Using the perfect enclosure approach to achieve Passive House

Transcription

10/29/11
6th Annual North American Passive House Conference - October 28-29
THE PERFECT ENCLOSURE APPROACH –
A RETROFIT CASE STUDY
Alex Lukachko, Building Science Corporation, Somerville, MA
History of
Control Functions
• Older Buildings
– One layer does
everything
• Newer Building
– Separate layers,
. . . separate functions
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Changes
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Basic Functions of the Enclosure
• 1. Support
– Resist and transfer physical forces from inside and
out
• 2. Control
Functional Layers
– Control mass and energy flows
• 3. Finish
– Interior and exterior
surfaces for people
• Distribution – a building function
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What is a high performance
enclosure?
• One which provides high levels of control
• Poor continuity limits performance
• Poor continuity causes most problems too:
– E.g. air leakage condensation
– Rain leakage
– Surface condensation
– Cold windows
• Particularly important for retrofits
www.BuildingScience.com
The “Perfect Wall”
• Finish of whatever
• Control continuity
– Rain control layer
• Perfect barrier
• Drained with gap
• Storage
– Air control layer
• Air barrier
– Thermal control layer
• Aka insulation, radiant barriers
– Vapor control layer
• Retarders, barriers, etc
• Structure can be anything
Fire Control may be needed
Sound Control optional
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Window
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Connections: Who is in charge
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Complexity increases detailing effort / risk of failure / cost
reduces performance
Enclosures
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Enclosure Design: Details
• Details demand the same
approach as the enclosure.
• • • Scaled drawings required at
Perfect Wall expanded
Fire Control may be needed
Sound Control optional
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Any R-value,
e.g.
4” PIC=R25
5”XPS =R25
6”MFI=R25
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Preliminary Airtightness
Measurements
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Questions?
Contact information:
• Alex Lukachko, Building Science Corporation
– [email protected]
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Using the perfect enclosure approach to achieve Passive House

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