Part of ourCalifornia Climate GuideSan Francisco

Fire & Coast

Hardwood Decking in San Francisco

How Ipe, Cumaru, Tigerwood, Garapa, Massaranduba & Red Balau perform in San Francisco's fire & coast climate.

Summer High

85-110°F

Winter Low

35-55°F

Annual Rainfall

10-65"

Humidity

Low-High (varies)

UV Index

High-Extreme

Primary Challenge

Wildfire Zones + Coastal Salt + Desert Heat

San Francisco Climate & Decking Challenges

San Francisco's famous fog creates constant moisture exposure similar to the Pacific Northwest, while coastal salt air requires 316 stainless fasteners. Hardwood's natural slip resistance is a major safety advantage on fog-wet SF decks.

Building a Deck in San Francisco: Local Conditions

Summer / Winter

70°F / 46°F

Annual rain

23"

Elevation

52 ft

Salt exposure

bay

San Francisco runs from roughly 46°F in winter to 70°F in summer, with about 23" of rain a year and moderate humidity. Salt air is a permanent condition here, not a seasonal one. San Francisco's fog keeps decks damp for long stretches without ever raining, which favors species with natural mold resistance.

What those numbers mean for your boards

Salt-bearing air off the water reaches most of the buildable area.
Active subterranean termite pressure — a standing argument against softwood framing at grade.

San Francisco spec sheet

Acclimation on site

7 days

Board gap

5/32" gaps — the middle setting, appropriate for this city's moderate seasonal moisture swing.

Fasteners

316 stainless strongly recommended. Salt carries inland here, and 304 stainless is only acceptable well back from the water.

Best install window

Nearly year-round. This city has no season that actively works against a hardwood install.

Species Rankings for San Francisco

BEST OVERALL

Ipe Decking in San Francisco

Ipe is the premium choice for California — Class A fire-rated for WUI zones, naturally resistant to coastal salt and extreme UV, and stable across CA's temperature range from mountain cold to desert heat. Ipe's proven track record in demanding CA applications makes it the architect's go-to specification.

Lifespan: Up to 75+ yearsOiling: 1x/year (coastal); 1-2x (inland)

BEST VALUE

Cumaru Decking in San Francisco

Cumaru delivers Class A fire performance at 30-40% less than Ipe — making it the best-value fire-code-compliant option in California. Its 3,330 Janka hardness handles coastal, desert, and mountain CA climates equally well. Perfect for budget-conscious CA homeowners who need WUI compliance.

Lifespan: Up to 50+ yearsOiling: 1-2x/year

HEAVY DUTY

Massaranduba Decking in San Francisco

Massaranduba's Class A fire rating and extreme density make it an excellent CA choice. Particularly strong for Southern CA's intense UV and Inland Empire heat. Its deep reddish-brown color complements both modern and Mediterranean California architecture.

Lifespan: Up to 50+ yearsOiling: 1-2x/year

VISUAL APPEAL

Tigerwood Decking in San Francisco

Tigerwood's dramatic striped grain is a natural fit for California's design-forward culture. Class A fire rated for WUI compliance. The bold color pattern stands out beautifully against California's outdoor living spaces.

Lifespan: Up to 40+ yearsOiling: 1-2x/year

WARM TONE

Red Balau Decking in San Francisco

Red Balau is Class A fire rated and performs well in California's coastal and moderate-climate zones. A solid mid-range option with warm red-brown tones that work with CA's outdoor aesthetic.

Lifespan: Up to 40+ yearsOiling: 1-2x/year

BEST BUDGET + FIRE CODE

Garapa Decking in San Francisco

Here's the California game-changer: Garapa is Class A fire rated AND the most affordable species. For CA homeowners who need WUI compliance but have a budget, Garapa provides real hardwood beauty and fire code compliance at the lowest price point. Best in coastal and moderate inland CA climates where extreme heat isn't a daily factor.

Lifespan: Up to 30+ yearsOiling: 2x/year

Installation Adjustments for San Francisco

Acclimation

10-14 days (varies hugely by CA microclimate — longer in dry inland, shorter on foggy coast)

Board Spacing

1/4" gaps inland and desert; 3/16" on humid coast. Mountain installations: 1/4" to account for freeze-thaw expansion.

Fasteners

316 stainless for coastal (within 5 miles of ocean); 304 acceptable inland

Best Installation Timing

Coastal: year-round. Inland/desert: avoid July-August. Mountain: May-October.

Special Considerations

WUI zone compliance: verify with local building department that hardwood meets their specific Class A requirements. End-seal all cuts. For mountain CA installations, follow Colorado-type acclimation and spacing protocols.

San Francisco Maintenance Calendar

Spring

Full cleaning. Oil application for inland/desert installations. Inspect for any wildfire ember damage if applicable.

Summer

Spot maintenance. Coast: check for salt residue buildup. Desert: avoid oiling in extreme heat.

Fall

Pre-winter prep for mountain CA. Second oil application if needed. Clear debris from fire safety perspective.

Winter

Coast: light cleaning. Mountain: snow removal as needed — hardwood handles freeze-thaw well. Desert: ideal maintenance window.

Oiling Frequency for San Francisco

Varies by microclimate: Coastal fog = 1x/year. Inland UV = 2x/year. Mountain = 1x/year (less UV at elevation offset by more weather).

Hardwood vs. Alternatives in San Francisco

Feature	Ipe Hardwood	Domestic Redwood	Trex Composite	Pressure-Treated
Fire Rating	Class A (all 6 species)	Class B-C	Varies by product	Not fire-rated
WUI Code Compliance	Yes — all species	Often no	Check specific product	No
Lifespan in CA	Up to 75+ years	15-20 years	15-25 years	8-12 years
Coastal Salt Performance	Excellent	Poor	Good	Poor (corrodes fasteners)
UV Resistance	Excellent	Poor — grays fast	Moderate (fades)	Moderate
Cost vs Redwood	Similar per SF	1x (baseline)	1.2-2x	0.3-0.5x (but 3 replacements)
Availability	In stock nationwide	Limited, expensive	Widely available	Widely available

Shop San Francisco Decking by Species

Find the right hardwood decking for San Francisco's fire & coast climate — browse sizes, profiles, and live pricing.

Ipe Decking