better yet, put it at the top of the channel and it becomes your new point of measurement for distance below ceiling.
Roland On May 17, 2009, at 11:34 AM, Thom McMahon wrote: > Just an adder to what Ken said. The 3000sf design area has to be > used in all > adjacent areas, so if the area above the TJI's is occupied that to > must be > designed with 3000sf. > Pretty much if you see TJI's anywhere you have a 3000sf design area. > > Thom McMahon, SET > Firetech, Inc. > 2560 Copper Ridge Dr > P.O. Box 882136 > Steamboat Springs, CO 80488 > Tel: 970-879-7952 > Fax: 970-879-7926 > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Parsley > Consulting > Sent: Saturday, May 16, 2009 8:08 PM > To: [email protected] > Subject: Re: 24" TJI Wood Joist > > Phil, > > In the annex of the 2007 edition is something that might help: > > A.8.5.4.1 Batt insulation creates an effective thermal barrier and > can be > considered the ceiling/roof deck when determining distances between > deflector and ceiling. The insulation needs to be installed in each > pocket > (not just above the sprinkler) and attached to the ceiling/roof in > such a > manner that it will not fall out during a fire prior to sprinkler > activation > > Based on this, if you had three inches of batt insulation, at the > top of the > joist channel, it could be regarded as the effective "deck" above the > sprinkler deflector, which could then be located 1" down from the > bottom of > the CWJ, and remain 22" down from the face of the insulation. > > Additionally, it's a possible solution would be to provide a layer > of non- > or limited-combustible materials on the bottom of the composite wood > joists, > forming a non-sprinklered combustible concealed space above. The > caveat > there is that it forces the remote area below to increase to 3,000 > square > feet. You do get to reduce the density, but you still have to > calculate > 3,000 square feet. > > Those are some thoughts on what you can do. > > PARSLEY CONSULTING > Ken Wagoner, SET > 760.745.6181 voice > 760.745.0537 fax > [email protected] <mailto:[email protected]> e-mail > www.ParsleyConsulting.com <http://www.ParsleyConsulting.com> website > > > Phil Nawrocki wrote: >> Sirs, >> >> We have a contract to install fire sprinklers in a building with 24" >> deep TJI composite wood joist construction. They are 24" on center. >> I can find nothing in NFPA #13 deflector rules that allow the >> sprinkler deflector under obstructed construction to be below 22" >> from >> the deck. Is there any other way to protect the area besides putting >> a sprinkler in each 24" wide joist space? >> >> Regards, >> >> Phillip H. Nawrocki >> Design Manager >> National Fire Sprinkler, Inc. >> 1544 W. Grant St. >> Phoenix, AZ 85007-3314 >> (602) 712-1180 Phone Ext #33 >> (602) 712-1260 Fax >> [email protected] >> Fire Sprinklers Save Lives! >> >> >> >> _______________________________________________ >> Sprinklerforum mailing list >> http://lists.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 > http://lists.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 > http://lists.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 http://lists.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)
