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The presenters will offer a case study of a wellness building in Iowa that, during its first winter, had icicles on the roof eaves, and interior water leakage during its first spring. . A repair was performed that included replacing the existing insulation and vapor barrier with new SPF as a thermal and air barrier. Whole-building air testing was used before and after repairs to prove the improvement in air-tightness. Bruce Kaskel has expertise in exterior wall systems related to glass, glazing, water infiltration, corrosion, structural adequacy, energy performance, anchorage devices, and durability. His projects include aluminum and glass curtainwalls, masonry, exterior windows and doors, and precast concrete and stone panels. Kaskel has provided exterior wall consulting services during design and construction of new buildings, including serving as a building envelope commissioning agent (BECx). Jennifer Schneider has been involved with numerous projects related to the inspection, investigation, and repair of distressed conditions in existing buildings. Her experience also includes building enclosure commissioning (BECx) and peer design review for new construction, applying her experience in modes of leakage, condensation, and distress to proposed detailing. Schneider applies thermal and hygrothermal modeling to her evaluations of exterior wall systems. Read More

Many air and water resistive barriers are adhesively installed on substrates. Organizations have required a minimum value when conducting on-site pull testing. Many question the number and wonder where the number comes from. There is a lot of discussion on what the loads are for a location and height of a building. Others say that the value has to do with proper installation of the materials. This presentation will cover the origins of the minimum value that is currently being used, how this value relates to installed properties, and what is the purpose for the minimum value. The presentation will also provide the results of a research project that was done to see what actual site values of pull adhesion are, based on material, substrate and other conditions. Mr. Laverne Dalgleish is the Executive Director of the Air Barrier Association of America (ABAA). As such, he works to champion energy conservation in buildings while educating the building owners and designers about the benefits of energy conservation such as durability, comfort, reduced maintenance, reduced HVAC equipment costs and the positive impact on the environment. Mr. Dalgleish travels North America on a weekly basis to educate building owners and designers on the benefits of effective and working air barrier systems in buildings. This education mission includes working with standards development organizations, training and education groups, government policy departments, and quality assurance program developers for the construction industry. Mr. Dalgleish is the Secretariat of two ISO Committees, ISO TC61 SC10 Cellular Plastics and ISO TC163 SC3 Thermal Insulation Products. He is also Chair of the ULC Thermal Performance in the Building Environment Standards Committee. Read More

Presenter: Allen Lyte, RRO W. Allen Partners, Inc., Aurora, ON Roofing membranes within a roof assembly are generally the only barrier to keep the elements out. Standard building cladding design recognizes that well-performing walls consist of layers of materials (zones) to resist wind, heat, rain, etc., to achieve the rain screen principle in wall cladding. This dual-barrier design can be applied to roofs. Protected membrane roof (PMR) assemblies can have superior performance over conventional roofs since the moisture-resistant insulation protects the primary roofing membrane from the environment. Dual-barrier design can be implemented to help reduce negative effects of water diffusing into the insulation or reducing the thermal performance by flowing underneath. Typical PMRs can be easily upgraded by the placement of a properly selected vapour-permeable drainage layer above the insulation. Read More

Presenters: Scott Armstrong, BSSO, CET, LEED AP BD+C,WSP Canada, Toronto, ON Jean-Guy Levaque, FRCI, RRC, RRO, GRP, WSP Canada, Hamilton, ON Global climate trends are clear: more extreme weather events, frequent and more intense rain events, and widely variable ambient temperatures. How do current building envelope design practices and retrofit strategies respond and how do we embed this future thinking into our projects? Building Envelope Commissioning can provide the framework to facilitate conversations about ever-more-stringent standards, processes, codes, and performance requirements related to the building envelope. It also provides a process to ensure performance is embedded in project requirements and is delivered at each stage through construction completion. This session uses project examples that demonstrate the application of commissioning principles on new construction, existing buildings, or individual enclosure elements – from below grade to the roof and beyond. Discussion takes place for typical design-, tender-, and construction-phase practices that track and test enclosure performance while keeping project teams informed of how value engineering, change management, or substitutions may affect performance. Lastly, connections are created and compares project examples to common industry guidelines and standards such as LEED v4, LEED EBOM, BOMA BEST, NIBS, ASHRAE, CSA, and ASTM to highlight the need for industry standardization. Read More

