Let me explain this project a little more, because I think I'm being misunderstood. We are sprinklering a new addition of a sawmill production floor. There is a lower floor and a main floor in the new addition. On the main floor of the addition there is a mezzanine. The mezzanine has a solid floor, and is completely open to the surrounding area (above and below). So essentially, in one room, over one floor area, we have two areas being sprinklered. The first is below the mezzanine. The second is at the roof deck. The area of the roof deck will not meet the square footage requirements of my extra hazard occupancy (3250 sqft. with dry penalty). So my question is, do I need to calculate heads under the mezzanine to meet my square footage requirements, or will a calc of the heads at the roof deck be sufficient.
Jimmy Waite Burtell Fire Protection, Inc. [EMAIL PROTECTED] 406-652-7697 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jimmy Waite Sent: Monday, March 26, 2007 1:54 PM To: [email protected] Subject: Mezzanine Calcs. Dear Forum, We are currently working on a project where we are tying onto a dry, gridded sprinkler system, installed in 1985. There are two existing dry systems and they each cover an area of about 13,100 square feet. The lower floor is a tree system that was sized by "Table 3-7.1" of NFPA 13, 1984 Ed. The main floor is a grid that was designed at a .275/ 3000 square feet with 500 gpm hose allowance. The addition that we are sprinklering is only 2,000 square feet. On the main floor of the addition there is a mezzanine of about 1,000 square feet. Is a calculation even needed for such a small addition, or can we use the existing pipe sizing as our guide? If a calculation is required, would we calculate the sprinklers along the roof deck by themselves, or do we need to include the sprinklers under that mezzanine in our calculations as well. Thanks for the help Jimmy Waite Burtell Fire Protection, Inc. [EMAIL PROTECTED] 406-652-7697 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
