Building Enclosures for Mass Wood Buildings Facades+ Toronto October 11, 2019 Brian Hubbs, P.Eng.
Principal, Senior Building Science Specialist
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A Few of Our Past & Current Mass Timber Projects
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Catalyst Spokane, WA
Carbon 12 Portland, OR
First Tech Federal Credit Union
 Hillsboro, OR
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A Confluence of Drivers to Next Generation Wood Buildings & Building Enclosures
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Energy Codes & Carbon Counting (More Insulation &
 Better Airtightness)
Mass Timber Structures
Prefabrication of Enclosures
(Need Protection)

(Faster, Necessary & More Cost Effective)
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Mass Timber Structure
The Building Enclosure 6
Conventional Construction Moisture Risk
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UBC Brock Commons, Tall Wood Houseโ จ Faรงade Challenge
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UBC Brock Commons - Façade Design Criteria
Fast installation – 1 floor/day & water tight to protect structure
Installed without access to exterior – no sealing or finishing
Durable & Highperformance
Resistant to water & able to install in rain
Pre-installed cladding & windows
Thermally Efficient, >R-16 effective walls
Inexpensive, <$65/sqft installed & finished
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Precedents for Prefabrication of Tall Wood
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Precedents for Prefabrication of Tall Wood
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Precedents for Prefabrication of Tall Wood
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UBC Brock Commons- What Wasnâ&#x20AC;&#x2122;t Feasible
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Unitized Curtain wall Optionâ&#x20AC;¨ Problem: Cost, Schedule, Energy
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Tall Wood Prefabrication Option â&#x20AC;&#x201C; Large Panel with Pre-installed Windows
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Prefabricated Panel Competition Mock-ups
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Laboratory Mock-up & Physical Testing
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Centura â&#x20AC;&#x201C; Factory Floor Prefabrication
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Site Installation is at pace with structure â&#x20AC;&#x201C; 1 floor/day
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Field Testing and Commissioning
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A Trifecta of Progression in Future Building Enclosures Prefab, Passive House, & Mass Timber
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Next Generation - Curtain Wood: Prefabricated Thin CLT Wall Panels for Passive House and Net Zeroâ&#x20AC;¨
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Discussion + Questions Brian Hubbs, P.Eng. Principal, Senior Building Science Specialist
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Moisture Considerations and Risk
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Mass Timber and Mopisture
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CLT Panel Interface Airtightness?
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The Biggest Challenge with NLT Overhangs
At joints between 4x12 hemlock beams At joints between blocking At deflection joint above curtain-wall frames Exterior
Interior
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Air Barrier/WRB Membranes for CLT Panels
Liquids
Vapor permeable self-adhered sheets
Liquids
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Discussion + Questions Brian Hubbs, P.Eng. Principal, Senior Building Science Specialist
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