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American Fire Sprinkler Association [http://www.firesprinkler.org/] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ AFSA Technical Update ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A newsletter dealing with codes and other technical issues September 19, 2012 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Concealed Combustible Space Under Pitched Roof "Is perpendicular to the slope up the slope or the other way? If I have sprinklers spaced at a maximum of 15 ft up the slope, I would then space the sprinklers at a maximum of 8 ft the other way and calculate the heads at 7 psi. I'm not quite sure which way is considered perpendicular to the slope and which way is considered parallel to the roof slope. I think parallel to the roof slope would be from the low point to the high point (peak) with the sprinkler maximum of 15 ft in this direction. Is this correct?" We have reviewed NFPA 13, 2010 edition that you indicated as the applicable standard. Our informal interpretation is that parallel to the roof slope would be from the low point to the high point (peak). Your question indicates that there may be some confusion in the application of the terms "perpendicular" and "parallel" to the slope in Table 8.6.2.2.1(a). The slope is from the eave to the peak. In a concealed space with a sloped roof greater than 4 in 12, heat from a fire will migrate quickly up the slope instead of spreading out horizontally in all directions as it would if the roof were horizontal. At normal light hazard spacing the heat from a fire located between rows of sprinklers could go up the slope to the peak and the sprinklers nearest the fire would be slow to activate, if at all. The criteria call for the sprinklers to be closer together to promote prompt activation of the sprinklers nearest the fire. For example, in an attic with A-frame wood trusses spaced at 2 ft on centers, the branch lines would be installed perpendicular to and hung from the trusses. They would be parallel to the roof peak. If the 8 x 15 ft spacing option were chosen, the lines would be 15 ft apart along the slope and the sprinklers would be 8 ft apart along the lines. This 8 ft dimension is perpendicular to the trusses, parallel to the line of the peak, and in NFPA 13's wording "perpendicular to the slope". This would allow one to choose a starting pressure necessary to deliver the density for a light hazard design. If the sprinklers are spaced perpendicular to the slope greater than 8 ft up to a maximum of 10 ft, the minimum starting pressure is 20 psi. Regarding the 5 ft minimum distance from the eave, the spacing can then be up to 7 1/2 ft from the eave if the 8 x 15 ft option is selected. There may be some confusion in applying the commentary in the handbook on section 8.6.4.1.4.3 for the sprinklers near the eave. The commentary indicates that sprinklers are required to be installed no closer than 5 ft from the intersection of the truss chords or the wood rafters and the ceiling joists so that, if the fire starts along the eave, there will be a sprinkler close to the fire. The sprinklers located near the eave will also provide protection for a fire entering the concealed space from along the eave. The commentary is referring to the sprinkler spacing parallel with the eave as being closer together and not the 5 ft minimum distance from the eave. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Counterfeit UL and ULC Marks on Pipe Hangers UL and ULC warn of counterfeit marks on fire sprinkler pipe hangers (Release 12PN-33) (Click here for a pdf version [http://r20.rs6.net/tn.jsp?e=001yDBItY4KoY-1gpbcPLfFfW4d1iCulc0i_wMnvh7cG2DQ0N6DJuiFnEQ9GDlb2-Sk4bCYHCHvg4uDa7M8EkQm2Ls5CDSiTaGJy-BZjgl4SANziQWto0HQ-4AFxVfXVxCIzJqjPHFcfWAnvGblNgxrDTphhLpVrHD6FDHtaavl35fq0QBIofpIC9VeKUXbbqKFmmqz1kL2EFQ=]) Northbrook, IL - September 15, 2012 - UL and ULC are notifying distributors, contractors, fire departments, regulatory agencies, and authorities having jurisdiction that the Fire Sprinkler Pipe Hangers identified below bears a counterfeit UL and ULC Certification Mark. The Fire Sprinkler Pipe Hanger has not been evaluated by UL or ULC to the appropriate Standards for Safety and it is unknown if the Fire Sprinkler complies with any safety requirements. Name of Product: ¾" AU-100 Identification: On the product: The product bears counterfeit UL and ULC Mark and the following information: ¾" (AU) in a circle followed by -100. Photographs of the product with counterfeit Marks: UL Press Release [http://r20.rs6.net/tn.jsp?e=001yDBItY4KoY9_qBPw_2dvrqdsnDH27En2-Xg8D956DlYlTNi1fHjBCZuox_GSC3fEsoAjgSSTSuQCC8TkkXNCrOB-buwN4xLsDkwMQJzleJ1DQw98qbo1T4xQX8q24KJp_YXguzO8s7uAgVW7bKSBUAEYUh8HS3FQF8jl6BNkyFty-VFbT7mc9wMEqsAQ3vuF4aCY7bXSW_gZtaBcfxu_ukKzAd_bmBZfSg96XsQTAxRAS6a1d5nnCiQbZWrjrZ19PkW9OV5A4dZOG2SvYvqPDLH5L3ZFkCQ0okrU4EBh2ORTq2sdOdEgSg1aom1_p2YkkUZz_2DZ8b38KrQ36D0756Huv4DvpHPzCg2jtB9z0WPrx8Q8wZE_JgnwfqDyqZWLRKl6C2JOJkQ=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ firesprinkler.org [http://r20.rs6.net/tn.jsp?e=001yDBItY4KoY_Gx9ZVUNTvzZS0SoNfDF_-9aJj8S3IkDZ2oIpSfKmCTjiHLbDQCgA5cFSnZuOpk7_IRMsZZXfbDxoh0oe0GICeDRtr89jeKxQn0lMeugU7Qg==] Hosted by the American Fire Sprinkler Association ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Technical Update is prepared by the Technical Services Dept. of the AFSA: Vice President of Engineering and Technical Services Roland Huggins, a PE registered in fire protection engineering; Phill Brown, a NICET IV certified automatic sprinkler technician and NFPA Certified Fire Protection Specialist (CFPS) and Tom Wellen, a PE registered in fire protection engineering. This is provided with the understanding that the AFSA assumes no liability for this opinion or actions taken on it and they are not to be considered the official position of the NFPA or its technical committees. Copyright 2012, American Fire Sprinkler Association. All Rights Reserved ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Download the PDF Version of Technical Update PDF Link [http://r20.rs6.net/tn.jsp?e=001yDBItY4KoY_qL7Lve6ljynrHOT2MBGzYYTsyjGKehokRPeuFbhXT3vQmGGUqEg6y6Tf-Vqr1FU21jyDf2fa78m-wPOfX2tzhsllCYZ4SVvRdGjG4uuCYhC9IUuCg3Mk66wwbp1rMiPBkOQ1AkiZQZGd9jctQJHMZt8hNMxNX58Rv8-xakOn1fJjYfqs7gSmV7XVk9LCsoa4=] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Your Calendar! 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