1. ENGINEERING SERVICES Report National Sunroom Association
Dan Walker, P.E.
Thomas Associates, Inc.
Thursday, April 19, 2012
ENGINEERING SERVICES Report National Sunroom Association
National Sunroom Association General Meeting

2. Topics for Discussion ICC Code Update ASCE 7-2010
What’s Happening for ASCE
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:
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: (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 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 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
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 – 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. Industry Opportunities
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 in Tampa, Florida
July 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 into the IRC for sunrooms

38. Any Questions?