Floor Refinishing in Burlingame

Burlingame Conditions That Affect Floor Refinishing

Derived statistic, not a published normal: averaging NOAA Local Climatological Data hourly observations at San Francisco International Airport across the ten Julys 2015-2024 (Local Standard Time) gives 83.5% relative humidity at 04:00 (n=690) and 61.3% at 16:00 (n=627) — a daily swing of about 22 points. NOAA's published table gives Sacramento a July afternoon mean of 29%.

San Francisco International Airport records 1991-2020 January normals of 58.0°F average high and 44.5°F average low, with an annual precipitation normal of 19.6 inches. Cold, damp conditions do the reverse and stretch cure times, which mostly costs patience — a floor that is walkable is not yet a floor that is ready for furniture or rugs.

Burlingame sits on the bay side of the northern peninsula. San Francisco International Airport normals at a July high of 72.6°F — between San Francisco Downtown at 66.3°F and Redwood City at 81.0°F further south. Cool, damp days in Burlingame lengthen finish cure times compared with a hot, dry one — a scheduling factor rather than a quality one.

Seasonal Gaps in Burlingame Floors, by the Numbers

Seasonal gaps between boards are a common reason people ask about refinishing, and Burlingame's measured climate shows how much of that gapping is simply the wood moving with the seasons. Measured at San Francisco International Airport, then brought to 70°F, the air averages 42.3% relative humidity over the heating season and 54.8% over summer, which settles wood at roughly 8% and 10% moisture content. For a traditional 2¼-inch oak strip floor that is about 0.017 inch of seasonal shrinkage per board (about 1/59 inch); for 5-inch plank, about 0.038 inch. Gaps in that range that open in winter and close by summer should not be filled — filler packed into a winter gap gets crushed out, or pushes the boards toward cupping, once the wood takes its moisture back.

Source: Hourly ASOS dewpoint observations 2015–2025, Iowa Environmental Mesonet (Iowa State University); equilibrium moisture content from USDA Wood Handbook FPL-GTR-190 Eq. 4-5; movement from FPL-GTR-282 Eq. 13-3 and Table 13-5

What's Under the Finish

Burlingame's ZIP 94010 appears on CRMP's 2025 Earthquake Brace + Bolt eligibility list. The California Residential Mitigation Program states that 'an EBB seismic retrofit is only done on wood-framed, pre-1980 homes with a raised foundation,' targeting cripple walls in crawl spaces beneath the structure. 29.6% of Burlingame's 13,798 housing units were built in 1939 or earlier and 79.3% predate 1980. Even so, EBB ZIP eligibility is set on seismic hazard and housing age rather than foundation type, and no measured raised-versus-slab share for Burlingame was found, so the age figures indicate likelihood rather than proportion and no share is claimed.

Raised floors are where the best refinishing candidates live: solid wood over a crawlspace, often with decades of wear and plenty of thickness left. It is also where cupping comes from. Sanding a cupped floor flat before the crawlspace moisture is fixed produces a floor that goes concave the other way once it dries — so the moisture reading comes first and the sanding comes second.

Source: NAHB analysis of the Census Bureau Survey of Construction, foundation type by region (2024)

Burlingame Homes We Work In

ACS 2020-2024 five-year estimates count 13,798 housing units, of which 29.6% (4,086 units) were built in 1939 or earlier. A further 11.3% date to the 1940s, 13.6% to the 1950s and 12.9% to the 1960s. Only 10.4% was built in 2000 or later. Burlingame's pre-1940 stock is where refinishing pays off most: homes of that period often have original wood under carpet, and when the wear layer is intact, refinishing keeps a floor that cannot be bought new. We check thickness at a vent or a doorway before recommending it.