ENGINEERING SERVICES Report National Sunroom Association

1. Dan Walker, P.E. Thomas Associates, Inc. Thursday, April 19, 2012 ENGINEERING SERVICES ReportNational Sunroom Association

2. Topics for Discussion • ICC Code Update • ASCE 7-2010 • What’s Happening for ASCE 7-2016 • State Energy Codes • Industry Opportunities

3. ICC Code Update

4. ICC Code Development Process • 2012 is the most recent edition of the codes • 2015 is currently under development • ICC now has two code development tracks • Group A – Includes IBC, and others • Group B – Includes IRC, IECC and others • For 2015 Code Proposals: • Group A deadline was January 3, 2012 • Group B deadline will be January 3, 2013 • Code Development Hearing, Group A • April 29 – May 8, 2012 in Dallas, Texas • Final Action Hearing, Group A • October 24 – 28, 2012 in Portland, Oregon

5. What are people saying? What questions come up? ICC Online Code Forums

10. 2009 IRC Guidance

12. AWA Deck Design Guide • AWA = American Forest & Paper Association • Available free at: http://www.awc.org/Publications/DCA/DCA6/DCA6-09.pdf • Applicable to “open decks” • Does not include loads from sunrooms • Addresses 2009 IRC code requirements for decks • Prescriptive tables and formulas with drawings • Ledger attachment requirements • Lags, through bolts, sizing and spacing • Footing requirements • Joist span tables • Beam span tables • Guard rail design and attachment

17. Status of I-Code Adoptions • Source: http://www.iccsafe.org (as of April 4, 2012) • IRC 2000 • 2 states (4%) (Missouri & Texas) • IRC 2003 • 3 states (6%) (Connecticut, Indiana, Ohio) • IRC 2006 • 15 states (30%) • IRC 2009 • 29 states (58%) • IRC 2012 • 1 state (2%) (Maryland)

18. Status of State Energy Codes

19. Status of Code Adoption: Residential Overview of the currently adopted residential energy code in each state as of April 5, 2012

20. Adoption Activity: Residential States that are expected to have residential energy codes meeting or exceeding the 2009 IECC by the end of 2015 as of May 5, 2011

21. States that can use REScheckTM States, counties, or local jurisdictions that have residential energy codes supported in REScheck.

22. ASCE 7-2010 Update

23. ASCE 7-10 Update • Is now available • Risk based standard, changed from occupancy based • Wind speed basis changed – 3 maps (Category I, Category II & III, Category IV) • 700 year to 1700 year map (higher wind speeds) • Load factors are incorporated, like seismic • TA analysis of major cities shows same or lower wind loads for most structures) • Higher wind loads on the hurricane coasts

24. ASCE 7-10 Update (cont’d) • Important Take Away: We found most wind loads actually decreased, especially in the inland areas. Some areas along the coasts had modest increases. • For ASD design method, multiply calculated loads by 0.60 (because load factors are already included in new method) • Your contractors, dealers, branches, etc. will need to know the difference in wind speeds between ASCE 7 editions

25. Updated Wind Map – Category II

26. Updated Wind Map – Category III & IV

27. ASCE 7-10 Update (cont’d) • Snow Load – previous ASCE 7-05 excluded 70 degree slope and greater from unbalanced drifting • ASCE 7-10 exempts slopes ≥ 7:12 and ≤ ½:12 • Sliding snow is clarified as not combined

28. ASCE 7-2016 Predicting the Future

29. ASCE 7-2016 – What Could Be Coming? • Remove Low-Rise Provisions from the body of the standard and place them in an Appendix • The key here is that the low rise provisions would continue to be an acceptable method, perhaps in an Appendix or Volume 2. • Canopies on the side of buildings may be addressed • Better Exposure B & C definitions in the commentary • Exposure B vs. Exposure C is somewhat unclear • Exposure C often becomes the default • A new look at this might help to justify Exposure B

30. ASCE 7-2016 – Tea Leaves • Resolve differences between methods for MWFRS • All Heights • Low-Rise • Possibility these methods could be combined • Currently, using the two methods yields different loads • This has caused concern for some ASCE Wind subcommittee members

31. ASCE 7-2016 – What Blew In • Component and Cladding Pressure coefficients could be increasing • Research done at University of Western Ontario on various roof slopes for hip & gable roofs shows current ASCE coefficients may be inadequate • Tests were performed at multiple roof slopes • Tests performed at 1, 2 and 3 stories height • Models on turntable and rotated at various angles

32. Wind Tunnel Testing (1:50 scale)

33. Pressure Coefficients – Gable Zone 1 (Others not shown here)

34. What Can We Do? Industry Opportunities

35. Industry Opportunities • ASCE Educational Short Course • Aluminum Structural Design with the 2010 Aluminum Design Manual • Taught by Randy Kissell • May 10-11 in Tampa, Florida • July 19-20 in Baltimore, Maryland • Increase NSA membership • Contact previous members • Solicit new members

36. Industry Opportunities • White Papers / Develop member resources • Website • Articles • Codes & Standards • Move from monitoring geographic issues to influencing geographic codes of interest • Current approach is reactive, not proactive • States appear to be adopting newest codes with their own state amendments • Examples of this include Minnesota, Florida and North Carolina energy codes

37. Industry Opportunities, Cont’d • International Residential Code • Submit code proposal with AAMA to excerpt portions of AAMA/NPEA/NSA 2100-11 into the IRC for sunrooms

38. Any Questions?