Go back to page 5. Second Floor
A Keder roof system was used to protect the the core installation area. This lightweight, temporary roofing system could be slid on rails make space for concrete pours.
The existing roof was deconstructed and all heritage timber salvaged and reused. The exposed NLT was the original floor structure for the planned expansion.
In anticipation of mass timber installation, wood was pre-selected for NLT fabrication and stored in wrapped billets with air circulation.
Prefabricated NLT panels were completed and stored with spacers for air circulation. Plywood and temporary protection membranes (Adhero Visto) were pre-installed on the panels. NLT ends received a liquid sealer (not visible in this photograph).
The concrete perimeter ring beam is the critical junction between old and new structure at the envelope of the building. It serves to transfer the loads from the mass timber above down to concrete columns in the existing levels, avoiding any additional loads on the existing masonry walls.
With the ring beam in place, installation of mass timber commenced at this level. The temporary waterproofing was compromised at the perimeter during this installation.
Installation of perimeter columns and beams.
Mass timber installation progress.
Mass timber installation of Level 4 NLT floor assembly.
Completion of Level 3 mass timber.
Level 3 concrete topping preparation and reinforcing. Visible in the foreground are the DYWIDAG drag struts and couplers. Electrical conduits for all base building services and life safety systems are run in the concrete topping and dropped through the NLT to the floor below for flush installation of electrical boxes. Exterior steel stud and sheathing and glazing frame installation in progress.
Concrete topping pour, completion of installation of frames and glazing.
Progress on the interior side of the envelope.
Remedial sanding of glulam beams to correct water staining.
Detail of the junction between the concrete perimeter ring beam and glulam column. The glulam column sits on an embedded steel connection with grout surround.
The junction between the old and new masonry facades. At the concrete perimeter ring beam, the existing masonry wall had to be rebuilt to achieve a consistent vertical datum due to numerous modifications over time. The portion of the heritage facade outside the ring beam was converted to a cavity wall complete with ventilation and drainage.
Close up detail of the precast concrete band support angle at the floor of Level 4, top of Level 3. The thermal break is visible in green, in line with the sheathing. The wall membrane laps over the break. The bolts were sealed with liquid PMMA. Exposed bolt ends were treated with a protective coating to prevent rust staining.
Installation of masonry piers at the north facade of Level 3. The brick piers are supported by the precast concrete bands. Mineral wool insulation and brick ties are visible at the piers.
Close up of the bird’s mouth corner at the Level 3 masonry facade. Guide lines are strung to keep the corners aligned.
A completed pier installation.