Openings spaced three times the dimension D on center or more require reinforcement as individual openings per the engineering table. Openings spaced less than three times the dimension D on center are treated as a single larger opening based on the largest opening dimension and reinforced accordingly.
OPNG'S SPACED 3xD oc OR MORE SHALL BE REINFORCED AS INDIVIDUAL OPNG'S PER TABLE TREAT AS SINGLE LARGER OPNG. PER TABLE OPNG. SPACED LESS THAN 3xD oc SHALL BE TREATED AS SINGLE LARGER OPNG. & REINFORCED ACCORDINGLY D D D ON LARGEST OPNG.) 3xD oc MIN. (BASED LARGEST OPNG.) LESS THAN 3xD oc (BASED ON
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