79 King: Head and Tail
Spiritos believes that Northampton is a “development positive town”, but stresses that residents also want to ensure that everything that gets built downtown fits its established aesthetic character. “They've got guidelines in zoning that are supportive, and they want buildings that are respectful of Northampton’s history, but also progressive,” he says.
To preserve downtown’s historic character, developers are required to go before Northampton’s Architecture Review Board, submit a plan, and get their approval before being issued permits. Plans must adhere to a design guide that, according to David Kubik, partner at the New York City-based BKSK Architects and the architect for the project, is very specific and can sometimes be somewhat tricky to navigate. This is especially the case when building performance takes such a high priority.
One of the guidelines that posed a significant design challenge for the team was the restriction on grilles or louvers on street-facing facades. Kubik explains, “When doing a Passive House building, it’s really helpful if you can have the ERV [energy recovery ventilator] intake and exhaust directly at the unit and to have some small grilles populate your façade.”
As this wasn’t possible on the side of the building facing the street, the team decided to split the one-over-four building into two four-story towers atop a shared podium. For the street-facing side, which Kubik refers to as “the head building”, the team developed a more centralized system for the heating, cooling, and ventilation where everything is brought up to the roof. For the side that does not face the street, “the tail building”, Kubik says that a centralized system will be used in the hallways and public spaces, while each apartment will be outfitted with a unit manufactured by Ephoca that will provide ventilation, heating, and cooling. As there are no design restrictions on façade penetrations for this side of the building, each system’s ductwork, including intake and exhaust openings, can be localized entirely within the unit.
The cladding systems for the head and tail buildings will be notably different, as well. The tail façade will consist of cement-board cladding supported by a wood batten system. The façade of the street-facing head building, however, must comply with design guidelines for the city and replicate the historic masonry seen elsewhere throughout downtown. To capture this aesthetic, the team will rely on the Corium brick cladding system manufactured by Interra.
According to the project’s Passive House consultant, Michael Hindle, principal of Passive to Positive, the roof assemblies for both the head and the tail buildings will each have R-values of 53 and include 7 inches of cross-laminated timber (CLT) slab material and another 7 inches of polyiso. Hindle hopes the polyiso can be reclaimed from another project.
In addition to being home to mechanicals from the centralized ERV system, as well as a Sanden heat pump water heater system that will service the entire building, approximately half of the 20,000-square-foot roof will contain a PV array that is expected to generate 121.2 MWh annually. The other half of the roof space will include amenities like benches, tables, and small herb or vegetable gardens for residents.
Materials Matter
Though there are significant differences in the mechanical and cladding systems, the bones of the two sections of the building will be constructed using similar materials. Both will consist of glulam columns and beams—engineered laminated wood beams—with CLT floors and exterior wall panels. “When you’re in your final apartment, other than some drop ceilings over kitchens and bathrooms, you’re going to be looking at the underside of the wood CLT panels, as well as the exterior,” Kubik says. “It has a real effect on what you experience when you’re in that apartment.”