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Client:  City of Seattle, Seattle Public Utilities

Completed: ongoing

Synopsis:  The existing construction has failed and is allowing infiltration of water into the building envelope. With the high moisture environment of the “bridge” over a man-made stream, our team was cognizant of the fact that all work must be environmentally friendly to protect the wildlife in the stream. This project will include complete skinning of exterior and interior finishes including windows and roofing to expose the framing. The envelope will then be reconstructed with new materials to provide a viable and weatherproof enclosure. 

Client:  City of Seattle

Size: 7,200 sf

Completed: 2019

Synopsis:  Roof replacement with a multiple ply system that included a modified bitumen base sheet and PVC cap-sheet. 

Client:  City of Seattle

Size: 2,700 sf

Completed: 2019

Synopsis:  Replacement of the existing roof system with a multiple ply system that included a bituminous base sheet and PVC cap-sheet.

Client:  Western Washington University

Size: Phase 1, Stacks 3 and 4 & Community Building

Completed: 2018

Synopsis:  Following the recommendations of the building envelope study conducted in 2016/2017, the siding of all stacks was scheduled for replacement. Our team determined to maintain the general aesthetic of the existing while upgrading and modernizing the exterior envelope. We designed the removal of existing siding and moisture barrier and the installation of an air barrier, exterior insulation and new cement board siding. 

Client:  Port of Seattle

Size: 90,000 sf

Completed: 2018

Synopsis:  Our team provided a report of preliminary investigation that included multiple roof cuts to verify the existing roof system and mitigate change conditions during construction. For this continuously operating facility a roof overlay was determined to be a prudent and cost-effective solution—including a roof coverboard and an 80 mil heavy-duty membrane with an expected life of 30 years. Additionally, CAG designed replacement of 20,000 sf of translucent skylights and windows to upgrade light transmission into the concourse area. 

Client:  Port of Seattle

Size: 87,000 sf

Completed: 2017

Synopsis:  CAG provided a comprehensive roof replacement including insulation upgrades and fall protection along with a 30-year roof system for four separate roof areas comprised of modified bitumen sheets with a single-ply cap-sheet all set into hot asphalt. In addition, 25 HVAC units were replaced. 

Client:  Washington State Department of Enterprise Services

Size: 10,000 sf (8,000 sf bituminous wp; 2,000 sf PMMA wp)

Completed: 2017

Synopsis:  Cornerstone was brought in to complete design of the waterproofing (wp) replacement project at a high-traffic plaza in downtown Tacoma. Scope of work for this intricate, highly visible project involved replacement of all 4’x4’ concrete pavers over a high millage bituminous waterproofing at the plaza-deck area. Finished PMMA liquid applied waterproofing was used at the amphitheater to provide protection to exposed concrete and the occupied space below.

Client: USPS 

Size: 10,000 sf façade, 62 double-hung wood-sash windows

Completed: 2015

Synopsis:  Beginning with a building envelope condition assessment report outlining the various deficiencies throughout the building, CAG liaised with the Washington State Department of Archaeology and Historic Preservation in the decision to refurbish the existing wood windows and to repair the brick facades. 

Client:  Port of Seattle

Size: 32,000 sf

Completed: 2014

Synopsis:  CAG's team was commissioned to provide roof replacement design for the headquarters of the Port of Seattle. The roof system was based on a three-ply modified bitumen roof with a granulated cap-sheet over concrete and metal deck substrates—and designed and detailed to last a minimum of 25 years. Included in the project scope was the replacement of 8 saw-tooth gutters with PMMA liquid-applied roofing.