www.rcabc.org  l  15
TECHNICAL Q & A
for the TS with sustained pressure less 
than or equal to 11.5 kPa (240 psf). An 
alternate method is also provided in the 
standard for resistance factor determi-
nation. Factored wind uplift resistance 
should be equal to or greater than the 
design load.
Q3: WHAT IS THE MAJOR  
ENHANCEMENT IN THE  
CSA A123.21-2026 EDITION?
There are four major revisions:
1.	Concrete decks requirement  
before components’ installation 
(Section 7.1.1);
2.	Tested specimen requirements 
for various types of roof systems, 
FIGURE 1: CSA A123.21 PROVISION IN THE NBCC 2026.
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