Project Spotlight: 100 & 200 Oracle Parkway, Redwood Shores, CA
When roofs on two of its Redword Shores, CA, office buildings reached the end of their service life, Oracle called in D. C. Taylor Co. The 100 and 200 Oracle Parkway buildings had EPDM roofs with rock ballast and pavers; one is eight stories, the other 12. Having worked with professionals out of the roofing contractor’s Concord, CA, office in the past, Oracle felt confident that D. C. Taylor Co. would provide another safe, quality roofing project. Work commenced in May 2017 and lasted until late August.
The project totaled 40,000 square feet (each building measuring 20,000 square feet). On average, D. C. Taylor Co. worked with a 10-man crew. Each building’s roof has two levels (lower and upper). The lower was rectangular and the upper roof, a cylinder. “Everything on this project was pre-planned and executed as planned. There was no room for delays, mistakes, or negligence,” says Raymundo Jimenez, Service/Construction Manager and Safety Technician, D. C. Taylor Co., Concord, CA.
The project took place while the buildings were occupied. The entire project needed to be done with minimum disturbance to the tenants.
Tear-off of the existing roof involved removing two-inch gravel rock ballast by crane on metal boxes, about one ton at a time. The ballast was deposit into the metal boxes by hand. The 12- by 12-inch concrete pavers were also removed along with the rest of the EPDM roof system. For safety reasons, the crane could not be operated while the building was occupied, limiting hoisting to the weekends. The existing roof was removed and stored (along with generated debris) until weekend crane events.
On the rectangular part of the roof, 60-mil Sika Sarnafil feltback membrane was adhered (totaling 27,000 square feet between the two buildings). This presented a challenge, due to the wind and the size of the single-ply membrane sheet on a multi-story building.
For the cylinders on both buildings, 13,000 square feet of Sika Sarnafil S327 60-mil bareback membrane was installed with a layer of DensDeck® roof board mechanically attached over top.
Where the rectangular roof meets with the cylinder the roof gets very narrow (down to four inches), requiring crew to use suspended scaffolding (what window washers use) to roof out of; this proved to be both a creative solution and unique roofing situation.
To protect the new roofing system from the usage of swing-stage window cleaning equipment, walkway pad was installed on both the flat part and cylinder of each building. This created a protection layer for the window cleaning equipment and an attractive design at the roof perimeter.
Fall safety was everyone’s number one concern. Due to the absence of parapet walls on the roof, temporary guard rails were installed on the entire perimeter of both roofs. Plastic nets were install on the guard rail to stop debris from flying off the roof. Crew performed perimeter work using 100-percent fall protection, being tied off to the building’s permanent horizontal lifeline. There was not one incident on this project.
“We always have clean trucks and clean uniforms. There were no complaints about employees. The customer commented that our crew behaved extremely well,” says Jimenez. High-quality workmanship was exhibited, and the project passed the city and manufacturer inspections without a punch list. The project even earned third place in the low slope-reroofing category of Sika Sarnafil’s 2017 Project of the Year competition.