Spacing between branch lines shall not exceed 10 ft (3 m).Where spacing or arrangement of stringers constitutes typical open-joist construction directly supporting the deck, sprinkler branch lines shall be installed between the bents at right angles to the stringers and shall meet the following requirements:.The maximum coverage per sprinkler head shall be limited to 80 ft 2 (7.4 m 2).
The following design and installation guides shall apply where pendent sprinklers in the upright position or old-style sprinklers are to be utilized: