Committee Input No NFPA [ New Section after ]

Transcription

1 of /26/2015 1:41 PM Committee Input No NFPA [ New Section after ] Add new Sections as follows Vertical and Lateral Flame Propagation on Exterior Nonbearing Walls Exterior nonbearing walls tested shall be permitted when tested in accordance with, and meeting the conditions of acceptance of either one of the following: A. NFPA 285, Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components ; or B. ANSI/FM 4880, American National Standard for Evaluating Insulated Wall or Wall and Roof/Ceiling Assemblies, Plastic Interior Finish Materials, Plastic Exterior Building Panels, Wall/Ceiling Coating Systems, Interior or Exterior Finish Systems, Exterior walls other than those listed in and on buildings of Type I, II, III or IV construction that are greater than 40 feet ( mm) in height above grade plane and contain a combustible water-resistive barrier shall be tested in accordance with and comply with the acceptance criteria of NFPA 285. For the purposes of this section, fenestration products and flashing of fenestration products shall not be considered part of the water-resistive barrier Walls in which the water-resistive barrier is the only combustible component and the exterior wall has a wall covering of brick, concrete, stone, terra cotta, stucco or steel with corresponding minimum thicknesses Walls in which the water-resistive barrier is the only combustible component and the water-resistive barrier has a peak heat release rate of less than 150 kw/m2, a total heat release of less than 20 MJ/m2 and an effective heat of combustion of less than 18 MJ/kg as determined in accordance with ASTM E1354 and has a flame spread index of 25 or less and a smoke-developed index of 450 or less as determined in accordance with ASTM E 84 or UL 723. The ASTM E 1354 test shall be conducted on specimens at the thickness intended for use, in the horizontal orientation and at an incident radiant heat flux of 50 kw/m2 Submitter Information Verification Submitter Full Name: Robert Solomon Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Tue Aug 11 13:54:44 EDT 2015 Committee Statement and Meeting Notes Committee Statement: Similar test provisions have been added in Chapter 7 of NFPA 5000-See FR Adding similar requirements in Chapter 37 is needed so as to make sure the related provisions are captured in both areas. For the second draft meetings, the two committees (BLD-BLC and Page 1 of 12

2 of /26/2015 1:41 PM BLD-SCM) should determine if further correlation is needed between the two chapter before the Chapter 37 requirements are finalized. Response Message: This CI introduces some basic language that will allow the committee to continue to work on the needed requirements. Public comment on this subject is also being specifically solicited so as to allow as much relevant information to be brought to bear on the subject. Page 2 of 12

3 Committee Input No NFPA [ New Section after ] Vegetative Green Roofs Vegetative green roofs shall be tested in accordance with FM * The design of vegetative green roofs with regard to dead, live, rain, snow, earthquake and wind load, in accordance with Chapter 35, and the fire protection design shall be approved Provide plantings based on the appropriate hardiness zone in accordance with USDA MP 1475 and that are capable of withstanding the micro-climate of the roof Aggregate types- The size and type of aggregate shall be appropriate. ( Action Item to follow with regard to windborne debris ). A Guidance regarding the design of vegetative green roofs related to dead, live, rain, snow, earthquake, and wind loads and fire can be found in FM Global Data Sheet Submitter Information Verification Submitter Full Name: Robert Solomon Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Tue Aug 11 09:30:09 EDT 2015 Committee Statement Committee Statement: Response Message: A new section has been recommended for addition into Chapter 38 dealing with green/vegetative roofs. As these systems become more prolific, the challenges they introduce to building design, maintenance and upkeep and operational difficulties that can be encountered during fire suppression operations need to be considered. This CI introduces some basic language that will allow the committee to continue to work on the needed requirements. Public comment on this subject is also being specifically solicited so as to allow as much relevant information to be brought to bear on the subject. Page 3 of 12

