SR131 BRANZ test and evaluation method EM3-V2 for bracing rating of walls to NZS 3604 (2004)

This report presents the basis for changing the current BRANZ test and evaluation procedure used to establish bracing ratings. This is known as the BRANZ P21 test method and is used to obtain the bracing ratings of timber-framed, plank or panel, wall systems for houses (and other low-rise structures) to meet the wind and seismic demand stipulated in the timber-framed building standard NZS 3604:1999.

The demand wind and seismic loads in NZS 3604 were based on the loadings specified in the New Zealand loadings standard NZS 3203:1992. This report presents a revised wind and earthquake test and evaluation method (called EM3) which is based on engineering analysis to ensure the as-built house strength constructed with EM3 assessed walls will achieve the NZS 4203:1992 intent in a reliable but economical manner.