rather than offer several products with different risk profiles. Fiber cement doesn't rely on a coating to keep water out of its core; the material itself is inorganic and doesn't swell, rot, or feed fungal growth the way wood-based products can if moisture gets in. That matters directly here, where moss and mildew pressure is a year-round consideration rather than a seasonal one.
Hardie's HZ product lines are engineered specifically for climate zones like ours, factory-finished ColorPlus color goes on before the siding ever reaches a wall (so the finish isn't dependent on field application and touch-up the way it is with some engineered wood systems), and the product is non-combustible. It also carries a strong transferable warranty backed by a manufacturer with decades of performance data in wet, coastal climates — not just ours in the Pacific Northwest.
None of this means every home that ever had SmartSide installed is in trouble, or that the product can't be installed correctly. It means that when we looked at what actually holds up, with the least ongoing maintenance burden, against salt air, driving rain, and a long moss season, fiber cement was the clear answer for the standard we wanted to hold ourselves to on every job.
What This Means If You're Comparing Options
If you're currently researching siding replacement in Skagit County and have SmartSide, vinyl, or cedar on your list alongside fiber cement, ask any contractor bidding the job pointed questions: What's the manufacturer's warranty structure, and does it transfer if you sell the home? What ongoing maintenance does the product require, and on what schedule? How does the product handle sustained moisture exposure specific to our marine climate, not a national average? Those answers matter more than the brochure.
If you'd like to talk through your specific home, exposure, and budget, we're happy to walk the property with you and give you a straightforward, no-pressure estimate — no obligation, just an honest look at what we'd recommend and why. Use the form below to get started.