Hardwood Flooring in El Macero

El Macero Conditions That Affect Solid Hardwood

El Macero sits at about 36 feet in Yolo County. The regional Sacramento Valley record shows summer air cycling widely within each day rather than staying uniformly dry. In the National Weather Service publication "Climate of Sacramento, California" (revised August 2010), average relative humidity at Sacramento is 78 percent at 4 AM against 30 percent at 4 PM in July, a swing of roughly 48 points inside the same day. Those are Sacramento readings taken about 12 miles from El Macero, not local measurements.

Measured Humidity and Solid Wood Movement in El Macero

University Airport, Davis, 6 miles from El Macero and at about the same elevation, supplied the 62,832 hourly dewpoint readings, 2015 to 2025, behind these figures. Warm that winter air to 70°F without adding moisture and it settles at a median 37.4% relative humidity, with 24% of heating-season hours below the 30% floor NWFA sets for wood floors; the same air reaches 56% in summer. Solid hardwood follows those numbers: its equilibrium moisture content runs from about 7.3% in the heating season to 10.3% in summer, and on the Forest Products Laboratory's coefficients for American white oak that swing changes the width of a 5-inch plainsawn board by about 0.056 inch (about 1/18 inch) — against 0.029 inch for the same board quartersawn. That is inside the range solid wood is specified for, but without much margin, so in El Macero board width and cut get decided before species does.

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

Subfloor and Foundation Work

El Macero is the most uniform ground in this service area by a wide margin. USDA-NRCS SSURGO maps only four soil units inside the CDP boundary, and one of them — Sycamore silt loam, drained — covers 90.1% of it. That unit has a linear extensibility of 2.9%, which places it in the lowest of the four NRCS shrink-swell classes, and no unit anywhere in El Macero exceeds 4.6%. Nothing here is even rated high, let alone very high. Two details are worth carrying into a job. The map units are all mapped on 0 percent slopes and the dominant one carries the "drained" phase, which marks a soil whose natural wetness has been artificially lowered; low-lying basin ground of that kind is flat to begin with but its moisture regime is managed rather than natural, so crawl space and slab moisture readings deserve attention even though the shrink-swell risk is low. The second is the coincidence with the housing data: 86.4% of El Macero's homes were built across three consecutive decades and 90.1% of its ground is a single soil, which makes this one of the few communities where what is found under one floor is a reasonable guide to the next.

On a slab, solid hardwood is the least forgiving floor there is: it cannot be nailed into concrete, and it responds to vapor drive from below more sharply than anything else we install. Where we're going over slab we test the concrete for moisture first — an in-situ relative humidity test per ASTM F2170 rather than a guess — and where the readings rule out solid wood, we say so and price engineered instead of hoping for the best.

Over a crawlspace, solid hardwood is in its element — plank or plywood subfloors take fasteners well — but only when the crawlspace itself is dry. We check the ground cover, look for standing water and rot at the joist ends, and read the moisture content of the subfloor from below. Cupping in a solid floor is almost always a crawlspace problem that surfaced upstairs.

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

El Macero Homes We Work In

ACS 2020-2024 five-year estimates count 360 housing units, 86.4% of which were built between 1960 and 1989 — 31.7% in 1970-1979, 28.6% in 1960-1969, and 26.1% in 1980-1989. The sample records no units built before 1960. This matches the community's origin as a planned golf-course development: the clubhouse, course, and first 175 lots came to market in spring 1961. El Macero's 1960s, 1970s, and 1980s stock is directly relevant here, because homes of that period frequently have a board or plywood subfloor that will hold a nail-down installation, and sometimes original wood still under the carpet. We check for both before quoting a full replacement — refinishing what's already there is often the better answer.