Decking · Hot & humid

How a composite deck ages in Tampa, FL

THE SHORT ANSWER

In Tampa, sun is the main stress on a composite deck: UV ranks #4 of 25 cities we cover and there are about 94 days above 90 °F. Capped boards lighten noticeably in the first two years, then stabilize; dark colors also get hot underfoot. Model estimate: 22–29 years of service.

Main threat
Sun & UV
Climate profile
Hot & humid
Expected life
22–29 yrs
Wash
Spring & fall
Rainy days / yr
108
Days ≥ 90 °F
94
Simulated composite deck in Tampa, FL after 10 years
Year 10Surface mildew in shaded areas
MODEL SIMULATION
Tampa, FL · capped composite boards, south-facing, full sun
Color lossHigh
Surface wearModerate
Mildew / rotHigh
Fails first hereColor on full-sun boards

Storyboard

20 years in Tampa, washed yearly

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

Tampa’s wear fingerprint

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

Rainy days / yr108.2 · Typical
Avg humidity77.7% · Typical
Decay index103.6 · High
UV index (avg)1.6 · High
Freeze–thaw days0.7 · Low
Days ≥ 90 °F94.2 · High

NOAA station TAMPA INTL AP (USW00012842, 8 km away), 1991–2020 normals · humidity & UV: NASA POWER.

What fails first here

  1. 1Surface mildewComposite does not rot, but pollen and dirt on shaded boards feed mildew — common in Tampa’s damp climate. A wash in spring and fall prevents it.
  2. 2Early color fadeCapped boards lighten in the first 1–2 years, then level off. Stronger here than average: UV rank #4 of 25.
  3. 3Heat underfootAbout 94 days a year top 90 °F; dark composite can get uncomfortably hot in full sun. Lighter colors help.
  4. 4Gaps & fastenersBoards expand and contract with temperature; check hidden clips and end gaps every few years.

Upkeep

Tampa 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 Tampa

Cedar deck in Tampa at year 10 (simulation)
Cedar deck
Expected life here: 10–13 yrs · main threat: moisture & decay
See it age in Tampa →
Wood fence in Tampa at year 10 (simulation)
Wood fence
Expected life here: 10–13 yrs · main threat: moisture & decay
See it age in Tampa →

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 Tampa, FL, new to year 20

Composite decks in similar climates

Miami, FLNew Orleans, LAHouston, TXMobile, ALAustin, TX

…and in very different ones

Denver, COLas Vegas, NVBuffalo, NYAll 25 cities →

Questions Tampa owners ask

How long does a composite deck last in Tampa?

Our model puts a capped composite deck at 22–29 years in Tampa, 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 Tampa?

Twice a year — in spring and fall. Tampa’s damp climate makes mildew on shaded boards the most common complaint.

Is composite worth it over cedar in Tampa?

In Tampa our model gives untreated cedar 10–13 years and composite 22–29. The gap is smaller where rot is slow, so upkeep preference decides.

Why does wood turn white or pale in Tampa?

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.