Birch Bay If you're re-siding a home in Birch Bay, you've almost certainly priced out vinyl. It's the most common siding in America for a reason — it's inexpensive, widely available, and easy for crews to install fast. But we don't install it, and we think homeowners on this stretch of Whatcom County coastline deserve a straight explanation of why, not a sales pitch. This page lays out what vinyl does well, where it struggles in our specific climate, and why James Hardie fiber cement is the only product we put on houses.
What Vinyl Siding Actually Is
Vinyl siding is extruded PVC (polyvinyl chloride) formed into panels that interlock and hang on a house using a nailing flange, with room built into the fastening system for the material to expand and contract with temperature swings. It's been around since the 1960s and has improved a lot since then — better UV stabilizers, thicker profiles, and insulated backer options are all common now.
Its real strengths are worth naming plainly:
- Low material cost compared to fiber cement, wood, or metal
- Never needs painting — color is mixed through the panel
- Doesn't rot, and insects don't eat it
- Fast installation, which keeps labor costs down
- Wide availability of colors and profiles at any building supply store
For a lot of climates and a lot of budgets, vinyl is a perfectly reasonable choice. Birch Bay's climate is where the trade-offs start to matter more than they would somewhere drier and calmer.
Why Our Coastline Is a Tougher Test
Birch Bay sits directly on the water, which means salt-laden air is a constant, not an occasional event. Add Whatcom County's long wet season, wind-driven rain off the Strait of Georgia, and the shaded, damp conditions that grow moss on roofs and north-facing walls for much of the year, and you've got a climate that stresses siding in three specific ways: moisture intrusion, UV and salt exposure, and constant thermal cycling from the marine layer. Any siding product has to handle all three at once, year after year, without maintenance turning into a second job for the homeowner.
Where Vinyl Runs Into Trouble Here
Vinyl's biggest structural weakness is that it's a rain-screen product, not a water barrier — it's designed to shed most water while the house wrap behind it handles anything that gets through the seams and laps. That's a fine system on a calm, dry site. On a driving-rain, wind-exposed lot near the water, wind-driven rain can push moisture behind panels more aggressively, and vinyl's loose-hanging installation (it has to hang loose to allow for expansion) isn't sealed at the seams the way some homeowners assume.
Vinyl also softens and becomes brittle at temperature extremes — it can warp in concentrated reflected heat (a known issue near south-facing windows or dark surfaces) and turn brittle and crack-prone in sustained cold snaps. Salt air accelerates fading on lower-grade vinyl, and once the color fades unevenly, there's no fixing it short of replacement — vinyl can't be painted without voiding warranties on most product lines, and paint doesn't bond well to PVC's flexible surface long-term anyway.
None of this means vinyl siding "fails" in Birch Bay. Plenty of vinyl-sided homes here hold up fine for years. Our concern is what happens over a 20-30 year ownership window in a marine environment with this much moss, moisture, and salt — that's the window we're being asked to build for.
What James Hardie Fiber Cement Does Differently
James Hardie siding is fiber cement — a mix of Portland cement, sand, and cellulose fiber pressed into planks, panels, and shingles, then cured. It's a fundamentally different material with different failure modes, and those failure modes happen to line up much better with what this coastline throws at a house.
| Factor | Vinyl Siding | James Hardie Fiber Cement |
|---|---|---|
| Combustibility | Combustible (PVC plastic) | Non-combustible |
| Moisture behavior | Sheds water, relies on WRB behind panels | Engineered to resist moisture absorption and swelling |
| UV/salt fading | Fades over time, cannot be repainted easily | ColorPlus factory finish is baked-on and warranted against fading |
| Thermal movement | Warps in heat, brittle in cold | Dimensionally stable across temperature swings |
| Impact resistance | Cracks and shatters on hard impact | Resists impact damage; won't dent like vinyl or metal |
| Repainting option | Not viable long-term | Can be repainted decades later if desired |
| Typical material cost | Lower | Higher upfront |
Hardie's HZ5 product line is specifically engineered for wet, marine, freeze-adjacent climates — this is not a generic siding formula stretched to cover the Pacific Northwest, it's a version of the product built for regions like ours. That matters when the siding in question is going to sit a few miles from saltwater for the next few decades.
The ColorPlus Finish Difference
A big part of long-term siding failure isn't the substrate — it's the finish. Field-applied paint on any siding material is only as good as the prep, primer, and application conditions on the day it was sprayed, and it's the first thing to fail in a salty, damp environment. James Hardie's ColorPlus finish is applied and cured in a factory under controlled conditions, then backed by its own finish warranty separate from the substrate warranty. That two-layer warranty structure — one covering the board, one covering the color — is part of why we standardized on Hardie rather than unfinished or field-painted alternatives.
The Installation Difference Matters Too
Vinyl's biggest advantage — how fast it goes up — is also part of why we don't install it. Vinyl is largely forgiving of installation shortcuts because it's a floating, overlapping system; a rushed crew can hang it badly and it will often still look fine from the curb for a few years. Fiber cement is not forgiving in the same way. Hardie siding has to be installed to the manufacturer's specifications — correct fastener placement, proper clearances, factory-primed cut edges sealed in the field, and flashing details done right — or the product's own warranty is at risk and its performance drops.
That's not a knock on vinyl installers; it's a difference in the products themselves. We install exclusively to Hardie's published installation specifications because that's the only way the climate-engineered advantages of the product actually show up in the field, especially in a wind-driven-rain environment like Birch Bay.
Cost Over the Life of the House
We won't quote fake numbers, but the honest framing is this: vinyl costs less upfront and Hardie costs more upfront. The question worth asking isn't which is cheaper to install — it's which one you're comfortable owning for 25-30 years on a lot exposed to salt air and driving rain. Repainting isn't realistically on the table for vinyl, so a faded or damaged section usually means a mismatched patch or a full re-side. Hardie's factory finish is warranted for a long service life and can be repainted decades out if you ever want a color change, which keeps a full re-side further out on the horizon.
What to Check Before You Decide
- Ask any contractor which specific Hardie product line (HZ5, HZ10) is rated for your site's wind and moisture exposure
- Ask whether the crew installing your siding is factory-trained on Hardie's fastening and flashing specs, not just experienced with siding in general
- Get the warranty paperwork in writing — substrate warranty and finish warranty are separate documents
- Ask how the contractor handles cut-edge sealing, since exposed raw edges are the most common fiber cement installation mistake
- Compare not just material cost but expected maintenance and repainting timeline over 20+ years
Why We Made the Call We Did
We don't install vinyl, LP SmartSide, or other fiber cement brands, and it's not because those products don't have a place in the market — it's because after years of siding homes in Whatcom County's marine climate, we standardized on one product system we can stand behind fully: James Hardie, installed to spec, every time. That means one set of installation standards to master, one manufacturer warranty structure to explain clearly, and one material that's engineered for exactly the conditions Birch Bay throws at it — salt air, driving rain, and a moss season that doesn't let up.
If you're weighing vinyl against fiber cement for a home near the water, we're happy to walk your specific house — exposure, sun, wind — and give you a straight answer, not a script. Reach out for a free, no-pressure estimate and we'll tell you what we'd actually put on your walls.