Smooth Shoring

Seattle, Washington

In the heart of the rapidly expanding South Lake neighborhood of Seattle, a 40-story mixed-use high-rise with four levels of underground parking is well under way and on track for a timely completion. The final structure will have 461 residential units, 374 parking stalls, and more than 15,000 square feet of retail space. Malcolm was selected by Holland Partner Group to do the shoring work on this challenging site that is bound by three city streets and an 8-story concrete structure to the north.

Malcolm’s work began prior to demolition of the previous structure–”Ducky’s Building”–when post tensioned soil nails were installed through the 10-inch foundation walls on two separate levels. Once demolished, the foundation design required both the north and south walls be underpinned with 60-foot soldier piles. To the west (alley side) of the site, a total of 66 tie-rods were drilled, each 28 feet in length and drilled from the 970 Denny site through the alley and into a previously cored 9-inch hole inside the adjacent underground parking structure. In addition to the temporary shoring, Malcolm installed six deep water wells 12 inches in diameter, targeting the lower confined aquifer.

The project team encountered several challenges throughout construction, yet managed to beat the contractor’s schedule by several weeks.

For more information, please contact Chase Chappelle at