4 Committee Input No NFPA [ New Section after ] 38.13* Roof Mounted Solar Photovoltaic Panels Fire Protection Requirements * Rigid roof mounted photovoltaic solar modules and the roof assembly they are to be mounted over shall be tested for exterior fire exposure in accordance with one of the following: a) FM 4478, or b) UL Flexible photovoltaic modules that are adhered to the roof substrate shall be tested in accordance with FM * Roof expansion joints shall be protected using a galvanized steel, zinc-aluminum coated steel or stainless steel flashing. Noncombustible, compressible insulation shall be installed between nailers for expansion joints and within other joints penetrating the roof assembly * Solar photovoltaic panels shall not be installed on roofs that do not require an exterior fire exposure rating. A This includes the use of unclassified wood shake roofing systems * Solar photovoltaic systems shall be installed in accordance with NFPA 70. A Significant changes have been proposed for NFPA 70, 2017 edciton that affect first responders related to rapid shutdown controls and subsequent reduced voltage output) Solar photovoltaic systems shall be installed in accordance with NFPA 1. A This includes, but is not limited to the provision of minimum 4 ft aisles every 100 ft, labelling to tell first responders exactly what is being shutdown and what the resulting voltages will be in various locations (within or outside the array) Wind Design All solar photovoltaic modules shall be designed to meet wind loads in accordance with Chapter Wind resistance for rigid roof mounted photovoltaic solar modules shall be in accordance with SEAOC PV2 or ASCE/SEI Where atmospheric boundary layer wind tunnel (BLWT) tests are used to determine wind resistance, the BLWT tests shall be in accordance with ASCE/SEI Wind resistance for flexible photovoltaic solar modules shall be in accordance with FM Earthquake Design All solar photovoltaic modules shall be designed to resist earthquake loads in accordance with Chapter Seismic resistance for rigid roof mounted photovoltaic solar modules shall be in accordance with SEAOC PV1. A Additional guidance regarding the design of roof mounted solar photovoltaic modules related to gravity loads, wind loads, earthquake loads, hail and fire can be found in FM Global Data Sheet A A number of severe exterior fires have occurred involving roof mounted solar panels and the roof assembly they are mounted over. These fires generally involve combustible above Page 4 of 12

5 deck roof components and combustibles present on the underside of the PV panels, including polymeric back-sheets and adhesives. The presence of the PV modules on the roof adversely affects the fire dynamics of an exterior roof fire. Potential fire spread can be reduced by using roof components that provide limited fuel contribution. This could include coatings over the roof cover or roof covers that offer limited combustibility, as well as the use of noncombustible insulations or minimum ¼ in. (6 mm) thick, unfaced or glass faced gypsum cover boards over other insulation types. While roof aggregate would improve performance against exterior fire spread, it could be windborne debris during a design wind event and damage the PV modules. In the most severe fire that occurred, the fire spread into the building, destroying almost all of it. Consequently, the protection of joints penetrating the roof assembly is a key factor. A See Fig. A for an example of a roof expansion joint that is protected using a galvanized steel, zinc-aluminum coated steel or stainless steel flashing with noncombustible, compressible insulation installed between nailers. To view similar details, see the NRCA Roofing Manual: Membrane Roof Systems. Insert Fig. A [[[[[[see attached]]]]]]]]] H ASCE Publications ASCE/SEI 49, Wind Tunnel Testing for Buildings and Other Structures, H FM Global Publications (add the following): FM Global Property Loss Prevention Data Sheet 1-15, Roof Mounted Solar Photovoltaic Panels, FM Global Property Loss Prevention Data Sheet 1-35, Green Roofs, FM 4476, Approval Standard for Flexible Photovoltaic Modules, FM 4477, Approval Standard for Vegetated Roof Systems, FM 4478, Approval Standard for Rigid Photovoltaic Modules, H Structural Engineers Association of California (SEAOC), th Street, Suite 303, Sacramento, CA SEAOC PV1, Structural Seismic Requirements and Commentary for Rooftop Solar Photovoltaic Systems, SEAOC PV2, Wind Design for Low-Profile Solar Photovoltaic Arrays on Flat Roofs, H UL Publications UL 2703, Standard for Safety for Mounting Systems, Mounting Devices, Clamping/Retention Devices, and Ground Lugs for Use with Flat-Plate Photovoltaic Modules and Panels, 2015 H U.S. Government Publications U.S. Department of Agriculture, USDA Miscellaneous Publications, MP 1475, Plant Hardiness Zone Map, H.2 Informational References National Roofing Contractors Association (NRCA), Roofing Manual: Membrane Roof Systems, Action Items: Add UL fire research reports, title for UL 2703 in Annex H, reference to NFPA 1 and additional fire dept. concerns Supplemental Information File Name A jpg Description Figure to add to A the term "compressible mineral wool insulation" needs to be changed to "noncombustible compressible insualation". Page 5 of 12

