also funny is this could be a case where max deflector for unobstructed exceeds that for obstructed:
if extends 4.5" below insulation-- obstructed = 10.5" max below insulation due to 6" max below plane of obstructing member, vs 12" for unobstructed. you gotta love this stuff :) brad _____ From: Sprinklerforum [mailto:[email protected]] On Behalf Of Roland Huggins Sent: Wednesday, November 23, 2016 10:14 AM To: [email protected] Subject: Re: Ceiling of trusses and insulation - Character set not allowed ABSOLUTELY. What is funny is that Unobstructed with structural members less than 3 ft has a spacing limitation of 130SF. That makes perfect sense for trusses with a cumulative negative impact on discharge but why should it be 130 sf for a ceiling with 2x4 stringers? The reason is that after taking 3 cycles to FINALLY define an actual depth for unobstructed / obstructed, the issue of spacing has not been revisited - YET. On my list for next cycle (that being 2022 since we are in the middle of the 2019 cycle). Roland Huggins, PE - VP Engineering American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives Dallas, TX http://www.firesprinkler.org <http://www.firesprinkler.org/> On Nov 23, 2016, at 6:18 AM, Ed Kramer <[email protected]> wrote: Roland, If the structural members extended down below the insulation, but no further than 4", would you still consider it unobstructed? More than 4" - obstructed? Ed Kramer Bamford Fire Sprinkler
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