Xypex Protects 409 and 49 Illinois St. Against High Water Table
San Francisco, USA
April 19, 2009
When the office space called 409 and 499 Illinois St. was planned for San Francisco’s Mission Bay area, it faced considerable waterproofing challenges.
Two six-story towers were to be constructed over a three-level subterranean parking garage that was adjacent to a filled-in turn-of-the-century shipping channel that provided a water infiltration conduit from the bay to the garage. With an especially high water table at 8 feet below grade, the possibility of saltwater attack, and a garage design calling for two parking levels at 30-ft below grade, developers faced a far greater concrete waterproofing and protection issue than normal.
Aware of the reliable performance of Xypex Crystalline Technology in resisting both extreme hydrostatic pressure and saltwater attack, project engineer Simpson Gumpertz & Heger and designer Dowler-Gruman Architects specified Xypex Admix C-1000 NF to waterproof and protect the below-grade slabs and perimeter walls. Cemex, the project’s ready-mix supplier, blended Xypex Admix into the concrete mix at the time of batching and worked closely with Xypex to initiate a 15-hour, problem-free continuous pour of over 8000 cu yd.