10/9/2012 1 High Performance Wood Framed Wall Systems for Passive House Design Stanley D. Gatland II CertainTeed Corporation 7 Annual North American Passive House Conference Annual North American Passive House Conference Annual North American Passive House Conference Annual North American Passive House Conference September 27 September 27 September 27 September 27-30, 2012 Denver CO 30, 2012 Denver CO 30, 2012 Denver CO 30, 2012 Denver CO Session Learning Objectives: • Understand low-energy building design goals • Understand how to assess moisture risk in low- energy wall designs • Review the four moisture flow mechanisms • Identify the critical components in constructing low-energy walls • Understand the concept of hygrothermal analysis 7 Annual North American Passive House Conference Annual North American Passive House Conference Annual North American Passive House Conference Annual North American Passive House Conference September 27 September 27 September 27 September 27-30, 2012 Denver CO 30, 2012 Denver CO 30, 2012 Denver CO 30, 2012 Denver CO
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High Performance Wood Framed Wall Systems for … 1 High Performance Wood Framed Wall Systems for Passive House Design Stanley D. Gatland II CertainTeed Corporation 7777 Annual North
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10/9/2012
1
High Performance
Wood Framed Wall Systems
for Passive House Design
Stanley D. Gatland II
CertainTeed Corporation
7777thththth Annual North American Passive House ConferenceAnnual North American Passive House ConferenceAnnual North American Passive House ConferenceAnnual North American Passive House ConferenceSeptember 27September 27September 27September 27----30, 2012 Denver CO30, 2012 Denver CO30, 2012 Denver CO30, 2012 Denver CO
Session Learning Objectives:
• Understand low-energy building design goals
• Understand how to assess moisture risk in low-
energy wall designs
• Review the four moisture flow mechanisms
• Identify the critical components in constructing
low-energy walls
• Understand the concept of hygrothermal analysis
7777thththth Annual North American Passive House ConferenceAnnual North American Passive House ConferenceAnnual North American Passive House ConferenceAnnual North American Passive House ConferenceSeptember 27September 27September 27September 27----30, 2012 Denver CO30, 2012 Denver CO30, 2012 Denver CO30, 2012 Denver CO
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• Low-energy building design goals
• Moisture risk analysis
• Moisture flow mechanisms and common building material hygrothermal properties
• Survey of PHIUS wall assembly details
• Hygrothermal analysis examples
• Q & A Ag
en
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Ag
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Low-Energy Building Design Goals
Control heat transfer & air leakage :• Increase thermal insulation levels & reduce
thermal bridging• Integrate continuous air barrier systems & space
compartmentalization• Specify high performance fenestration systems
Improve indoor environmental quality (IEQ):• Specify high performance HVAC systems that
include insulated & air tight ductwork• Require controlled & pre-conditioned fresh
air ventilation• Integrate materials that improve indoor air quality
fiberglass board, air tight stud separator (with and without water vapor control)
• WRB– Spun bonded polyolefin– Air tight install
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Passive House Wall Design
% Moisture Content (MC) Comparison
No Interior Vapor Control
Max. MC after 36 months ~23%
With Interior Vapor Control
Max. MC after 36 months ~15%
Passive House Wall Design - Indianapolis, INPaint Only vs. SVR as Vapor Control Layer
• Cladding– Fiber cement
– Mounted on furring
• Single 16” TJI stud
• Sheathing (air tight)
– Fiberboard exterior
– Gypsum interior
• WRB– Spun bonded polyolefin
– Air tight install
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Passive House Wall Design
% Moisture Content Comparison
No Interior Vapor Control
Max MC after 36 months ~17%
Smart Vapor Retarder
Max MC after 36 months ~12%
Good Low-Energy Wall Information
• John Straube and Jonathan Smegal, Building America Special Research Project: High-R Walls Case Study Analysis, Research Report – 0903, Building Science Corporation, March 11, 2009 (Rev. June 8, 2011)
• Robb A. Aldrich, Lois Arena and William Zoeller, Practical Residential Wall Systems: R‐30 and Beyond, Building America Research Report, Steven Winter Associates, 2009
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Summary & Discussion
• Know the climate & microclimate
• Orientation makes a difference
• Building envelope air tightness is critical
• Successful integration of water resistive and air
barrier systems are critical
• Use cladding ventilation and drainage strategies