6 Submitter Information Verification Submitter Full Name: Robert Solomon Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Tue Aug 11 09:43:12 EDT 2015 Committee Statement Committee Statement: Response Message: A new section has been recommended for addition into Chapter 38 dealing with photovoltaic systems on roofs. As these systems become more prolific, the challenges they introduce to building design, maintenance and upkeep and operational difficulties that can be encountered during fire suppression operations need to be considered. This CI introduces some basic language that will allow the committee to continue to work on the needed requirements. Public comment on this subject is also being specifically solicited so as to allow as much relevant information to be brought to bear on the subject. The language the CI offers installation provisions and flags some of the concerns that need t be evaluated for PV installation. During this discussion, a question was raised with regard to ground mounted PV arrays and if that arrangement is adequately covered in the code. Page 6 of 12

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8 Committee Input No NFPA [ Section No ] A vapor retarder having a perm rating not exceeding or a 6 10 mil ( mm) thickness of polyethylene shall be placed between the top of the subgrade or base material and the bottom of the slab. Submitter Information Verification Submitter Full Name: Robert Solomon Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Wed Jul 29 15:44:55 EDT 2015 Committee Statement Committee Statement: Response Message: Based on ACI 302, 1996, a recommended thickness of 10 mil (0.25 mm) polyethylene is recommended for the vapor retarder. The 0.1 perm rating is consistent with the IBC. Page 8 of 12

9 Committee Input No NFPA [ New Section after A ] Add the following to the Annex for Chapter 35 (means of egress): A Where additional protection is proposed for occupants from storms, such as tornadoes, tropical storms, etc.; stairwells should be hardened using reinforced concrete or masonry construction throughout with normally closed and latched egress doors. Where windows, shutters or alternative wall construction is proposed, assemblies should be tested as outlined below. Ideally, tornado-resistant assemblies should be able to withstand the impact from a 15 lb. (6.8 kg), wood, nominal 2 x 4 in. (50 x 100 mm) member impacting at 100 mph (45 m/s). Assemblies such as windows that could pass such a test are not commonly available commercially, or may not be economically practical to use for buildings other than shelters. The weight and impact speed stated above for tornado-resistant assemblies is considerably greater than that used in large windborne debris impact tests as described in ASTM E1886 and ASTM E1996. Some level of protection may be provided by using assemblies that passed tests that used Level E (preferably) or Level D impact (see Table A.35.13). This could include assemblies such as windows or shutters, or alternative wall construction. Table A ASTM E1886/E1996 Impact Test Criteria for Large Windborne Debris Windborne Debris Level Simulated Debris Impact Speed D E 9 lb /-0.25 lb (4100 g /- 100 g), nominal 2 x 4 in. x 8 ft /- 4 in. (2.4 m /- 100 mm) lumber 9 lb / lb (4100 g /- 100 g), nominal 2 x 4 in. x 8 ft /- 4 in. (2.4 m /- 100 mm) lumber 50 ft/s, 34 mph, 15.3 m/s 80 ft/s, 55 mph, 24.4 m/s Add the following to Annex H: H ASTM Publications (add the following): ASTM International. ASTM E a, Standard Test Method for Performance of Exterior Windows, Curtain Walls, Doors and Storm Shutters Impacted by Missile(s) and Exposed to Cyclic Pressure Differentials. ASTM E a, Standard Specification for Performance of Exterior Windows, Curtain Walls, Doors and Storm Shutters Impacted by Windborne Debris in Hurricanes. H.X FEMA Publications (add new section including FEMA address and the following publications): FEMA P-320. Federal Emergency Management Agency (FEMA). Taking Shelter from the Storm: Building a Safe Room for Your Home or Small Business.. FEMA P-361.Federal Emergency Management Agency (FEMA). Design and Construction Guidance for Community Safe Rooms. ICC/NSSA 500, Standardfor the Design and Construction of Storm Shelters 2013 Submitter Information Verification Page 9 of 12

