Wallboard (aka Drywall aka Gyprock) Shearwall openings 1

Hello All;

I was sure I had seen a provision for ignoring the effects of opening in a timber frame and drywall shear wall; and if memory serves it stipulated that the opening be restricted to a 1/3 height of wall height and a 1/3 of length opening width. Does anyone recall seeing same, and do you know of a reference for this guidance?

Thanks in advance,

YS

B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...