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: NBC 2015 Subsection 5.9.3 Other Fenestration Assemblies - The Intent Behind the New Code Provisions

By Morrison Hershfield|Nov 3, 2017 6:10:44 PM

In Canada, the design, construction and installation of glazing systems has been partially regulated through standards and building Codes for decades.

CCBST 2017: A Compartmentalization & Ventilation System Retrofit Strategy for High-Rise Residential Buildings in Cold Climates

By Morrison Hershfield|Nov 3, 2017 5:42:18 PM

This research proposes an alternative rehabilitation strategy for aging high-rise multi-unit residential buildings (MURBs) involving suite compartmentalization and decentralizing the ventilation system.

CCBST 2017: Insulated Metal Panels - Design and Construction Challenges

By Morrison Hershfield|Nov 3, 2017 5:18:19 PM

Exterior insulated assemblies are growing in popularity due to changing code requirements with regards to thermal resistance for opaque wall assemblies.

CCBST 2017: A Case History Review of ETFE on Today's Current Projects

By Morrison Hershfield|Nov 3, 2017 2:50:18 PM

ETFE, the fluorocarbon-based polymer ethylene tetrafluoroethylene, is quickly gaining popularity in North America with it’s use 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.

CCBST 2017: Design Limits for Framed Wall Assemblies Dependent on Material Choices for Sheathing Membranes and Exterior Insulation

By Morrison Hershfield|Nov 3, 2017 2:12:09 PM

There are many opinions in industry with regard to appropriate material choices for sheathing membranes and exterior insulation of framed wall assemblies. Opinions vary on what is sensible for the vapour permance of materials outboard of the framing so that not only will wetting and drying will be in harmony, but other interests such as costs, wall thickness, and energy efficiency targets can be met.

CCBST 2017: Fenestration Systems - It's All About the Plumbing!

By Morrison Hershfield|Nov 3, 2017 2:00:06 PM

 A few years ago the Toronto office of our engineering firm experienced what we termed “the year of the crappy curtain wall”. In actuality it was more like eighteen months, and during that period we investigated persistent water penetration in several low- to mid-rise commercial office buildings ranging in age from 5 to 20 years old.

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. 

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.

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