Continuous Air Barrier Design and Constructability: Lessons Learned
Presented By: Dan Taylor & Brian Gibson
What are air barriers and why are they important
• Premier
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AS THEY RELATE TO THE BUILDING ENCLOSURE
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AS THEY RELATE TO THE BUILDING ENCLOSURE
Introduction to Air Barriers
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Moisture Flow
Liquid Moisture (Water) causes 90% of the problems in buildings
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Moisture ProblemsWater vapor condensing in the building envelope leads to problems:
Mold
Corrosion
Wood rot
Ice Lensing, etc.
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Building Envelope Deterioration
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Water Transport1 METRE
1 METRE
2 cm x 2 cm HOLE1 METRE
1 METRE
TRANSPORT VIA AIR LEAKAGE
TRANSPORT VIA DIFFUSION
*ASSUMES RH 40%, 2 COATS ENAMEL PAINT, OTTAWA CLIMATE
30 LITRES
.5 LITRESwww.aridresources.com
Building Envelope Deterioration
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Self-Adhered Membranes• Limitations – Typical of Most Manufacturers
• Must be covered, not designed for permanent exposure.
• Not to be used in direct contact with flexible PVC/vinyl membranes or gaskets
• Not to be used with New PVC membranes – TPO at this time
• Products manufactured from EPDMwww.aridresources.com
One World
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Self-Adhered Membranes
• Properties – Typical of Most Manufacturers• Thickness: 1.0 mm• Application temp: minimum + 5o C (41o F) • Service temp: -40o C (-40o F) to 70o C (158o
F) • Elongation: 200% minimum• Air Leakage: 0.0005 L/s.m2
• Self-sealing when penetrated with self-tapping screws
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Liquid Membranes
• Lots of types –• Some Air / Vapor Barriers• Some are Vapor Permeable
• Memorial Stadium• East Side Addition
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Residence Hall at the University of Nebraska
Memorial Stadium at the University of Nebraska
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Liquid Membranes• Lots of types –
• One Component• Two Component• Cold Applied / Hot Applied• Spray or Trowel Applied - UNMC Eye Institute
• Some may be applied to Green Concrete
Liquid Membranes
• Properties – Typical Manufacturer • 7-10 dry mils up to 60 dry mils• Application temp min: 20 F (similar to SA)• 40-90 degrees• Elongation: 100% - 1800% • Solids by content may be 60% - 100 % depending on material (ie. 100 % solids by content means wet thickness = dry thickness
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• Lots of types –• Low Density• Medium Density• High Density• Open cell• Closed cell
Sprayed Urethane Foam
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• Lots of types –• Because it is a “foam”, does not mean it is an Air Barrier !!
• May be suitable only as a thermal insulation
Sprayed Urethane Foam
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• Have the installer and the contractor document the installation
• Verify proper installation and confirm installer’s knowledge through site audits
• Track the manufacturer, the contractor and the installer though a database
ABAA Quality Assurance ProgramSummary of the Program
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ASTM D 4541 pull adhesion testing.
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Training installers to install self adhered membranes.
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Design Considerations
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-Memorial Stadium
Where do I go from here…Look at assemblies, not just single materials
• What is the performance requirements of my building ?
• What is the sequence of construction ?
Conclusion
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• Where do I go from here…• How do I specify an assembly properly ?
• ABAA specifications• ABAA approved materials• ABAA approved assemblies (coming soon)
Conclusion
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Questions?Any questions please email Brian Gibson at [email protected]
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