2 in 12 is considered flat. Over 2 in 12 is sloped, though, as Todd points out, in Cesar's case it is minimal. I wish I could easily point you to a head that has design data for sloped ceilings in warehouses but you need to define your storage requirement and design approach a bit more. If you're 12 feet or under with nothing outside the types and classes of commodities (i.e.: nothing too out of the ordinary) a head is probably available. If the building is still in the planning stage perhaps you can get the architect to lower the slope (anything between 2:12, minimum roof slope, and 3.5:12 will be a membrane of some sort). There are directions for using standard spray sprinklers in factories and warehouses with sawtooth roofs-anybody else here remember the fifties-many of the buildings are still around. I cannot believe there is no other solution than a costly and unnecessary ceiling, I just don't work with storage enough to have a handy solution in my pocket.
On Sun, May 30, 2010 at 7:58 AM, Todd Williams <[email protected]> wrote: > A 16.7% slope is 2.0:12. and 18% slope is > 2.16:12. The slope difference is 2" in 12 ft. > That is pretty minimal. Could you get a Code mod > for that? I would be tempted to go that route and > over-design the system a little. I have no idea > if the 2:12 was determined by testing and experience or was made up. > > > > At 10:38 AM 5/30/2010, you wrote: >>Dear Forum Members, >> >> >>NFPA 13 1999 chapter 7-3.1.3. says that >>sprinkler system criteria is intended to apply >>to buildings with ceiling slopes not exceeding 16.7 percent. >> >>What if we have warehouses with slopes of 18%, >>what should I do? Should I ask a false ceiling >>to the client? It is a lot of area, the client will not be happy with this. >> >>Warehouses Class IV Commodities >> >>Could I make any adjustment in order to avoid >>the construction of false ceiling? >> >>Please advise. >> >>Thanks so much. >> >> >> >>César Villavicencio >> >> >> >>_______________________________________________ >>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) > > Todd G. Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860.535.2080 > www.fpdc.com > > _______________________________________________ > 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) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: AFT WA 4184/AFL-CIO, SFPE, ASCET, NFPA, AFSA, NFSA AFAA, NIBS, WSAFM, WFC _______________________________________________ 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)
