Decking · Mixed

How a composite deck ages in Dallas, TX

THE SHORT ANSWER

In Dallas, sun is the main stress on a composite deck: UV ranks #12 of 25 cities we cover and there are about 108 days above 90 °F. Capped boards lighten noticeably in the first two years, then stabilize; dark colors also get hot underfoot. Model estimate: 23–30 years of service.

Main threat
Sun & UV
Climate profile
Mixed
Expected life
23–30 yrs
Wash
Spring & fall
Rainy days / yr
82
Days ≥ 90 °F
108
Simulated composite deck in Dallas, TX after 10 years
Year 10Color has lightened, then stabilizes
MODEL SIMULATION
Dallas, TX · capped composite boards, south-facing, full sun
Color lossHigh
Surface wearModerate
Mildew / rotModerate
Fails first hereColor on full-sun boards

Storyboard

20 years in Dallas, washed yearly

Composite deck in Dallas, install: Install day
InstallInstall day
Composite deck in Dallas, year 1: Slight early fade
Year 1Slight early fade
Composite deck in Dallas, year 3: Slight early fade
Year 3Slight early fade
Composite deck in Dallas, year 5: Color has lightened, then stabilizes
Year 5Color has lightened, then stabilizes
Composite deck in Dallas, year 10: Color has lightened, then stabilizes
Year 10Color has lightened, then stabilizes
Composite deck in Dallas, year 15: Color has lightened, then stabilizes
Year 15Color has lightened, then stabilizes
Composite deck in Dallas, year 20: Color has lightened, then stabilizes
Year 20Color has lightened, then stabilizes

Dallas’s wear fingerprint

Each bar is scaled to the highest of the 25 cities we cover; the black line marks the median.

Rainy days / yr82.2 · Low
Avg humidity69.2% · Low
Decay index47.4 · Typical
UV index (avg)1.4 · Typical
Freeze–thaw days21.8 · Typical
Days ≥ 90 °F107.6 · High

NOAA station DALLAS FAA AP (USW00013960, 7.3 km away), 1991–2020 normals · humidity & UV: NASA POWER.

What fails first here

  1. 1Heat underfootAbout 108 days a year top 90 °F; dark composite can get uncomfortably hot in full sun. Lighter colors help.
  2. 2Early color fadeCapped boards lighten in the first 1–2 years, then level off. Stronger here than average: UV rank #12 of 25.
  3. 3Surface mildewComposite does not rot, but pollen and dirt on shaded boards feed mildew. A wash in spring and fall prevents it.
  4. 4Gaps & fastenersBoards expand and contract with temperature; check hidden clips and end gaps every few years.

Upkeep

Dallas maintenance calendar

Built from local normals: bar width is the share of days with rain; composite mainly needs washing.

Jan
Feb
MarWash & check for mildew
Apr
May
Jun
Jul
Aug
Sep
OctWash, clear gaps
Nov
Dec

Same city, other materials

How the alternatives age in Dallas

Cedar deck in Dallas at year 10 (simulation)
Cedar deck
Expected life here: 15–19 yrs · main threat: sun & uv
See it age in Dallas →
Wood fence in Dallas at year 10 (simulation)
Wood fence
Expected life here: 14–18 yrs · main threat: sun & uv
See it age in Dallas →

Pin-ready

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The 20-year storyboard as a tall pin, linking back to this page.

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Pinterest storyboard: composite deck in Dallas, TX, new to year 20

Composite decks in similar climates

Austin, TXHouston, TXNew Orleans, LAAtlanta, GATampa, FL

…and in very different ones

Buffalo, NYSeattle, WADenver, COAll 25 cities →

Questions Dallas owners ask

How long does a composite deck last in Dallas?

Our model puts a capped composite deck at 23–30 years in Dallas, close to typical warranty terms. The boards outlast the look: expect some early fading and surface mildew in shade.

How often should you clean a composite deck in Dallas?

Twice a year — in spring and fall. Dirt and pollen are the main thing to wash off.

Is composite worth it over cedar in Dallas?

In Dallas our model gives untreated cedar 15–19 years and composite 23–30. The gap is smaller where rot is slow, so upkeep preference decides.

Why does wood turn white or pale in Dallas?

UV breaks down lignin at the surface; rain and wind wash the loose fibers away, leaving a bleached, silvery layer. It is cosmetic until checks open up.

Model simulation, not a guarantee: south-facing, full sun, no shade or ground-contact surprises. How it works.