24H Mold Inspection of Lakeside

John Ferry's thousand acres were sold and cut into the Lakeside Farms tract in 1909, west of the original 1886 townsite laid out around Lindo Lake, the only natural lake in San Diego County. The Lakeside Farms school followed in 1956, and the blocks around it fill the gap between those two eras: raised-foundation farmhouses with vented crawl spaces sitting beside postwar slab tracts. The two behave differently in the same wet winter. A crawl space over ground that has been flood-irrigated for a century holds standing water and rot in the subfloor with nothing showing indoors, while a slab pushes that same ground moisture straight up through the flooring above it.

Between Channel Road and Riverford Road, roughly a hundred acres of river bottom were sand-mined and then filled with about 600,000 cubic yards of imported material to build pads for industrial buildings. That is the operative fact for anything standing there: slab on fill over a floodplain with a shallow water table, where concrete stays cold and damp long after the surface looks dry. The buildings are big-span metal and tilt-up under low-slope roofs drained by a handful of interior drains, so a blocked drain spreads water sideways above a ceiling instead of dripping in one obvious place. Wash bays and evaporative coolers add a moisture load no house carries.

The lots north of the valley floor are large, hilly, and mostly outside the sewer, so households run on septic tanks and leach fields set into decomposed granite and fractured rock. Granite does not absorb evenly. Effluent and irrigation water follow seams through the rock and surface downslope, often against a neighbor's cut pad rather than the parcel it started on. Houses are stepped into those cuts with a wall or two partly below grade, and the low side takes seepage first. Well-served properties add a second variable: a pressure tank or supply line weeping under a house for months, because there is no meter reading to make anyone notice the loss.

The Helix Irrigation District closed Chet Harritt Dam across Quail Canyon in 1962, filling what became Lake Jennings, a 200-foot earthen dam holding roughly 9,790 acre-feet and the reason this ridge developed when it did. Most housing here dates from that decade forward, on pads cut into the canyon rim above the water. Cold air drains into the canyon overnight and pools against the lake, so the lake-facing side of a house sits in damp air and fog for hours after sunrise while the road side has already dried. Shaded crawl vents, north walls, and the lower floor of a stepped house are where that difference turns up in a moisture reading.

Winter Gardens got its own school in 1964, at the end of the tract-building run that filled these blocks with slab-on-grade three-bedroom houses. Nearly all of them were cooled the way inland East County cooled itself before central air: a roof or wall-mounted evaporative cooler that works by pushing damp air through the house and out an open window. Those units are the recurring find here. An abandoned one leaves an unsealed penetration above a ceiling, one still running with the windows closed drives humidity into the framing all summer, and either way the supply line to the pad keeps feeding water when the float valve sticks.