Morrison Hershfield

Morrison Hershfield is a market leading, employee-owned engineering firm committed to making a difference in our communities. We are anchored by exceptional technical expertise and high performing employees across North America. Our highly focused approach to the clients and markets we serve ensures that we deliver the value our clients demand.
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Recent Posts

CCBST 2017: Quantifying the Benefit of Venting Glazed Spandrels to Reduce Glass Breakage and Control Moisture

By Morrison Hershfield|Nov 3, 2017 1:14:44 PM

While venting glazed spandrels is cited to be a benefit to control heat buildup, several instances of spontaneous glass breakage in spandrel insulated glazing units, attributed to thermal stress, have been reported in vented spandrel cavities used with an opacifier on the inside glass surface.

CCBST 2017: Lessons Learned from Lab Testing Failures

By Morrison Hershfield|Nov 3, 2017 12:57:58 PM

Curtain walls and window walls are typically specified to meet a variety of different performance and testing criteria, some of which can be quite stringent. 

Economic Viability of Supplemental Piping

By Morrison Hershfield|Jun 9, 2017 11:01:00 AM
The volume of distribution piping for chilled water in data centers is typically designed to be minimized while maintaining the redundancy necessary to ensure uptime during maintenance or failure events; individual piping designs vary greatly, but they must maintain the ability to fulfill mission critical requirements. Often, it seems logical to assume that the simplest arrangement of piping may be best to meet design requirements, but from an economic standpoint, this decision is not always sound. This paper discusses 1) how capital cost may be optimized by examining various system piping configurations and 2) demonstrates how CCG investigates the economics of designing for fewer larger pipes vs a greater number of smaller pipes.

Guiding Design Teams by Hygrothermal, Energy, and Thermal Comfort Analysis while Managing Uncertainty

By Morrison Hershfield|Dec 13, 2016 1:17:25 PM

Ideally moisture analysis of buildings is based on statistical analysis where the probability of failure, loads and design parameters are stochastic variables, similar to limit state design for structural engineering.  However, many industry professionals and standards, such as ASHRAE Standard 160 acknowledge that sufficient information is rarely available to make a full statistical analysis practical. 

Canadian Window Wall: Design challenges and opportunities

By Morrison Hershfield|Dec 1, 2016 1:00:00 PM

One of the defining characteristics of new high-rise residential apartment building design in Canada today is the thermally broken, open-back aluminum frame ‘window wall’ building envelope system. Until recently, Canadian building codes and Canadian and North American fenestration standards have not recognized window wall as a distinct cladding system.

Upgrading the Performance of Heritage Windows

By Morrison Hershfield|Nov 8, 2016 12:37:38 PM

100 Wellington Street was constructed in Ottawa, Ontario, Canada circa 1931 as the United States Embassy, and was occupied until 1997 when ownership was transferred to the Canadian Government.  The Canadian Government was looking to repurpose this heritage-designated building to public “art gallery” quality space, capitalizing on its prominent location on the Ceremonial Route across from Parliament Hill.

A Case History Review of ETFE on Today's Current Projects

By Morrison Hershfield|Oct 24, 2016 12:47:20 PM

ETFE, the fluorocarbon-based polymer ethylene tetrafluoroethylene, is quickly gaining popularity in North America and being used on some of the continent’s most prominent projects. ETFE was developed for architectural purposes in the 1970s, and since that time, mainstream use of ETFE in construction projects has been largely limited to Europe.

Impact of Design Considerations on the Renewal of Landscaped Podiums

By Morrison Hershfield|Oct 21, 2016 2:09:06 PM

The Landscaped Podium

As part of a building’s exterior element, landscaped podiums or waterproofed plaza decks provide an aesthetically pleasing common space for the enjoyment of their users. In addition to providing much needed green spaces on concrete structures, podiums that incorporate large softscape areas aid in the building’s water management strategy by retaining and slowly releasing storm water during a heavy rain event.

The Reality of Quantifying Curtain Wall Spandrel Thermal Performance: 2D, 3D and Hotbox Testing

By Morrison Hershfield|Jan 1, 2016 1:00:00 PM

Curtain wall assemblies, large expanses of aluminum framing, are not traditionally known for their thermal efficiency. While insulated spandrels within the curtain wall framing have been used in an attempt to improve the thermal performance of the curtain wall system, research and testing has shown that typical insulated backpan systems fall short of expectations for the thermal resistance of opaque walls in many codes and standards.

Highly Insulated, Ventilated, Wood-Framed Attics in Cool Marine Climates

By Morrison Hershfield|Jan 1, 2016 1:00:00 PM

Attic ventilation is a firmly established requirement for residential wood-framed buildings. Attic ventilation is cited to be a benefit for moisture control, reducing cooling loads in hot climates, minimizing ice dams in cold climates, and extending the service life of roof materials by reducing surface temperatures. There is an ongoing debate on the real significance of some of these benefits and mandatory venting requirements. 

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