Floor Refinishing in Danville

Danville Conditions That Affect Floor Refinishing

Danville sits at about 456 feet in Contra Costa County. No humidity-recording station sits in Danville. The nearest, Livermore Municipal Airport 11.8 miles south, averages 34.0% relative humidity at 4 PM and 79.2% at 4 AM across the ten Julys 2015-2024 — a daily swing of roughly 51 points, against 27 points at bay-side Oakland International Airport.

Danville lies inland of the East Bay hills in the San Ramon Valley. No NOAA station in Danville carries 1991-2020 normals; the nearest stations with normals record July average highs of 88.0°F at Concord Buchanan Field to the north and 71.6°F at the Oakland Museum station on the bay side of the hills. Marine air around Danville lengthens finish cure times relative to a hot inland day — a scheduling factor rather than a quality one.

What's Under the Finish

Danville sits on some of the most expansive ground in this service area, and unusually, it sits on a lot of different kinds of it. USDA-NRCS SSURGO maps twenty-seven soil units inside the town limits. Diablo clay is the most extensive at 37.1% of the area across its slope phases, with a linear extensibility of 10.5% — comfortably inside the highest of the four NRCS shrink-swell classes. Alo clay adds 17.7%, Clear Lake clay 9.6% and Los Osos clay loam 8.4%. Taken together 78.4% of Danville is mapped on soils rated high or very high for shrink-swell, and 53.6% is very high. What distinguishes Danville from its neighbours is that this is spread thin: no single map unit covers more than 17.9% of the town, and eleven of the twenty-five rated units cross into the high class. That combination — strongly expansive ground, finely divided — argues against treating any town-wide rule of thumb as sufficient. Slab flatness and any existing cracking should be assessed on the lot, and the season in which a floor was measured matters, because ground that changes length by a tenth over a wet-to-dry cycle does not present the same substrate in March and September.

A slab affects what can be refinished at all. Wood over concrete is usually engineered or glued-down, and an engineered floor can only be sanded if its wear layer is thick enough to survive it — some can take a full sanding, many can take one light pass, and some cannot be sanded at all. We measure the wear layer before quoting rather than after starting.

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)

Danville Homes We Work In

ACS 2020-2024 five-year estimates count 16,004 housing units, dominated by two cohorts: 29.9% built 1970-1979 and 27.1% built 1990-1999, with 16.2% in the 1980s and 11.4% in the 1960s. 84.6% of the stock was built between 1960 and 1999. Only 0.4% predates 1940. Danville's 1960s, 1970s, 1980s, and 1990s 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.