Continuous air barrier design and constructability lessons learned
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This document discusses the importance of air barriers in building construction and presents lessons learned from various air barrier projects. It covers why air barriers are important for preventing moisture problems, examples of common air barrier materials like self-adhered membranes and liquid-applied membranes, and best practices for air barrier design and quality assurance. The conclusion emphasizes that air barrier systems should be designed and specified as whole assemblies rather than just individual materials. Specifiers are advised to consider the building's performance needs and construction sequencing in their air barrier design.
Continuous air barrier design and constructability lessons learned
- 1. Continuous Air Barrier Design and Constructability: Lessons Learned Presented By: Dan Taylor & Brian Gibson
- 2. What are air barriers and why are they important Premier www.aridresources.com
- 3. AS THEY RELATE TO THE BUILDING ENCLOSURE www.aridresources.com
- 4. Introduction to Air Barriers AS THEY RELATE TO THE BUILDING ENCLOSURE www.aridresources.com
- 5. Moisture Flow Liquid Moisture (Water) causes 90% of the problems in buildings www.aridresources.com
- 6. Moisture Problems Water vapor condensing in the building envelope leads to problems: Mold Corrosion Wood rot Ice Lensing, etc. www.aridresources.com
- 7. Building Envelope Deterioration www.aridresources.com
- 8. Water Transport 1 METRE TRANSPORT VIA AIR LEAKAGE 1 METRE 30 LITRES 2 cm x 2 cm HOLE 1 METRE TRANSPORT VIA DIFFUSION 1 METRE www.aridresources.com .5 LITRES *ASSUMES RH 40%, 2 COATS ENAMEL PAINT, OTTAWA CLIMATE
- 9. Building Envelope Deterioration www.aridresources.com
- 10. 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 www.aridresources.com TPO at this time Products manufactured from EPDM
- 12. 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 www.aridresources.com Air Leakage: 0.0005 L/s.m2 Self-sealing when penetrated with self- tapping screws
- 13. Liquid Membranes Lots of types Some Air / Vapor Barriers Some are Vapor Permeable Memorial Stadium East Side Addition www.aridresources.com
- 14. Residence Hall at the University of Nebraska Memorial Stadium at the University of Nebraska www.aridresources.com
- 15. 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
- 16. 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 % www.aridresources.com depending on material (ie. 100 % solids by content means wet thickness = dry thickness
- 17. Sprayed Urethane Foam Lots of types Low Density Medium Density High Density Open cell Closed cell www.aridresources.com
- 18. Sprayed Urethane Foam Lots of types Because it is a foam, does not mean it is an Air Barrier !! May be suitable only as a thermal insulation www.aridresources.com
- 20. ABAA Quality Assurance Program Summary of the Program Have the installer and the contractor document the installation Verify proper installation and confirm installers knowledge through site audits Track the manufacturer, the contractor and the installer though a database www.aridresources.com
- 21. ASTM D 4541 pull adhesion testing. www.aridresources.com
- 22. Training installers to install self adhered membranes. www.aridresources.com
- 31. Conclusion -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 ? www.aridresources.com
- 32. Conclusion Where do I go from here How do I specify an assembly properly ? ABAA specifications ABAA approved materials ABAA approved assemblies (coming soon) www.aridresources.com
- 33. Questions? Any questions please email Brian Gibson at bgibson@aridresources.com