Making Transitions: Keeping Air and Water Barriers Continuous

Integrated sheathing solutions help streamline detailing and installation
Sponsored by Georgia-Pacific Gypsum
Peter J. Arsenault, FAIA, NCARB, LEED AP

Learning Objectives:

  1. Identify the role that building construction transitions play (roof to wall, wall to foundation, and wall to disparate materials) in achieving a well-designed building envelope, including conditions that contribute to failure.
  2. Recognize the points in the design process where construction transitions need to be addressed and specific areas that required detailed attention.
  3. Review the conditions that promote movement of bulk water, moisture, or vapor drive and how those conditions impact construction transitions, specifically at roof-to-wall, wall-to-foundation, and wall-to-disparate-material locations.
  4. Describe the importance of maintaining the continuity of water-resistive barriers and air barriers across construction transitions, and assess integrated sheathing products and systems as a means to achieve that continuity.

Credits:

HSW
1 AIA LU/HSW
AIBD
1 AIBD P-CE
IACET
0.1 IACET CEU*
AAA
AAA 1 Structured Learning Hour
AANB
AANB 1 Hour of Core Learning
AAPEI
AAPEI 1 Structured Learning Hour
MAA
MAA 1 Structured Learning Hour
NLAA
NLAA 1 Hour of Core Learning
NSAA
NSAA 1 Hour of Core Learning
NWTAA
NWTAA 1 Structured Learning Hour
OAA
OAA 1 Learning Hour
SAA
SAA 1 Hour of Core Learning
 
This course can be self-reported to the AIBC, as per their CE Guidelines.
This course is approved as a Structured Course
Approved for structured learning
Approved for Core Learning
This course is approved as a Core Course
Course may qualify for Learning Hours with NWTAA
Course eligible for OAA Learning Hours
This course is approved as a core course
This course can be self-reported for Learning Units to the Architectural Institute of British Columbia

Building envelopes need to create the four barriers needed as part of any building enclosure, namely water-resistive barriers (WRBs), air barriers (ABs), thermal barriers, and vapor retarders. Commonly, those are each thought of as independent products or systems that are easy to imagine across a smooth continuous plane in a wall or roof deck. However, actual construction isn’t completely smooth and continuous. There are places where different materials and assemblies meet, such as the transition from an above-grade wall to a concrete slab or foundation wall. There are also openings in most walls for windows, doors, and other features, meaning there is a transition of the barriers around those openings. The place where the roof meets the wall, particularly in a commercial building that may have a parapet wall, is another transition area where the continuity of the barriers can be compromised if they are not designed, detailed, and installed correctly. In this course, we will focus on these three transition areas in particular: wall to foundation, openings, and roof to wall. Further, recognizing the innovations and risk mitigation needed in building envelope design, we will also look at the latest advances in all-in-one, integrated gypsum sheathing that include WRB and AB systems during manufacturing as alternatives to field-applied water- and air-barrier systems. These integrated systems have been shown to reduce improper field installations, speed up installation, and save time and money during construction. As such, greater reliability and less risk have been found in using such integrated solutions compared to separate field-applied solutions.

Making Trans

Peter J. Arsenault, FAIA, NCARB, LEED AP, is a nationally known architect, consultant, continuing education presenter, and prolific author advancing building performance through better design. www.linkedin.com/in/pjaarch, www.pjaarch.com

 

Georgia-Pacific Gypsum The Georgia-Pacific DensElement® Barrier System, with AquaKOR Technology, integrates the gypsum core and the fiberglass mat to form a hydrophobic, monolithic surface that blocks bulk water, but allows vapor to pass through. The Georgia-Pacific DensElement® Barrier System eliminates the need for building wrap, fluid-applied membranes or peel-and-stick membranes. It’s faster to install and can be installed when it’s wet outside–saving time and labor. The all-in-one Georgia-Pacific DensElement® Barrier system is finished with DensDefy Liquid Flashing to fill and seal joints, fasteners, openings, penetrations and transitions. The Georgia-Pacific DensElement® Barrier System is ABAA listed and WRB-AB approved and has a customized MasterSpec® specification –061656 Air and Water Resistive Sheathing Board. For more information, visit www.denselement.com

 

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