Glendale built out substantially between the 1920s and the 1940s, which puts a large share of its laterals in the cast iron and early vitrified clay era. Those pipes are now eighty to a hundred years old. Cast iron from that period fails by accumulating scale and corrosion on the inside wall until the bore has closed to a fraction of its original diameter, and the symptom is a house where everything drains slowly and gets slowly worse, with temporary improvement after each cabling.
The city sits against the Verdugo Mountains, and the terrain divides the work. The flats toward the Los Angeles River are on alluvial ground washed out of the Verdugos and the San Gabriels, granular and relatively stable, so joints are pulled apart less by soil movement than they are in the clay basins. The foothill and hillside neighbourhoods rising toward the Verdugo crest are a different matter: sloping lots, deeper laterals, longer runs and slope creep that shears a rigid pipe across its section rather than parting it at a joint.
Depth is the practical consequence on the hillside properties. A lateral running from a house part way up a slope down to a street main at a different elevation sits well below grade, and the deeper a defect is the larger the excavation to reach it. We locate with a sonde and quote a depth before any repair is discussed, because the same crack at three feet and at nine feet are different jobs with different prices.
The older streets carry substantial mature tree cover, and where early clay joints have opened those roots are the usual cause of an outright blockage.
Around Glendale
We regularly work near:
- 📍Brand Library and Art Center
- 📍Deukmejian Wilderness Park
- 📍The Americana at Brand
- 📍Verdugo Park
Main Sewer Line Cleaning in Glendale — Local Notes
- •Heavy 1920s to 1940s build-out puts many laterals in the cast iron and early clay era
- •Flats toward the river sit on granular alluvial ground, so less shrink-swell joint separation than the clay basins
- •Verdugo foothill and hillside neighbourhoods have deeper runs and slope creep that shears rather than separates pipe
- •Defect depth on hillside lots strongly affects excavation size and cost
- •Mature street trees in the older neighbourhoods exploit opened clay joints