Understanding the 2012 IRC Brace Wall Methods

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Presentation transcript:

Understanding the 2012 IRC Brace Wall Methods in section R602.10

R602. 10. 1 Braced Wall Lines (BWL’s). R602. 10. 1 R602.10.1 Braced Wall Lines (BWL’s) R602.10.1.1– Length of Braced Wall Line Defines Distance Between the end as; -At intersections with a perpendicular BWL -At angled BWL -At exterior wall -Establishes the concept of the “imaginary line” used to establish the location of the Braced wall Line (BWL) -Plans must clearly indicate the location of the BWL’s for proper assessment R602.10.1.2 – Offsets along BWL No more than 4’ from the designated BWL location No more than 4’ for interior walls used as BWL’s

R602.10.1.3 – Spacing of BWL’s -Using table R602.1.3 for wind condition 85 mph to < 110- not more than 60” Intermediate BWL’s through the interior shall be permitted R602.10.2.2- Locations of Braced Wall Panels Within 10’ from each end of BWL 20’ between measured from edge to edge R602.10.2.3 -BWL’s less than 16’ shall have two panels of any qualified length or one 48” or more. Greater than 16’ needs to have a minimum of two BWP’s R602.10.3 Sub-paragraph 1 directs you to use two tables, one using Wind speed and the other is the adjustment factor table.

Sample house- as shown on plan Find the required length of bracing for BWL 3 Givens- -90 mph wind (2012 IRC) -Exposure C -One story -Eave -to-ridge height 10’ -Walls 12’ 30’ 20’ 40’

Begin your Calculations #1 - Choose your requirements Table R602.10.3(1) -Spacing(Between BWL’s) -Method of bracing WSP (wood structural panels) = Required minimum length of BWP is 5.5’

#2 Adjustment Factors Exposure category -one story – condition “C”- Adj. Factor= 1.2 Roof eave -to-ridge height- roof only- 10’=1.0 Wall height Adjustment- 12’= 1.10 Number of BWL- 3=1.30 Total required 5.5 5.5’ x 1.2 x 1.0 x 1.1 x 1.3= 9.44’ of required BWP Along that one BWL you will need 9.44’ of bracing (Adjusted factor) Compare each BWL using this same Method and provide on the Plans.

Calculate the remainder of the house ;bracing methods, Using Tables R602.10.4,R602.10.5 & R602.10.7 Calculate the remainder of the house ;bracing methods, bracing methods minimum length with opening, short walls, hold downs, etc.

Contact your local jurisdiction if you have any questions Make sure to have all your Braced Wall Lines on the plan Identify all Braced Wall Panels by method used and location along the BWL Show hold down location for Alternate Brace Panels Contact your local jurisdiction if you have any questions