Lynden Siding Exterior Work in Sumas, Washington
Sumas sits at the north edge of Whatcom County, right up against the Canadian border, in the flat farmland of the Nooksack valley. It's a small, close-knit town, and the homes here run the gamut from older farmhouses to newer builds on the surrounding acreage. What ties them together is the weather they all have to stand up to. Whatcom County doesn't get brutal winters, but it makes up for that with months of steady dampness — driving rain that comes in sideways during winter storms, humid air that never fully clears, and a moss season that can stretch from fall through spring if a house isn't set up to shed water and dry out.
We're based in Lynden, just down the road, and we've been working on homes in Sumas and the rest of the valley long enough to know what that moisture does to an exterior over time. It's not usually one dramatic failure — it's a slow accumulation. Moss and algae take hold on shaded, north-facing walls. Paint that looked fine for a few years starts chalking and peeling. Caulk joints open up. Wood trim goes soft at the corners. None of that happens overnight, but it happens, and it happens faster on siding materials that weren't built with this climate in mind.
Why We Only Install James Hardie Siding
We made the decision a while back to install one siding system on homes we work on: James Hardie fiber cement. That's not a marketing angle — it's a standard we hold ourselves to because of what we've seen play out on houses across this region.
Vinyl siding is affordable and low-maintenance in a lot of ways, but it can warp, fade, and crack under UV exposure and temperature swings, and it's a petroleum-based product that doesn't hold paint if a homeowner ever wants to change the color. Engineered wood products like LP SmartSide perform well when everything goes right, but they're wood-based, and wood-based siding depends heavily on caulking, flashing, and paint being maintained on schedule — miss a few years of upkeep in a climate this wet, and moisture finds a way in. Primed spruce and raw cedar are honest, traditional materials, but they ask for real ongoing maintenance — refinishing, sealing, watching for rot — that a lot of homeowners don't have the time or interest in keeping up with, especially with a long, damp Whatcom County winter working against them every year.
James Hardie fiber cement is cement, sand, and cellulose fiber. It doesn't absorb moisture the way wood-based products do, it won't warp or rot, and it's non-combustible. The ColorPlus factory finish is baked on under controlled conditions rather than field-painted, so it holds color and resists the chalking and fading that shows up on site-painted siding after a few Pacific Northwest winters. Hardie also engineers specific product lines (HZ5, HZ10) for different climate zones, so the siding going on a Sumas home is matched to the moisture and temperature conditions it'll actually face here. Backed by a strong transferable warranty, and installed correctly, it's the product we're comfortable standing behind on homes in this valley.
What We Handle Beyond Siding
Siding is our specialty, but the exterior of a house works as one system, and we handle the rest of that system too:
- Roofing — the first line of defense against the same driving rain and moss growth that affects siding; a roof that isn't shedding water properly sends that moisture straight down the wall assembly
- Windows — proper flashing and sealing around window openings is one of the most common places we find water intrusion on older homes; new windows installed with correct integration to the siding system matter as much as the windows themselves
- Decks — outdoor living space that takes the same year-round weather exposure and needs materials and construction that can handle standing moisture and freeze-thaw cycles
Looking at a home's siding, roofline, window flashing, and deck together, rather than as separate projects, tends to catch problems before they turn into bigger repairs — a leak at a window or a roof edge often shows up first as damage to the siding around it.
Why a Local Crew Makes a Difference
Working out of Lynden means we're familiar with how houses in this part of Whatcom County actually hold up — which walls get the worst moss growth, where driving rain tends to find weak points, how a house on open farmland near Sumas takes wind differently than one tucked into town. That local knowledge shapes how we plan flashing, siding gaps, and water management details on every job, not just how the siding looks going up.
It also means straightforward accountability. We're not a crew passing through the area for one project — we live and work here, and we install to a standard we're willing to stand behind for the long haul, on a product engineered to handle the conditions Sumas actually deals with.
Get an Estimate
If you're noticing moss buildup, fading paint, or soft spots on your home's exterior, or you're just planning ahead, we're glad to take a look. Reach out for a free, no-pressure estimate — we'll walk the property, answer questions honestly, and let you know what we'd recommend for your home.