Decking · Hot & humid
How long does a pressure-treated deck last in Houston, TX?
In Houston, sun does most of the damage. UV here ranks #11 of 25 cities we cover, with about 101 days a year above 90 °F. Unsealed boards bleach to a pale silver and open up surface checks; the preservative keeps rot in check even at a decay index of 84.5, so checking, splitting and warping usually end the boards’ life first. Model estimate: 10–13 years unsealed, 13–17 years sealed on schedule.
Storyboard
20 years in Houston, unsealed
Houston’s wear fingerprint
Each bar is scaled to the highest of the 25 cities we cover; the black line marks the median.
NOAA station HOUSTON WILLIAM P HOBBY AP (USW00012918, 15.3 km away), 1991–2020 normals · humidity & UV: NASA POWER.
What fails first here
- 1Checks, splits and warpingStrong UV (rank #11 of 25) dries and shrinks the surface faster than the core, opening fine cracks.
- 2Mildew & algaeFrequent rain and 77% average humidity keep shaded boards damp; dark spots start near walls, planters and gaps.
- 3Rot at board ends & joistsThe real lifespan limiter in Houston: decay index 84.5. Treatment protects the wood, but cut ends and drilled holes lose it — brush end-cut preservative on during building.
- 4GrayingCosmetic, and fast: our model has the surface fully silver by year 2. Not damage on its own, but it means the protective surface is gone.
Upkeep
Houston maintenance calendar
Built from local normals: bar width is the share of days with rain; sealant needs 2–3 dry days between 50 and 88 °F.
Same city, other materials
How the alternatives age in Houston
Pin-ready
Save it for when you build.
The 20-year storyboard as a tall pin, linking back to this page.
Pressure-treated decks in similar climates
New Orleans, LA
Tampa, FL
Miami, FL
Mobile, AL
Austin, TX…and in very different ones
Denver, CO
Albuquerque, NM
Las Vegas, NVQuestions Houston owners ask
How long does a pressure-treated deck last in Houston?
Our model puts it at 10–13 years unsealed and 13–17 years if it is sealed every 2–3 years. The national typical range is 10–15 yrs; Houston’s sun and UV profile is why the local number differs.
When is the best time to seal a pressure-treated deck in Houston?
May and October: the months with the fewest rainy days while average temperatures sit between 50 and 88 °F. Most sealants need 2–3 dry days to cure.
Cedar or pressure-treated: which lasts longer in Houston?
Our model gives an unsealed pressure-treated deck 10–13 years here and untreated cedar 12–15 years. Treated pine resists rot better than cedar in damp climates, but it checks, splits and warps more, so surface wear usually decides when boards get replaced.
Why does wood turn white or pale in Houston?
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.