So the reviewer wants you to put sprinklers below the roof to protect against a potential hazard ABOVE the roof?
What would those sprinklers be protecting? I’ve seen combustible roofing hit by lightning and on fire. Amazon has had more than one occasion of a roof on fire in a fully sprinklered bldg. The building sprinklers did nothing so adding sprinklers to this assembly would also accomplish nothing. The issue is when the combustibles are within the occupied space or in connection wit the occupied space. Above the roof is not within that space. This is a common built-up roofing system used on all kinds of buildings where the space directly below is unsprinklered often because the space directly below is a ceiling cavity not requiring sprinklers. Your argument should be based around 8.15.7.3 specifically keying in on the highlighted section since the materials of construction exposed within the occupiable area in this case all meet the conditions of being non-combustible. 8.15.7.3 Sprinklers shall be permitted to be omitted from below the exterior projections of combustible construction, provided the exposed finish material on the exterior projections are non-combustible, limited-combustible, or fire retardant–treated wood as defined in NFPA 703, Also, did you get a data sheet on the insulating material to verify that it is combustible and not a limited-combustible? Craig Prahl | Jacobs | Fire Protection SME – Special Hazards | [email protected]<mailto:[email protected]> | www.jacobs.com<https://urldefense.com/v3/__http:/www.jacobs.com/__;!!KZTdOCjhgt4hgw!-_khxU8gU0_6jc895I7kRbnU8JghRDsWgqOblZ4jr7Qp2IVbR30VYw_hWvNFtphnl0uWpB9KIvbYi1pvZz4$> 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS From: Matt Grise <[email protected]<mailto:[email protected]>> Sent: Thursday, July 20, 2023 7:28 AM To: [email protected]<mailto:[email protected]> Subject: [Sprinklerforum] canopy construction Caution: This email originated from outside your organization. Please take care when clicking links or opening attachments. We have a non-combustible, light hazard building where a steel pan roof deck (with some non-combustible architectural finishes on the underside) forms a balcony over a patio. The steel roof deck has a drainage slope on top formed from combustible rigid insulation that is covered with non-combustible roofing material – forming a noncombustible-combustible-noncombustible sandwich. There are no exposed combustible materials or combustible concealed spaces since all of the materials are in direct contact. We typically see these considered non-combustible construction and exempt from sprinklers per NFPA 13 2016 ed 8.15.7.2, however a plans reviewer has expressed concerns that the presence of the combustible middle layer voids the ‘non-combustible construction’ consideration. It seems that the code allows for the presence of some combustible materials in the assembly based on NFPA 13 2016 ed 8.15.7.3 allowances for combustible construction with non-combustible finishes. However, this specific construction does not meet any of the specifically listed exemptions. Has anyone seen anything similar to this? Matt ________________________________ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer.
_________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to [email protected]
