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Building Envelope Summary: Hygrothermal Assessment of Systems for Mid-Rise Wood Buildings

https://research.thinkwood.com/en/permalink/catalogue250
Year of Publication
2014
Topic
Design and Systems
Fire
Moisture
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Author
Abdulghani, Khaled
Cornick, Steve
Di Lenardo, Bruno
Ganapathy, Gnanamurugan
Lacasse, Michael
Maref, Wahid
Moore, Travis
Mukhopadhyaya, Phalguni
Nicholls, Mike
Saber, Hamed
Swinton, Michael
van Reenen, David
Organization
National Research Council of Canada
Year of Publication
2014
Format
Report
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Topic
Design and Systems
Fire
Moisture
Keywords
National Building Code of Canada
Mid-Rise
Building Envelopes
Research Status
Complete
Summary
The role of the building envelope research team in this project was to assess whether midrise wood-frame (LWF) and cross-laminated timber (CLT) building envelope solutions developed by the fire research team to meet the fire provisions of the National Building Code (NBC) 2010 Part 3 Fire Protection, would also meet the NBC Part 5 Environmental Separation requirements relating to the protection of the building envelope from excessive moisture and water accumulation. As well, these wood-based mid-rise envelope solutions were to be assessed for their ability to meet Part 3 Building Envelope of the National Energy Code for Buildings (NECB) 2011. Requirements relating to heat, air, moisture, and precipitation (HAMP) control by the building envelope are included in Part 5 Environmental Separation of the NBC 2010. Part 5 addresses all building types and occupancies referred to in Part 3, but unlike requirements for fire protection, this section of the code was written more recently and is generic, including requirements that are more objective-oriented rather than prescriptive requirements pegged to specific constructions systems. The investigated methodologies developed and adapted for this study took those code characteristics into account.
Online Access
Free
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Climatological Analysis for Hygrothermal Performance Evaluation: Mid-Rise Wood

https://research.thinkwood.com/en/permalink/catalogue755
Year of Publication
2014
Topic
Moisture
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Author
Cornick, Steve
Swinton, Michael
Organization
National Research Council of Canada
Year of Publication
2014
Format
Report
Material
Light Frame (Lumber+Panels)
Application
Wood Building Systems
Topic
Moisture
Keywords
Climate
Hygrothermal
Mid-Rise
Moisture Content
National Building Code of Canada
Water Penetration
Research Status
Complete
Summary
The objective of the task is to select, from the 679 locations in Table C-2 of the 2010 National Building Code of Canada (NBC 2010) [1], several representative locations for which long-term historical weather data exists. This information from these locations can subsequently be used to determine the exterior boundary conditions for input files for hygrothermal simulation programs and hygrothermal testing in the laboratory. This report discusses the selection of locations for the hygrothermal simulation task of the project on Mid-rise Wood Buildings and the determination of spray-rates and pressure differentials for the water penetration testing portion of the project.
Online Access
Free
Resource Link
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Mid-Rise Wood Constructions: Hygrothermal Modelling and Analysis

https://research.thinkwood.com/en/permalink/catalogue6
Year of Publication
2014
Topic
Design and Systems
Moisture
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Walls
Author
Abdulghani, Khaled
Swinton, Michael
Cornick, Steve
Organization
National Research Council of Canada
Year of Publication
2014
Format
Report
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Application
Walls
Topic
Design and Systems
Moisture
Keywords
Damage
Load Bearing
Moisture Content
Simulation
Hygrothermal
Research Status
Complete
Summary
In general for both wall constructions simulation results tended to point to the exterior of the stud in the Lightweight Wood Frame (LWF) and Cross Laminated Timber (CLT) construction cases to be the area most at risk, specifically toward the exterior surface of the stud. Generally the total Moisture Content (MC) of the stud decreased to an acceptable level within the simulation period however the exterior surface appeared to remain at relatively high of moisture content level for significant periods of time. The presence of wood strapping covering the exterior face of the stud seemed to exacerbate the situation. If a support system for the cladding can be designed that does not rely on wood strapping or covers a minimum area of the stud the performance of this critical area could be improved. If the initial moisture content of the wood materials could be reduced before close up the performance would also be improved for all locations that did not show an increase in moisture content and the RHT index in the second year, at least with respect to computer modelling. This work however was not in scope of the work.
Online Access
Free
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Mid-Rise Wood Constructions: Specifications of Mid-Rise Envelopes for Hygrothermal Assessment

https://research.thinkwood.com/en/permalink/catalogue754
Year of Publication
2014
Topic
Serviceability
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Solid-sawn Heavy Timber
Application
Wood Building Systems
Author
Abdulghani, Khaled
Cornick, Steve
Di Lenardo, Bruno
Ganapathy, Gnanamurugan
Lacasse, Michael
Maref, Wahid
Moore, Travis
Mukhopadhyaya, Phalguni
Nicholls, Mike
Saber, Hamed
Swinton, Michael
Organization
National Research Council of Canada
Year of Publication
2014
Format
Report
Material
CLT (Cross-Laminated Timber)
Light Frame (Lumber+Panels)
Solid-sawn Heavy Timber
Application
Wood Building Systems
Topic
Serviceability
Keywords
Hygrothermal
Mid-Rise
Building Envelope
Long-term
Degradation
Research Status
Complete
Summary
The role of the Building Envelope team in this project is to assess whether alternate wood-based building envelope solutions developed by the Fire Team to meet the fire provisions of NBC 2010, also meet NBC Part 5 requirements relating to the protection of the building envelope from long term degradation due to uncontrolled heat, air, moisture and precipitation (HAMP) ingress into the building envelope of mid-rise buildings. In a process of consultations with stakeholders, including the Canadian Wood Council (CWC), FPInnovations, and consultations with NRC’s Fire and Acoustics teams, specifications were developed for 2.44 m x 2.44 m wall specimens that would be investigated for hygrothermal performance.
Online Access
Free
Resource Link
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