Lynden Siding What Aldergrove, BC Homes Need From Their Siding
Aldergrove sits just across the international line from our home base in Lynden, in the same weather system that soaks Whatcom County and the northern Fraser Valley for most of the year. That means the same three things that wear out siding on our side of the border wear it out on yours: salt-tinged marine air pushing in off the Strait of Georgia and the Sound, wind-driven rain that hits walls sideways instead of falling straight down, and a moss and algae season that can run eight months or longer in shaded, north-facing exposures. Siding here isn't decorative — it's a full-time moisture management system, and it has to be installed like one.
A lot of siding failure we see on older homes in this area isn't really a product failure. It's an installation failure that took years to show up: caulk used where flashing should have been, house wrap seams that weren't lapped correctly, trim boards nailed tight against the sheathing with no drainage gap behind them. In a dry climate those shortcuts might never matter. Here, they turn into soft sheathing, stained soffits, and paint that won't hold, usually inside five to ten years.
Why Hire a Crew That Already Works This Area
A siding crew that mostly works inland or in drier climates tends to detail walls the way their region taught them to — because that's what's worked for them. A crew that works the Whatcom County and southern Fraser Valley corridor day in and day out has already seen what this specific climate does to a home over ten and twenty years, and builds every installation around that, not around a generic install manual.
That local pattern-recognition shows up in small decisions that add up: how wide we hold butt joints on exposed south and west walls, where we add extra flashing on horizontal trim runs that catch driving rain, which wall assemblies need a rainscreen gap and which don't. None of that is exotic — it's just what happens when you've installed and later re-inspected siding on hundreds of homes in the same rain patterns your home sits in.
What We Bring to a Job in Aldergrove
- Familiarity with the same wind-driven rain and moss exposure patterns common across the northern Fraser Valley and Whatcom County border region
- A crew that installs one product system — James Hardie — instead of switching techniques between three or four different materials
- Detailing built around long-term moisture performance, not just a fast, clean-looking install day
- Straight answers about what your home's exposure actually needs, not a one-size-fits-all quote
James Hardie: The Only Siding System We Install
We install James Hardie fiber cement siding exclusively. We don't install vinyl, LP SmartSide, Cemplank, Allura, or primed wood siding, and that's a deliberate standard, not an oversight. Vinyl expands and contracts significantly with temperature swings and can crack or warp under the freeze-thaw cycling this region gets in winter. Engineered wood products depend on an unbroken factory coating to keep moisture out of the wood strand core, and any field cut, fastener miss, or caulk failure becomes a slow-moving problem in a climate this wet. Fiber cement doesn't have either weakness — it's non-combustible, dimensionally stable, and doesn't feed moisture into a wood substrate the way engineered wood products can.
James Hardie's HZ5 product line is engineered specifically for climates with freeze-thaw cycling and sustained moisture exposure, which describes this region well. The factory-applied ColorPlus finish is baked on under controlled conditions rather than field-painted, so the color and the moisture barrier are the same layer — there's no separate paint job that can fail independently of the siding underneath it.
| Factor | James Hardie Fiber Cement | Vinyl / Engineered Wood |
|---|---|---|
| Moisture behavior | Non-combustible, dimensionally stable, doesn't swell or rot | Vinyl can warp; engineered wood relies on an intact coating to protect the wood core |
| Coastal / salt air exposure | Formulated to hold up under sustained damp, salt-influenced air | Coatings and seams are more exposed to breakdown over time |
| Finish | Factory-baked ColorPlus finish, consistent and durable | Field-painted or factory coatings that vary in longevity |
| Fire resistance | Non-combustible material | Vinyl and wood-based products are combustible |
| Warranty structure | Long, transferable manufacturer warranty when installed to spec | Varies widely by product and manufacturer |
What a Correct Installation Actually Involves
The siding board itself is only part of the system. Most of the long-term performance comes from what's underneath it and how it's fastened, and this is where a lot of the difference between a ten-year job and a thirty-year job gets decided.
The Weather-Resistive Barrier
A properly lapped and sealed water-resistive barrier behind the siding is the backup layer that keeps a home dry even if wind-driven rain gets past the cladding — which it will, occasionally, in a climate like this. Seams need to be taped or lapped shingle-style, every penetration needs to be flashed, and the barrier needs to tie in correctly around windows, doors, and trim.
Fastening and Clearances
James Hardie specifies exact fastener types, spacing, and placement, and specifies minimum clearances from grade, roofing, and other horizontal surfaces where water can pool or splash back onto the siding. Skipping these specs is one of the most common ways an otherwise good product fails early — and it's invisible from the ground once the job is finished.
Flashing at Every Transition
Windows, doors, deck ledgers, and roof-to-wall intersections are where water finds its way in. Caulk is a maintenance item, not a waterproofing strategy — every one of these transitions needs actual metal or membrane flashing that sheds water down and out, not caulk relied on to do that job by itself.
Our Installation Process
- On-site assessment — we look at your home's actual exposure: which walls take the worst weather, what condition the existing siding and sheathing are in, and whether there's hidden moisture damage to address before new siding goes on.
- Written estimate — a clear scope of work and pricing, so you know what's included before anything starts.
- Tear-off and inspection — removing old siding gives us a direct look at the sheathing and framing underneath, which is often the only chance to catch and repair rot before it's sealed back up.
- Weather barrier and flashing — installed and lapped correctly at every seam, corner, and penetration before a single board goes up.
- Hardie installation — installed to manufacturer fastening, spacing, and clearance specifications, not shortcuts that happen to look right on install day.
- Final walkthrough — we go over the finished job with you before we consider it done.
Signs Your Current Siding Needs Attention
- Paint that's peeling, bubbling, or chalking faster than it used to
- Soft or spongy spots when you press on the siding, especially near the bottom courses
- Persistent moss or algae growth that comes back within weeks of cleaning
- Visible warping, cupping, or gaps opening up at board seams
- Stained or discolored soffits and trim, which often points to water tracking behind the siding
- Rising energy bills with no other explanation, which can mean the wall assembly is no longer doing its job
Cost Factors for a Siding Installation
Every home is different, but the price of a siding job is driven by a fairly consistent set of factors. Broadly, fiber cement installation runs in the range of roughly $10–$18 per square foot installed, though your home's specifics can push that higher or lower — we'll always give you a firm written number after seeing the job in person, and can quote in either currency given the cross-border service area.
| Factor | Why It Matters |
|---|---|
| Home size and wall complexity | More corners, dormers, and trim details mean more labor and material |
| Condition of existing sheathing | Rot repair found during tear-off adds cost but is far cheaper to fix now than later |
| Siding profile chosen | Lap, shingle, and panel styles differ in material and installation time |
| Trim and accessory scope | Corner boards, soffit, and fascia work done alongside siding affects total cost |
| Site access | Difficult access, multiple stories, or tight lot lines affect labor time |
Living With Fiber Cement Siding Here
James Hardie siding needs far less upkeep than wood, but "less" isn't "none," especially with the moss pressure this region sees. A yearly rinse-down on shaded or north-facing walls keeps moss and algae from taking hold, and it's worth walking the perimeter once a year to check caulking at trim joints and make sure nothing is holding standing water against the siding. Because the ColorPlus finish is baked on at the factory rather than painted on-site, you're not on a repainting cycle the way you would be with wood or field-finished products — that's one of the bigger practical advantages homeowners notice a few years in.
If your Aldergrove home's siding is past its prime or you're planning ahead, we're happy to take a look and give you a straightforward, no-pressure written estimate — just fill out the form below.