This Canadian Multi-family Apartment was Rehabilitated to be More Efficient

By ROCKWOOL. 

The Ken Soble Tower project goal was to completely upgrade a post-war apartment to achieve Passive House standard, reducing greenhouse gas emissions by an impressive 94%. 

The Ken Soble Tower is exemplary of the way that low-energy retrofits are revolutionizing how we think about upgrading our buildings. Both green and cost-effective, this building retrofit helps reduce carbon in urban areas, proving that it is possible to improve upon an existing building while adding in the many benefits that come with eco-friendly buildings. 

The goal 

Built in 1967 at 18 stories and 80,000 square feet, the Ken Soble Tower had been in a state of deterioration for some time as the oldest high-rise multi-residential building in CityHousing Hamilton’s portfolio. 

The goal was to retrofit the building to achieve EnerPHit certification, a branch of the Passive House (PassivHaus) standard designed specifically for retrofits. The building overhaul would include nearly every facet of the building from the building envelope, mechanical systems, electrical, plumbing and safety systems to interior upgrades to its 146 units to support aging in place, accessibility, comfort and overall improvement of the occupant experience. As public housing, cost was a key consideration, and the team set out to complete the retrofit at a fraction of the cost of a new build. 

The challenge 

The current building had significant challenges including a deteriorating envelope, lack of insulation, inadequate ventilation, and lack of thermal controls. While ERA Architects was originally going to re-clad the building with an entire wall assembly outside the existing brick, a visit to the ROCKWOOL booth at the Construct Canada exhibition changed everything. 

The solution 

After introducing the architect to the DuROCK PUCCS NC EIFS system incorporating ROCKWOOL stone wool insulation, the entire plan for the building envelope was revised. The resulting cladding design includes a six-inch thick stone wool EIFS system. ERA Architects liked three main things about the system: first, and most obviously, the non-combustibility (important given the vulnerability of the senior-aged occupants); second, the excellent moisture control offered by the stone wool and the unique, built-in drainage layer cut into the back side of the insulation; and third, the liquid applied water resistive barrier (LAWRB). 

In all, 50,000 square feet of ROCKWOOL stone wool insulation was incorporated into the new façade, helping to realize the R-38 effective R-value required to achieve EnerPHIT certification. The EIFS system fit the need for cost effectiveness (the system helped reduce labor costs), ease of install, high-quality composition, a favorable sustainability profile as well the top-notch technical support, provided by ROCKWOOL and DuROCK. 

The upgraded building envelope with inorganic stone wool will also help contribute to better air quality, since mold was previously an issue. Additionally, it created a more resilient building, able to stand up to harsher conditions as a result of climate change in the region, effectively future-proofing the building and better protecting its senior residents. In fact, thanks in part to its tight and super-insulated building envelope, ERA Architects notes that Ken Soble Tower “demonstrates passive resilience to extreme conditions: In case of failure of active systems, the building will stay warm in winter for up to two days (compared to two hours in a typical building) and below dangerous heat levels in summer for up to four days (compared to half a day in a typical building).” 

Overall, Ken Soble Tower will now provide residents with improved comfort and control of their indoor environments while substantially reducing energy demand. At its peak, the total energy needed to heat or cool each unit will be equal to the energy needed to run three incandescent light bulbs (100W). The retrofit now positions Ken Soble Tower as a true asset as well as a proud and prominent landmark in Hamilton’s waterfront — fitting, as it now stands as one of the world’s largest EnerPHit certified projects. 

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Original article source: ROCKWOOL