![]() Is the 2x4 deeper than the height of the triangle? The depth of the 2x4 member is what you now take into consideration. You've stated that the webs are made of 2x4's. Your least dimension would be the shortest side of the triangle (likely the "height"). To answer your latest question, think of it this way: The opening in the truss are going to be triangular. If the openings are less than 70% - Obstructed. Unobstructed construction has horizontal members that are not solid, where the openings are at least 70 percent of the cross-section area and the depth of the member does not exceed the least dimension of the openings, or all contstruction types where the spacing of the structural members exceeds 7 1/2'. ![]() N3.7.2 Unobstructed Construction: Construction where beams, trusses or other members do not impede heat flow or water distribution in a manner that materially affects the ability of a sprinkler to control or suppress a fire.
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