Sudden Valley Vinyl siding is the most common siding material sold in the country, and there's a reason for that: it's inexpensive, it goes up fast, and for a lot of climates it does an adequate job for a while. We get asked about it regularly, and we think homeowners deserve a straight answer about why we don't install it, rather than a sales pitch for whatever we do sell. Here's our honest reasoning.
What vinyl siding actually gets right
Vinyl isn't a bad product in the sense of being poorly engineered. It's a thin PVC panel designed to be light, cheap to manufacture, and quick to hang. It doesn't rot, it doesn't need painting, and on a starter home or a rental property where the goal is minimum cost and minimum maintenance, it does what it's supposed to do. If your only criteria were upfront price and installation speed, vinyl would win.
Where it struggles in a climate like ours
Sudden Valley sits on Lake Whatcom in a corner of Washington that gets a genuine mix of weather stress: salt-laden air moving in off the Puget Sound and Georgia Strait, long stretches of driving rain through fall and winter, and a moss and mildew season that can run most of the year on shaded, north-facing walls. Vinyl siding has a few specific weaknesses that show up under exactly these conditions:
- It's a rain-screen, not a rain barrier. Vinyl panels are installed loosely by design, with weep holes and overlaps that let water get behind the panel intentionally. That's fine as long as the water management behind it — housewrap, flashing, seams — is done perfectly and stays that way for decades. Any gap in that system, and moisture sits against the wall sheathing where nobody can see it.
- Salt air accelerates fading and brittleness. Vinyl's color is mixed into the plastic itself, and UV plus salt exposure breaks down that pigment and the material over time. Panels that started as a rich color often fade unevenly, especially on the sun-facing side of a home, and older vinyl gets noticeably more brittle and prone to cracking in a hard frost or a wind-driven branch strike.
- Moss and mildew cling to the surface texture. The wood-grain stamping on most vinyl panels gives algae and moss something to grab onto, and on shaded walls near mature trees — common throughout Whatcom County — that means a visible green or black cast within a few years without regular washing.
- It moves a lot with temperature swings. Vinyl expands and contracts more than fiber cement or wood. Installed even slightly wrong — too tight, nailed too snug — it buckles, waves, or pops off the wall in a windstorm. This is one of the most common vinyl failures we see, and it's almost always an installation issue rather than a materials one, which tells you how unforgiving the product is of small mistakes.
- It can't be repaired invisibly. Because color fades and manufacturers change their product lines, replacing a cracked or storm-damaged panel five or ten years in often means a visible color mismatch, even when you can still find a matching profile.
Why we don't put it on
None of that means every vinyl installation fails. Plenty of homes wear it fine for years. But we build our business on installing one product system correctly, warrantying it, and standing behind it — and vinyl's performance depends heavily on a perfect installation and a forgiving climate, neither of which we're willing to bet a customer's investment on here. Between the lake-effect moisture, the salt air moving up from the sound, and the moss pressure on shaded lots, we've made the call that it's not the product we want representing our work.
What we install instead
We install James Hardie fiber cement siding exclusively. It's a genuinely different material — a mix of cement, sand, and cellulose fibers pressed into planks — and it addresses the specific problems above directly:
| Concern | How Hardie addresses it |
|---|---|
| Moisture behind the wall | Rigid, dimensionally stable panels install tight with proper flashing, without relying on loose overlap joints |
| Salt air and UV fading | ColorPlus factory finish is baked on and warranted separately against fading and chipping |
| Moss and algae | Smoother, denser surface than vinyl's wood-grain texture, and it holds up to regular washing without degrading |
| Temperature movement | Minimal expansion and contraction compared to vinyl, so it doesn't buckle or pop loose |
| Fire exposure | Non-combustible, which matters given the wildfire smoke and dry-summer risk the region has seen in recent years |
Hardie also builds specific product lines engineered for different climate zones, and we install the HZ5 line suited to the Pacific Northwest's wet-cold profile. It costs more than vinyl upfront, and it takes longer to install correctly because it has to be cut, fastened, and finished to a real spec — but that's the trade we think is worth making on a home in this climate, not a rental spec sheet.
The honest bottom line
Vinyl siding isn't a scam or a defective product — it's a budget product doing a budget product's job, and in a drier, more sheltered climate it can hold up reasonably well. In Sudden Valley, with salt air, sustained rain, and moss pressure all working against it year-round, we don't think it's the right long-term investment for a homeowner who wants to do this once. That's why we standardized on Hardie fiber cement and don't offer vinyl as an option.
If you're weighing siding materials for a home in Sudden Valley or elsewhere in Whatcom County, we're happy to walk your specific house, look at your sun and shade exposure, and give you a free, no-pressure estimate — no obligation, just a straight assessment of what your home needs.