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This webinar will discuss select rated roofs and edge metal systems as well as establish roof zone layouts based on prescriptive and performance methods. A discussion of the new code requirements and compliance tools regarding ASCE 7-16 will also be covered. Learners will be able to immediately put their learning into practice, as they will be placed on a project team to work through a wind uplift design.   Speaker(s) Information: Kristen Westover and Jennifer Keegan, AIA | GAF Materials Corp. Kristin Westover is a technical manager of specialty installations for low-slope commercial roofing systems at GAF. She has experience with a wide variety of projects in the civil engineering consulting industry specializing in repair and restoration of existing buildings, primarily for commercial buildings and high-rise residential structures. Project expertise includes roofing, waterproofing, facades, parking garages, and pavements. She has performed assessments, written specification, and design documents, provided bidding services oversight, and performed construction contract administration. She also has experience in arbitration and litigation support as well as LEED O+M certification for existing buildings. Jennifer Keegan is the director of building & roofing science for GAF, focusing on overall roof system design and performance. She has more than 20 years of experience as a building enclosure consultant specializing in assessment, design, and remediation of building enclosure systems. She provides technical leadership within the industry as the chair of the ASTM D08.22 Roofing and Waterproofing Subcommittee, and the education chair for IIBEC; and as an advocate for women within the industry as an executive board member of National Women in Roofing and a board member of Women in Construction. 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

Background: Architectural design and sensitivity to skyline views and noise concerns for penthouse unit occupants impacted the original design of the cooling system on a high-rise, leading to placement of the cooling towers in the basements of the east and west wings. Eleven-story air shafts facilitated the cooling tower exhaust, as well as the parking garage ventilation. Organic growth and saturated drywall were observed, giving rise to an investigation. Evaluation: A fire-rated shaft assembly was determined to be woefully inadequate in reconciling the vapor drive and water management issues associated with the extremely high humidity and the temperature differentials across the enclosure. Physical configuration and a lack of thought led to systemic water and air leakage through the enclosure wall. Full shaft wall replacement was required. Design: WUFI® analysis was used to validate the design concept using an exterior insulation approach, coupled with a redundant vapor barrier system. Further complicating the design were extreme vapor pressure differentials and flow reversals, as well as structural issues related to concrete deterioration and post-tensioned concrete pocket protection. Design provisions also included data logging, and a tattletale system to monitor for bulk water infiltration was designed into the enclosure system. Kipp Gaynor has over 33 years of experience in the design and evaluation of new and existing buildings, with concentration in the evaluation and remediation of existing building problems such as deterioration of structural components and exterior wall system failures. His past projects have included commercial, large-scale residential, institutional, and governmental structures with a wide array of structural problems, including structural deterioration, foundation settlement problems, and moisture intrusion issues. Gaynor has extensive experience with a variety of repair projects. He received his B.S. in civil engineering technology from Pennsylvania State University in 1984, and is a member of ASCE, ICRI, CSI, CAI, NRCA, ACI, IIBEC, DCMA, and AAMA. Read More

An enclosure that is appropriately responsive to its environmental loading conditions is one of the most fundamental measures of satisfactory performance for the built environment. Some loads are directly experienced by enclosure components and materials themselves, while other loads are experienced because material deformations or deflections influence those components and materials. While the relationship between structural movement and a structure’s usefulness to its intended purpose has been well understood throughout the history of design and construction, that understanding has not always translated well into satisfactory enclosure performance. Drawing on experiences in post-construction forensic investigations, troubleshooting during construction, and efforts to influence design detailing, this presentation will discuss key factors in applying engineering mechanics for the benefit (or detriment) of enclosure performance. Specific aspects to be shared will include the cross-party dynamics in design and construction that give rise to current challenges, case studies of failures as a result of insufficient consideration, and areas for improvement across the design and construction industry. Jonathan Porter, PE, AAIA Kraus-Anderson Construction Company | Minneapolis, MN Jon Porter is the director of building science for Kraus-Anderson Construction (KA). In his role at KA, Porter focuses on building performance, particularly the exterior enclosure and interior finishes. He serves as a technical resource to project teams in relation to means and methods, constructability, building materials technology, workflow and sequencing, proper installation techniques, and testing and acceptance protocols. A licensed professional engineer in the state on MN, Porter has more than 24 years of design and construction experience, including roles in forensic investigation of design and construction failures and as an owner’s representative. 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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