10 of /26/2015 1:43 PM Committee Input No NFPA [ New Section after A.37.3 ] A.37. Storm Shelters To provide temporary shelter from storms such as tornadoes, tropical storms, etc., a safe room should be constructed. Construction of safe rooms up to 14 by 14 ft (196 ft 2 ; 4.27 by 4.27 m; 18.2 m 2 ) and for up to 39 occupants should be in accordance with FEMA 320. Where the facility is to serve a larger number of occupants, such as a community safe room, construction should be in accordance with FEMA 361. For addition information, see ICC/NSSA 500, Standard for the Design and Construction of Storm Shelters, Add the following to Annex H: H ASTM Publications (add the following): ASTM International. Standard Test Method for Performance of Exterior Windows, Curtain Walls, Doors and Storm Shutters Impacted by Missile(s) and Exposed to Cyclic Pressure Differentials. ASTM E a. ASTM International. Standard Specification for Performance of Exterior Windows, Curtain Walls, Doors and Storm Shutters Impacted by Windborne Debris in Hurricanes. ASTM E a. H.X FEMA Publications (add new section including FEMA address and the following publications): Federal Emergency Management Agency (FEMA). Taking Shelter from the Storm: Building a Safe Room for Your Home or Small Business. FEMA P-320. Federal Emergency Management Agency (FEMA). Design and Construction Guidance for Community Safe Rooms. FEMA P-361. H.X.1 ICC Publications ICC/NSSA 500, Standard for the Design and Construction of Storm Shelters, Submitter Information Verification Submitter Full Name: Tracy Vecchiarelli Organization: National Fire Protection Assoc Street Address: City: State: Zip: Submittal Date: Wed Aug 12 12:06:27 EDT 2015 Committee Statement and Meeting Notes Committee Statement: In the NIST, NCST study on the Joplin, MO tornado [NIST NCSTAR 3, Technical Investigation of the May 22, 2011 Tornado in Joplin, Missouri], one area of study relates to storm shelters. The NIST report asked for code organizations to address that hazard scenario and determine what solutions in codes might be feasible. This input addresses that Page 10 of 12

11 of /26/2015 1:43 PM scenario and makes reference to the appropriate FEMA and private sector standards for storm shelter design. Response Message: This CI introduces some basic language that will allow the committee to continue to work on the needed requirements. Public comment on this subject is also being specifically solicited so as to allow as much relevant information to be brought to bear on the subject. Page 11 of 12

12 Submitter Full Name: Robert Solomon Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Tue Aug 11 10:42:49 EDT 2015 Committee Statement Committee Statement: Response Message: In the NIST, NCST study on the Joplin, MO tornado [NIST NCSTAR 3, Technical Investigation of the May 22, 2011 Tornado in Joplin, Missouri], one area of study relates to exit stairs located on exterior walls that had sustained severe damage and that were compromised by the tornado. The NIST report asked for code organizations to address that hazard scenario and determine what solutions in codes might be feasible. This input addresses that scenario and makes reference to the appropriate ASTM standards that can be used to test glazing and other openings in the wall and their ability to withstand debris impact. This CI introduces some basic language that will allow the committee to continue to work on the needed requirements. Public comment on this subject is also being specifically solicited so as to allow as much relevant information to be brought to bear on the subject. Page 12 of 12