1 of 63 Building Enclosure Design for Walls and Low-Sloped Roofs COLIN SHANE M.ENG., P.ENG., P.E. PRINCIPAL, SENIOR PROJECT MANAGER RDH BUILDING SCIENCE INC. Disclaimer: This presentation was developed by a third party and is not funded by WoodWorks or the Softwood Lumber Board. APRIL 2018
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Building Enclosure Design for Walls and Low-Sloped Roofs...àThis session focuses on design considerations and best practices associated with detailing walls and low-slope roofs for
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Building Enclosure Design for Walls and Low-Sloped RoofsCOLIN SHANE M.ENG., P.ENG., P.E.
PRINCIPAL, SENIOR PROJECT MANAGER
RDH BUILDING SCIENCE INC.
Disclaimer: This presentation was developed by a third party and is not funded by WoodWorks or the Softwood Lumber Board.
APRIL 2018
This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written
“The Wood Products Council”is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES), Provider #G516.
Credit(s) earned on completion of this course will be reported to AIA CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request.
This course is registered with AIA CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product.__________________________________
Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
Course Description
à This session focuses on design considerations and best practices associated with detailing walls and low-slope roofs for durable wood structures. Starting with a review of building science fundamentals, it highlights durable, energy-efficient options for wood-frame wall assemblies. It then discusses low-slope roof design with an emphasis on ventilation, insulation placement, and the impact of each on long-term performance. Placement of control layers and dew point locations will be reviewed in the context of providing moisture protection while allowing drying, with the goal of achieving maximum durability. Details and case studies will be used to illustrate best practices and lessons learned.
Learning Objectives
1. Review building science fundamentals and building enclosure design considerations for light wood-frame buildings.
2. Explore the thermal benefits of utilizing wood-frame construction.
3. Review how insulation and control layer placement in a wood-frame assembly affect moisture presence, movement, and evaporation.
4. Discuss concepts for proper ventilation in low-slope roofs and review assembly and detailing lessons learned from case studies.
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Wood-frame Building Enclosure Design Guides
à 2011 Building Enclosure Design
Guide – Wood-frame Multi-Unit
Residential Buildings
à Emphasis on best practices,
moisture and new energy codes
à 2013 Guide for Designing Energy-
Efficient Building Enclosures
à Focus on highly insulated wood-
frame assemblies to meet current
and upcoming energy codes
à CLT Handbook
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Building Science Basics
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à Supportà Structural loads
à Controlà Heat flow
à Air flow
à Vapor diffusion
à Water penetration
à Condensation
à Light and solar radiation
à Noise, fire, and smoke
à Finishà Being durable and maintainable
à Being economical & constructible
à Looking good!
Building Enclosure Design Fundamentals
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The Old Way
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The New Way – “Light & Tight”
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Old versus New
à Trend towards more energy efficiently building enclosures
à Air barriers now required as of the 2012 IECC
à Continuous insulation becoming more common
à Seeing more new building materials, enclosure assemblies and
construction techniques
à More insulation = less heat flow to dry out moistureà “Marginal” assemblies that worked in the past may no longer
work
à Amount, type and placement of insulations matters, for vapor, air
and moisture control
à Need to fully understand the science and interaction of design parameters
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What do we know?
Building Enclosure
Control Air
Control Vapor
Control heat
Control Rain
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Building Enclosure Control Layers
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Water Control Strategy
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How do Walls get Wet and Dry?
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Water Penetration Control Strategies
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“Rainscreen” Cladding
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Air Control Layer
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2015 IECC Air Barrier Requirement
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Air, Vapor, or Water Barrier?
Tyvek
GoreTex
HDPE
à Air is made up of oxygen, nitrogen, and water vapor (water vapor is the smallest molecule)