Best Deck Materials for Olympia's Climate

(And How to Choose Between Them)

Deck season in Olympia has a rhythm. Most homeowners start thinking about their outdoor space right about the time the sun consistently shows up in June and early July. What most don't think about at that same moment is which material their deck should be built from. Which is unfortunate, because material choice matters more here than almost anywhere else in the country. Pacific Northwest weather is unusually hard on outdoor wood. Persistent moisture, prolonged shade under trees, and moss that starts colonizing anything horizontal within about eighteen months mean the wrong deck material becomes a maintenance headache fast, and the right one lasts thirty years with almost no attention.

After twenty years of building decks in Thurston County, we've installed all the major options and watched how each one holds up. Here's an honest look at what you're actually choosing between, what each will cost you over ten years, and when each option makes the most sense.

The four main options

Every deck in the Olympia area gets built from one of four materials, plus a couple of premium options for higher-end custom homes. Here's what each actually is.

Composite decking is the material category that includes brands like Trex, TimberTech, Fiberon, and Deckorators. The composition varies by brand, but all of them are a blend of recycled wood fiber and polymer plastic, with a cap layer that resists staining and moisture. Composite has become the default choice for most new decks in the past decade because it looks better and lasts longer than it used to.

Cedar is the classic Pacific Northwest wood. Western red cedar in particular has natural oils that resist rot and insects, and it develops that silvery gray patina everyone associates with mature PNW homes. It's beautiful and it's local, which matters if you're building the kind of home where materials should feel like they belong to the region.

Pressure-treated lumber is the budget option. Southern yellow pine or Douglas fir treated with chemicals that resist rot and insects. It's what most contractors will quote if you ask for a basic deck. It's genuinely functional but it looks like what it is.

Hardwoods like ipe, tigerwood, and cumaru are the premium exotic options. Ipe in particular is dense enough to sink in water. It's expensive, incredibly durable, and it develops a rich patina over time. This is the tier we see on custom homes and estate-level outdoor spaces.

What Olympia's climate does to each material

Moisture is the main variable. Olympia averages about 50 inches of rain per year, spread across roughly 160 rainy days. That's not extreme by PNW standards, but it's enough that any wood surface stays wet for weeks at a time during winter. Rot, warping, and cupping happen faster here than they do in drier climates.

Moss and lichen are the second variable. Anything shaded and horizontal in Thurston County will start growing moss within eighteen months. Wood decks require regular cleaning to keep the moss from breaking down the surface. Composite decks resist moss on the surface but can still develop it around fasteners and between boards if not cleaned periodically.

Sun exposure varies wildly. Some Olympia yards get full sun most of the summer. Others sit under a canopy of Douglas fir and stay damp year-round. Material choice should factor in what your deck's actual exposure looks like, not just what deck material you like in general.

Ten-year cost comparison

The sticker price of a deck is only part of what you'll pay. Here's what each material costs to install and then what it costs to maintain over the first decade.

Composite: Higher installation cost, dramatically lower maintenance cost. A quality composite deck runs about 50 to 80 percent more than pressure-treated at install, but the maintenance is essentially zero. Occasional cleaning with soap and water. No staining, no sealing, no board replacements. Over ten years, composite usually comes out ahead of even pressure-treated in total cost of ownership, because pressure-treated needs restaining every two to three years and often has boards replaced along the way.

Cedar: Middle installation cost, moderate maintenance. Expect to reseal or restain every two to three years to preserve the color and slow the graying process. If you're happy with cedar aging naturally to silver gray, you can skip staining and just clean it annually. Cedar tends to last twenty to twenty-five years with reasonable care in our climate.

Pressure-treated: Lowest installation cost, highest ongoing labor. Needs staining or sealing on a two-year cycle at minimum. Boards can warp, split, or cup and need replacement. A pressure-treated deck can last twenty years but only with consistent maintenance. Skip a few staining cycles and it deteriorates fast.

Ipe and hardwoods: Highest installation cost, low maintenance for what you're getting. Ipe can last forty to fifty years with basic cleaning. It doesn't need staining or sealing to last, though many owners apply oil annually to maintain the rich color rather than let it silver. Over a lifetime of ownership, this is often the least expensive option per year, but the upfront cost is real.

When each material makes sense

Choose composite if you want a deck that looks great and stays that way with minimal effort. Best fit for busy families, homeowners who travel, aging-in-place plans, and anyone who wants to enjoy the deck rather than maintain it. Also the safest choice if you're not sure how long you'll stay in the home, since composite holds resale value well.

Choose cedar if you want a natural material that feels like it belongs to the region, and you're willing to do periodic maintenance. Cedar is our recommendation for craftsman-style homes, custom builds, and anywhere the aesthetic matters more than the maintenance schedule.

Choose pressure-treated if budget is the main driver and the deck function is basic. It works, and if you'll maintain it, it will last. Just be honest with yourself about whether you'll actually restain it every two years.

Choose ipe or a premium hardwood if you're building a custom home or premium outdoor space where the deck is a design feature, not just functional square footage. Ipe is what we install on estate-level projects because it lasts, it looks distinctive, and it deserves the price it costs.

Getting started

The right deck material for your project depends on how you'll actually use it, how long you plan to live with it, and how you feel about maintenance. If you're planning a deck for your Olympia home this summer or early fall, we're happy to walk your yard, look at the specific exposure and site conditions, and help you weigh the options in person. The wrong material choice usually shows up around year three or four, when the maintenance reality sets in. The right choice can be a decision you don't think about for the next twenty years.

Contact First Finishers at (360) 400-7767 or visit firstfinishers.com to schedule a walkthrough. Family-owned since 2005. Design-build in Olympia, Yelm, Lacey, Tumwater, Tacoma, and the surrounding South Sound.