Expert Meeting Report: Cladding Attachment Over Exterior Insulation P
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Expert Meeting Report: Cladding Attachment Over Exterior Insulation P. Baker Building Science Corporation October 2013 NOTICE This report was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor any agency thereof, nor any of their employees, subcontractors, or affiliated partners makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or any agency thereof. Available electronically at http://www.osti.gov/bridge Available for a processing fee to U.S. Department of Energy and its contractors, in paper, from: U.S. Department of Energy Office of Scientific and Technical Information P.O. Box 62 Oak Ridge, TN 37831-0062 phone: 865.576.8401 fax: 865.576.5728 email: mailto:[email protected] Available for sale to the public, in paper, from: U.S. Department of Commerce National Technical Information Service 5285 Port Royal Road Springfield, VA 22161 phone: 800.553.6847 fax: 703.605.6900 email: [email protected] online ordering: http://www.ntis.gov/ordering.htm Printed on paper containing at least 50% wastepaper, including 20% postconsumer waste Expert Meeting Report: Cladding Attachment Over Exterior Insulation Prepared for: The National Renewable Energy Laboratory On behalf of the U.S. Department of Energy’s Building America Program Office of Energy Efficiency and Renewable Energy 15013 Denver West Parkway Golden, CO 80401 NREL Contract No. DE-AC36-08GO28308 Prepared by: P. Baker Building Science Corporation 30 Forest Street Somerville, MA 02143 NREL Technical Monitor: Cheryn Metzger Prepared under Subcontract No. KNDJ-0-40337-03 October 2013 iii [This page left blank] iv Contents List of Figures ............................................................................................................................................ vi List of Tables ............................................................................................................................................. vii Definitions ................................................................................................................................................. viii Executive Summary ................................................................................................................................... ix 1 Introduction ........................................................................................................................................... 1 2 Logistics ................................................................................................................................................ 2 3 Research Questions ............................................................................................................................. 4 3.1 Gravity Load Resistance ......................................................................................................4 3.2 Wind Load Resistance .........................................................................................................4 4 Objectives .............................................................................................................................................. 5 5 Agenda ................................................................................................................................................... 6 6 Presentation Summaries ..................................................................................................................... 7 6.1 Cladding Attachments of Exterior Insulation: History, Principles, and Codes ...................7 6.1.1 Questions and Discussion ......................................................................................11 6.1.2 Current Code Proposals .........................................................................................12 6.2 Exterior Cladding Attachment Research ...........................................................................12 6.2.1 Questions and Discussion ......................................................................................26 6.2.2 Proposed Deflection Limits and Potential Deflection ...........................................27 6.3 Structural Field Monitoring and Modeling of Thick Continuously Insulated Wall Assemblies .........................................................................................................................27 6.3.1 Questions and Discussion ......................................................................................36 6.3.2 Case Study Monitoring Setup: ...............................................................................36 6.4 Wind Performance Testing of Walls with Exterior Rigid Foam .......................................37 6.3.1 Questions and Discussion ......................................................................................41 6.4 Recent Wind Loading Research .........................................................................................41 6.4.1 Questions and Discussion ......................................................................................46 6.5 Installing James Hardie Siding Over Exterior Rigid Foam ...............................................46 6.5.1 Questions and Discussion ......................................................................................47 6.6 Open Discussion Period .....................................................................................................47 7 Answers to Research Questions ...................................................................................................... 49 7.1 Gravity Load Resistance ....................................................................................................49 7.2 Wind Load Resistance .......................................................................................................49 8 Action Items ........................................................................................................................................ 51 References ................................................................................................................................................. 52 v List of Figures Figure 1. Typical ASTM D1761 test setup ................................................................................................. 9 Figure 2. Example of measured load versus deflection ........................................................................ 10 Figure 3. Example of a single Z furring installation .............................................................................. 13 Figure 4. Examples of double Z furring installations (the one on the left has the same performance as a single furring, the one on the right improves performance by covering the first Z furring layer with insulation) ............................................................................ 13 Figure 5. Example of a clip and furring cladding attachment system ................................................. 14 Figure 6. Example of a furring strip attached directly back through the insulation to the structure ........................................................................................................................................ 14 Figure 7. BSC staff test setup (4-in. gap) ................................................................................................ 15 Figure 8. BSC staff test setup (4-in. mineral fiber insulation) .............................................................. 15 Figure 9. Load versus deflection (4-in. gap and 4 in. of insulation) .................................................... 16 Figure 10. Short-term gravity load response test setup ....................................................................... 18 Figure 11. Short-term load versus deflection for assemblies with 4 in. of exterior insulation ......... 19 Figure 12. Short-term load versus deflection for assemblies with 8 in. of exterior insulation ......... 19 Figure 13. Long-term gravity load response test setup ....................................................................... 20 Figure 14. Long-term load versus deflection for assemblies with 4 in. of exterior insulation ......... 20 Figure 15. Discrete load components ..................................................................................................... 22 Figure 16. Pre-compression force test setup ........................................................................................ 22 Figure 17. Example of friction component test setup (weights placed on top of the furring replicate pre-compression clamping forces) ................................................................................... 23 Figure 18. Exposed wall assemblies before the furring strips are loaded .......................................... 24 Figure 19. Exposed wall assemblies loaded to representative cladding weights .............................. 24 Figure 20. Exposed