Engineered Hardwood in El Macero

El Macero Conditions That Affect Engineered 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.

What El Macero's Humidity Asks of Engineered Hardwood

In El Macero the case for engineered hardwood rests more on plank width and slab than on climate, and the measurements show why. Hourly dewpoint readings from University Airport, Davis, 6 miles away, put that air at a median 37.4% relative humidity once it is heated to 70°F over winter — 24% of those hours under NWFA's 30% minimum — rising to 56% in summer. A solid 5-inch white oak board living through that, at roughly 7.3% to 10.3% equilibrium moisture content, changes width by about 0.056 inch between seasons. A cross-laminated core exists to restrain that movement; how much it restrains depends on the product's construction, so we go by the manufacturer's stated humidity range for the specific floor rather than a general rule.

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.

A slab is the single biggest reason engineered hardwood gets specified at all. A dimensionally stable core can go over concrete where solid wood cannot — floated, or glued down with a moisture-control membrane. That is not a free pass: we still test the slab per ASTM F2170, still grind or fill it flat to the manufacturer's tolerance, and still match the adhesive system to the reading we get. Skipping the test is how a glue-down floor comes loose.

Over a crawlspace, engineered goes down by nail, staple, glue, or float, so the method follows the subfloor rather than the other way round. We flatten the subfloor first — engineered plank is stiff, and it bridges dips instead of following them, which is what produces hollow spots underfoot.

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. In El Macero's 1960s, 1970s, and 1980s housing, engineered often wins on height as much as on moisture: a thinner assembly clears existing door jambs, appliance toe-kicks, and the transitions to rooms that aren't being redone, which matters when only part of the house is getting new floor.