All roofs must be designed to sustain loads as follows:
(1) Dead loads plus a minimum unit live load of 30 lb/ft2 (2 months load duration); and
(2) A vertical net uplift load of 9 lb/ft2 (1 day load duration).
[Statutory Authority: RCW
43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150C-0850, filed 10/23/96, effective 11/25/96.]