George, I guess now the ONLY methodology is smoke modeling and timed egress analysis (which is no guarantee- you have to do the work, hit calc, and keep your fingers crossed). Is this what you did in the past to "...gain variances..."? You should still be able to install mass quantities of ESFR though because even with auto vents the dist cannot be increased. One of the code gurus here is going to find out the reasoning for no increase with auto vents now.
-----Original Message----- From: George Church [mailto:[email protected]] Sent: Tuesday, June 22, 2010 6:02 PM To: [email protected]; [email protected] Subject: RE: IBC egress distances >250' Let me re-phrase the question, now that we in PA have adopted the 2009 I-codes. In 2006 edition we could extend egress distances from 250' to 400' by using vents. That section isn't in the 2009 edition, so we've lost the ability to efficiently build big boxes wherein I'd like to install mass quantities of ESFR sprinklers. Has anyone seen a methodology within the 2009 edition of the IBC to replace the Vent exception? That's my question. I'm aware the 2006 edition's vent exception, and have gained variances using the approach I explained in the first post. But that's not what I'm asking now, I'd solved that problem, now we have a new playbook and I can't find the one marked "extended egress". Thom, the tunnel would work if a) the building was up and that was only quick way to get occupancy b) they figure how to do that under a floor capable of supporting rack storage. I can ses it now, a mini-London Underground below the warehouse, Tube stops. Mind the gap! glc -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brad Sent: Tuesday, June 22, 2010 1:26 PM To: [email protected]; [email protected] Subject: RE: IBC egress distances >250' I should re-phrase-----how were we successful in maintaining increased dist? -----Original Message----- From: Brad [mailto:[email protected]] Sent: Tuesday, June 22, 2010 12:00 PM To: [email protected] Subject: RE: IBC egress distances >250' No- Section 104 allows alternate methods and materials- such as smoke modeling with timed egress analysis-- horizontal exits at 250' max would work. (btw- the previous code allowed deleting auto vents, but the travel dist. Could not be increased too) -----Original Message----- From: George Church [mailto:[email protected]] Sent: Tuesday, June 22, 2010 11:51 AM To: [email protected] Subject: IBC egress distances >250' Back under the 2006 IBC, we could go thru the motions of providing roof vents, get the egress increase under 1016.2 Roof Vent Increases, and then install ESFR and loose the vents, and we'd been successful in maintaining the increased egress distances (to 400'). However, while we're pretty fond of the IRC part of our new code, the 2009 IBC has totally removed the 1016.2 increase for a S1 occupancy. Now that the occasional big-box distribution center comes out for bid after the economic mess, is there another means to erect an S1 building wider than 500'? glc _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
