Bellingham Siding One Product, Installed Correctly
Homeowners sometimes ask why we don't offer a menu of siding brands the way some contractors do. The honest answer is that we used to look at all of them, and after years of tear-offs and repair calls around Whatcom County, we narrowed our installs to one system: James Hardie fiber cement. Not because we get something for saying that, but because it's the product that holds up to what Bellingham weather actually does to a house — salt-laden air off Bellingham Bay, driving rain that comes in sideways for months at a time, and a moss season that seems to start earlier every year.
This page explains what James Hardie is, why it's engineered the way it is, and what a correct installation looks like. We'll cover the trade-offs of other products elsewhere on this site — here, we're focused on what we actually put on homes.
What Fiber Cement Actually Is
James Hardie siding is made from a mix of Portland cement, sand, and cellulose fiber, cured into rigid boards and panels. It's not a wood product and it's not a plastic product — it's a composite that behaves more like masonry. That matters in a marine climate for a few concrete reasons:
- It doesn't absorb water the way wood-based siding can. Fiber cement is dimensionally stable, so it doesn't swell, cup, or delaminate when it takes on moisture the way engineered wood products can if the finish is compromised.
- It's non-combustible. That's a genuine safety advantage, and increasingly relevant to insurance conversations in Washington.
- It doesn't feed moss and algae the way bare or lightly coated wood siding does. Given how much of the year Bellingham spends damp, this alone cuts down on the pressure-washing and re-coating cycle a lot of homeowners get stuck in.
- It holds a factory finish far longer than field-applied paint on wood siding. That's the ColorPlus system, covered below.
The HZ5 Climate Engineering
James Hardie makes region-specific formulations under what they call their HZ (Hardie Zone) system. Whatcom County falls into a wet, marine climate zone, and the HZ5 product line is engineered for exactly that: heavier moisture exposure, freeze-thaw cycling, and prolonged damp periods rather than dry heat. This isn't a marketing label — the fiber cement formulation and moisture management specs differ by zone. We install the HZ5 line because it's actually built for this coastline, not a generic national product.
ColorPlus Factory Finish
A lot of the long-term performance problems we see with other siding types trace back to the finish, not the substrate. Field-applied paint — whether on cedar, primed spruce, or repainted fiber cement — is only as good as the weather conditions on the day it was sprayed and the maintenance that follows.
James Hardie's ColorPlus finish is baked on in a factory setting, under controlled temperature and cure conditions, with multiple coat layers and a UV-resistant topcoat. It comes with its own 15-year finish warranty separate from the product warranty. In practice, that means the color holds, doesn't chalk out early, and doesn't need repainting on the timeline that field-finished siding does. In a climate where ladder work in January is nobody's idea of a good time, that's not a small thing.
Product Lines We Install
| Line | Typical Use |
|---|---|
| HardiePlank lap siding | The standard horizontal siding for most Bellingham homes — several profiles and exposures available |
| HardiePanel vertical siding | Board-and-batten look, common on gables, shops, and modern builds |
| HardieTrim | Fascia, corner boards, and window trim that won't rot the way dimensional wood trim does |
| HardieSoffit | Pre-finished soffit panels for eaves and porch ceilings |
Why Installation Quality Is Half the Equation
Fiber cement is only as good as the install behind it. Correct James Hardie installation means proper clearance off grade and roof lines, correct fastener placement and spacing, factory-primed cut edges sealed in the field, proper flashing and weather barrier detail behind every seam, and manufacturer-specified nailing patterns rather than whatever's fastest. This is where a lot of siding problems actually originate — not from the product itself, but from shortcuts taken during installation. It's a big reason we standardized on one system: we can train our crews to install it to spec every time, rather than juggling install methods across five different product lines.
The Warranty
James Hardie backs its siding with a transferable limited warranty (30 years on most siding products), plus the separate finish warranty on ColorPlus color. Warranty coverage is tied to installation meeting Hardie's published specifications, which is another reason correct installation isn't optional — it's what keeps the warranty intact if you ever need it.
Our Position
We're a Bellingham-based crew, and we've seen what Whatcom County's rain, wind, and salt air do to a house over a decade or two. We stopped installing other siding products because we got tired of seeing early failures tied to moisture exposure or finish breakdown that a better substrate and factory finish would have avoided. James Hardie isn't the cheapest option on day one, but it's the one we're willing to put our name behind.
If you're weighing siding options for a home in Bellingham or elsewhere in Whatcom County, we're happy to walk your property, talk through what James Hardie would look like on your house, and give you a straightforward, no-pressure estimate.