We have an newly constructed open parking garage with a surrounding skywalk. The building official is now asking for fire barriers complying with Chapter 31 between the two and the owner and architect want to deal with this using the exception that uses fire protection sprinklers for equivalency. It appears to me that the Code is asking us to protect the parking garage from the skywalk as the Code says to install fire protection sprinklers on the "interior" of the wall (which is the garage side) that fully wet the wall as a compliance path. We already have a fully sprinklered structure, with a row of dry sprinklers eight feet and eight feet on center away on the garage side, but the published spray pattern for the Reliable F1FR56 upright installed by the contractor would leave the top 3 feet of the wall unwetted.
It appears to me I would have to install an additional row of heads right along the wall, but even then, it looks like the spray pattern shows drop off at any sort of reasonable spacing so some parts of the wall remain unwetted. What have others done in this situation? [cid:[email protected]]<http://www.lhbcorp.com/who-we-are/our-history/> David Toshio Williams, PE, FPE - Senior MEP/FP Engineer 21 West Superior Street, Suite 500, Duluth, MN 55802 Direct 218.279.2436 | Cell 218.310.2446 LHBcorp.com<http://www.LHBcorp.com> LHB, Inc. | PERFORMANCE DRIVEN DESIGN.
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