Luxury Vinyl Plank in Cupertino

Cupertino Conditions That Affect Luxury Vinyl Plank

Derived statistic, not a published normal: averaging NOAA Local Climatological Data hourly observations at San Jose International Airport across the ten Julys 2015-2024 (Local Standard Time) gives 82.1% relative humidity at 04:00 (n=392) and 49.3% at 16:00 (n=317). San Francisco International averages 61.3% at 16:00 by the same method. The figure describes the station, not the city. NOAA's published table gives Sacramento a July afternoon mean of 29%.

NOAA's San Jose airport station records 1991-2020 January normals of 59.8°F average high and 41.8°F average low, with an annual precipitation normal of 13.5 inches. Cold does the opposite — a floor that was installed tight in summer heat can pull apart at the seams once the house cools. Correct gapping at the perimeter is what makes that a non-event.

NOAA's San Jose airport station normals at a July high of 80.8°F against 66.3°F at San Francisco Downtown. Outdoor humidity in Cupertino, high or low, is a non-issue for the plank's stability; it's the subfloor underneath that we still check.

Subfloor Prep

The Eichler Design Handbook — Fairgrove (January 16, 2001) states that 'the Fairgrove neighborhood consists of a group of 220 Eichler homes built in the early 1960's,' bounded by Phil Lane, Tantau Avenue, Bollinger Road and Miller Avenue. The handbook describes Eichler homes as characterized by 'single stories with mostly low pitched or flat roofs, multiple indoor/outdoor patios or atriums, slab foundations, and extensive glass,' with 'technological innovation such as radiant-heat floors.' Fairgrove was rezoned 'R1e - Single Family Eichler' following a citywide architectural survey, so the boundary is a zoning line and can be checked against a parcel. It is a single tract, not a citywide condition. Citywide, 63.8% of housing predates 1980. No source publishes a citywide slab-versus-raised share.

Over a crawlspace the plank is still waterproof, but "waterproof floor" is not "waterproof house" — moisture coming up through an open crawlspace ends up in the subfloor and the framing regardless of what's on top. We look underneath first. Where the subfloor has soft spots or movement, it gets fixed before anything floats over it.

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

Cupertino Homes We Work In

ACS 2020-2024 five-year estimates count 22,158 housing units; 26.9% (5,959 units) were built in the 1960s, the largest decade. Another 20.1% date to the 1970s and 14.2% to the 1950s. Only 1.3% predate 1940. Cupertino's 1960s, 1970s, and 1950s homes are where LVP most often replaces carpet or sheet vinyl, and the subfloor under both is frequently uneven in ways nobody has seen for decades. The prep — not the plank — is the majority of the work in those houses, and it is the part that gets skipped by whoever installed the floor you're now replacing.