Buildings rely on many different systems and materials to provide a continuous enclosure including roofing, cladding, windows, and below-grade waterproofing. Individually, enclosure systems are generally well understood. However, transitions between two or more systems are less straightforward. Transition details are unique to each project. The design often includes some transition concepts, but may not consider constructability issues such as sequencing. Construction often includes carefully detailed system shop drawings that lack details of adjacent systems manufactured and installed “by others.” Construction has added challenges including such as tolerances and sequencing. Ultimately, many transition details are left to the discretion and experience of the installers. The design and construction of reliable transition details requires an understanding of enclosure concepts and careful coordination among all involved parties. Coordinated details must consider enclosure continuity, compatibility between materials, constructability, warranty implications, installation sequence, and other issues. The authors will discuss continuity of the building enclosure and present strategies for designing and constructing coordinated transition details based on our combined experience. Topics will include: material selection and compatibility, constructability review, coordination among trades, and addressing the inevitable challenges of construction. We will work through several case studies to illustrate successful development of difficult transition details. Nicholas Piteo is a Senior Project Manager in the Building Technology division of Simpson Gumpertz & Heger’s Washington, DC office. He has experience on both building technology and structural projects. His experience includes investigation of existing structures and building enclosures, rehabilitation design, and new design encompassing a variety of materials and systems including below-grade waterproofing, windows, curtain walls, metals, sealants, masonry, wood, stone, concrete, and other materials related to building-envelope construction. Mr. Piteo spends the majority of his work life analyzing issues with the building enclosure and developing solutions as part of new design consulting and investigation project. Emily Wychock is a Senior Staff I in the Building Technology division of Simpson Gumpertz & Heger’s Washington DC office. She works on projects involving new design, field investigation work, and repairs to building enclosure systems. She has consulted with architects, contractors, and building owners on commercial and residential buildings. Read More

This hospital Owner in the mid-Atlantic region experienced complete roof failure within five years of installation. Components within the roofing assembly had debonded, warped, twisted, cupped, and distorted causing the roof no longer drain properly and left the Owner fearful that large portions of the roof would fail and blow off in a storm event. During the course of the evaluation thermography, roof cores, moisture meters, document review, and visual inspection techniques were used to demonstrate a number of defects in not only the design of the building but in the installation of various roofing components. The installing contractor had claimed that the building’s mechanical system was solely responsible for pressurizing and damaging the roofing materials to the point of failure. The Owner had claimed that there must have been a number of defects in the installation of the roofing system which caused the system failure. During the course of the forensic evaluation it was demonstrated that the mechanical system was not responsible for the failure of the roofing system; however it was determined that defects in the design and construction of other building components such as the structural steel heliport, the roofing air/vapor barrier and roofing components contributed to total system failure. These findings coupled with significant workmanship issues led to the premature failure of the roofing system. Mr. Mills graduated with a Bachelor of Science degree in Engineering from Brooklyn Polytechnic Institute of New York in 1983. He has been a resident of the Tidewater, Virginia area for 20 years. He is a licensed Professional Engineer in Virginia, North Carolina, and South Carolina. Mr. Mills founded TAM Consultants, a professional services firm in 2002 specializing in providing solutions for the constructed environment including Building Enclosure Consulting, Property Inspections, Property Damage Surveys, Property Defect Surveys, Structural and Forensic Engineering and Design, Project Management and Owner Agent Services. Prior to forming TAM Consultants, Mr. Mills had experience with a number of multi-disciplined design and inspection firms and served in the role of designer, inspector, project manager, technical specialist, commercial roofing specialist, asbestos and lead specialist, construction manager, general contractor and owner’s project representative. Mr. Mills’ 30+ years of experience cover a wide range of public and private projects of varying types and sizes. Project types include commercial, single and multi-family residential, historical, light and medium duty industrial and manufacturing facilities, warehouse and distribution, parks and recreation, waste-water, fire stations, laboratory, parking, “green buildings,” retirement, and medical and hospital facilities. Read More

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