ABSTRACT
Suppose that the existing building has within it a long cross-main running parallel to the long end of the new addition. The possibility of two cut-ins is now evident as an economically worthwhile option. The two supplies could supply sprinklers in the new addition laid out in tree fashion, like the one depicted in Figure A-2. Or, the two supplies could be arranged with branch piping on a grid. If the shape of the building addition is long and narrow, it would be conducive to a grid installation, and could also require just one supply line instead of the two previously suggested. However, if the rectangular building addition shape is more square, a looped system (which would require the two supplies if it is to be inter-connected with the existing main) might be a better solution.
