The dimensions and material relationships shown in this detail are

The dimensions and material
relationships shown in this detail are
and have been exaggerated
for clarity. Actual dimensions will
vary, and should be carefully
coordinated with sequencing and
construction tolerances to ensure the
long-term durability and performance
of this and similar exterior wall details.
Interface conditions between building
envelope materials, components and
systems should be fully detailed in a
manner that is both technically sound
and serviceable. Detailing should, at a
minimum, allow for coordination of
drainage planes when two or more
different wall types are used in the
same facade; allow for thermal and
moisture-induced changes in material
properties and differential thermal
movement; and allow for in-service
deflection, shrinkage, creep and
similar behavior considered to be
within the allowable structural limits
of the project without compromise to
the weather-tight integrity and thermal
performance of the building envelope.
The air barrier can either be formed by
an exterior side air barrier or by
employing the interior side airtight
drywall approach.
The location of or need for a vapor
retarder within wall assemblies will
vary based upon climate, and can be
significantly influenced by the storage
capacity and vapor permeance of the
materials selected for each layer of the
wall system. A climate-specific,
hygrothermal analysis for any wall
assembly should be considered to
further evaluate this concern.
See the General section of the WBDG
for additional information and
The details, graphics and related information shown above are intended to illustrate basic design concepts and principles only and should be considered
collectively with the appropriate narrative sections of the Whole Building Design Guide (WBDG). The information contained herein is not intended for actual
construction, and is subject to revision based on changes and/or refinements in local, state and national building codes, emerging building envelope
technologies, and advancements in the research and understanding of building envelope failure and failure mechanisms. The actual design and configuration of
these and similar details will vary based upon applicable local, state and national building code requirements, climatic considerations, and economic constraints
unique to each project. Full compliance with the manufacturer's recommendations and recognized industry standards for each building envelope material,
component and system specified for this and similar exterior wall assemblies is recommended, and should be reflected in the appropriate sections of the project