A deck in the Willamette Valley lives a hard life: nine months of moisture, moss spores on every breeze, then a summer of direct UV. The composite-versus-cedar debate is usually argued on looks and sticker price, but out here the real question is what you are willing to do every spring for the next twenty years. We build both, we like both, and we have torn out failed versions of both. Here is the field-honest comparison for Tualatin and the rest of the metro, plus the framing and code facts that matter no matter which surface you pick.
1. The comparison that actually decides it
| Factor | Composite (Trex, TimberTech) | Cedar | Pressure-treated fir |
|---|---|---|---|
| Upfront cost tier | High | Mid | Budget |
| Annual upkeep | Wash. That is it. | Wash plus stain or seal every 1 to 3 years | Wash plus stain; expect checking and splinters |
| PNW moisture behavior | No rot; surface mildew washes off | Naturally rot-resistant heartwood, but finish neglect ends badly | Rot-resistant by treatment; movement and cupping are the issue |
| Summer surface heat | Darker boards get hot underfoot | Stays cooler than composite | Moderate |
| Realistic surface life here | 25 to 30+ years, warranty-backed | 15 to 25 years, tracks maintenance discipline | 10 to 20 years |
| Warranty | Manufacturer fade and stain warranties, 25 to 50 years by line | None beyond the lumber grade | Treatment warranty only |
2. What composite gets right, and where it disappoints
Modern capped composites from Trex and TimberTech solved the problems of the early-2000s boards that stained and molded. The polymer cap resists moisture and UV, colors are stable, and the manufacturers publish long fade-and-stain warranties on their upper lines. In our climate the value is blunt: composite decks do not need the annual stain cycle, and in a region where the staining window is a few dry weeks, that is the difference between a deck that looks good in year ten and one that never got its second coat. The honest downsides: higher upfront cost, hotter surface in full sun (pick lighter colors on south exposures), and it is only as good as the frame beneath it, which is still wood.
3. The case for cedar, made honestly
Cedar is beautiful in a way composite still imitates, it is cooler underfoot, it is a regional material, and its heartwood carries genuine natural rot resistance. The catch is the contract you sign with yourself: wash and re-finish on a one-to-three-year cycle, forever. Maintained cedar decks in the metro reach twenty-plus years looking wonderful. Neglected ones go gray, check, grow moss in the grain, and get slippery, and by year twelve the owner is calling a deck contractor about replacement. If you know yourself to be the person who will stain the deck, cedar rewards you. If you are not, buy the material that forgives you.
4. Frames, footings, and Oregon code: where decks actually fail
Deck surfaces get the attention; deck failures happen underneath. In Oregon, deck construction falls under the Oregon Residential Specialty Code, and the provisions that matter are the ones written in response to real collapses: proper footings sized to soil and load, a ledger attached to the house with lags or structural screws and flashed against water (nailed-only ledgers are the classic collapse), joist hangers and hardware rated for exterior use, guards on decks more than 30 inches above grade, and graspable stair rails. Permits are required for most new decks and structural rebuilds in metro jurisdictions, with limited exceptions for very low, small, freestanding platforms; check your city before assuming. When we rebuild a deck surface, we open the frame and check the ledger first, because that is the component that hurts people.
5. Our recommendation by owner, not by material
- Keep-forever family deck, low appetite for upkeep: capped composite on a pressure-treated frame with stainless or coated hardware.
- Craftsman house, owner who enjoys the ritual: cedar, finished the first season and on schedule after.
- Rental or budget rebuild: pressure-treated surface now, framed so composite boards can replace it later without touching the structure.
- Any deck older than 15 years: structural check before spending on boards; the money may belong in the frame.
If a new deck or a deck rebuild is on your list, would it help to know whether your existing frame is worth building on before you price materials? We do free deck inspections in Tualatin and across the metro, ledger to footings, with a written report within 24 hours. We also sequence decks with larger exterior projects when it saves mobilization.
One more variable people forget until July: how the deck will actually be used. A deck that hosts a hot tub needs engineering for point loads no matter what the surface is. A south-facing deck used barefoot by kids pushes toward cedar or a light composite color. A shaded north-side deck under firs will fight moss on any material and should be detailed with wider board gaps for drainage and airflow. Bring the use case to the design conversation, not just the material question, because half the failed decks we replace were built right for the wrong life.
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