Read Building Code - CHAPTER 7 ­ FIRE-RESISTANCE-RATED CONSTRUCTION text version

Building Code - CHAPTER 7 ­ FIRE-RESISTANCE-RATED CONSTRUCTION Section BC-701. General. This section defines the scope of this chapter as the provisions to govern the materials and assemblies used for structural fire resistance and fire-resistance-rated construction separation of spaces to safeguard against the spread of fire and smoke. 27-318 Section BC-702. Definitions. This section provides the meanings for additional terms to be used throughout this code. The current code does not explicitly provide meanings for the majority of the terms introduced in this section. Some of the defined terms in this section are similar, but not identical, to definitions provided by the current code under different terminology. Conversely, a few of the terms in this section are similar or identical to terms found in the current code, but their definitions differ. 27-320, 27-232 Section BC-703. Fire-resistance Ratings and Fire Tests. This section provides the means by which the fire-resistance ratings of building elements shall be determined. The nationally recognized ASTM E 119 standard is referenced by this section along with prescribed alternative methods for determining fire resistance. This section is equivalent to the current code, except that Section 27-322 of the current code references RS 5-1 for approved assemblies to provide the required fire-resistance ratings for specific components or assemblies. In general, the assemblies provided in RS 5-1 rely upon ASTM E 119, or the equivalent UL 263 and NFPA 251, as the baseline gauge for fireresistance ratings. This section also prescribes alternative methods to determine fire-resistance ratings. The current code provides similar alternative methods only when addressing the fireresistance ratings of structural members and assemblies in RS 5-2. 27-322, RS 5-1, RS 5-2 Section BC-704. Exterior Walls. This section provides the required fire-resistance ratings of exterior walls and opening protections therein. This section provides fire resistance rating requirements of exterior walls for buildings on the same tax lot and permits an imaginary line to be struck at any point between the buildings to establish the separation distances and determine the requisite fire-resistance ratings of the facing walls. The current code, in the definition for EXTERIOR SEPARATION, requires that the line be struck at a point halfway between the two buildings on the same lot. This difference is a major departure from the current code requirement as it will effectively allow building owners to optimize the fire-resistance ratings of both buildings to the most economically viable point rather than be limited to the requisite ratings determined by the halfway point provision.

This section permits the use of exterior wall assemblies that do not comply with the unexposed surface temperature rise limitations of ASTM E 119 when protected openings are not limited by this section or when permitted by a formula that depends upon the area of protected openings provided. The equivalent does not appear in the current code. This section provides the maximum area of exterior wall openings based on fire separation distances. The current code provides a similar provision, but has greater detail in requirements based on construction class and provides a factor applicable to the separation distance to determine the extent of the openings. This section provides a much simpler table that prescribes the area limitations, as a percentage of exterior wall area, for both unprotected and protected openings, based upon separation distances, irrespective of construction class. The permitted openings are, in general, equivalent to the current code, except that this section permits unprotected openings within separation distance of fifteen feet, whereas the current code permits an equivalent provision only for construction classes II-D and II-E. Furthermore, this section permits protected and unprotected openings within the same exterior wall and limits the permissible areas through a formulary. The equivalent does not appear in the current code. This section permits the amount of unprotected openings in exterior walls of fully sprinklered buildings to equal the permitted amount of protected openings. The equivalent provision does not appear in the current code. This section provides the vertical separation requirements for openings in exterior walls. These provisions are similar to the current code, except that this section exempts fully sprinklered buildings. This section exempts fire protective assemblies for openings in buildings protected throughout by an automatic sprinkler system and where the openings are protected with a water curtain. The equivalent does not appear in the current code. All other requirements of this section are equivalent to the current code. 27-232, 27-329, 27-331, 27-333, 27-334, 27-335, 27-340, 27-345, Table 3-4, RS 13-1 Section BC-705. Fire Walls. This section provides the requirements for fire walls, defined as fire-resistance-rated smoke tight walls, extending from foundation through roof, and offering structural stability to allow collapse of construction on either side of the wall without collapse of the wall itself. The nearest equivalent provided by the current code is termed FIRE DIVISION with very similar, but not identical, requirements. 27-232, 27-329, 27-340, 27-342, 27-345, RS 5-b, RS 13-1 Section BC-706. Fire Barriers. This section provides the requirements for fire barriers, defined as a vertical or horizontal fire-resistance-rated assembly of materials. The nearest

equivalent provided by the current code is termed FIRE SEPARATION with very similar, but not identical, requirements. 27-323, 27-339, 27-340, 27-341, 27-344, 27-521.1, 27-521.3, 27-372, Table 3-4, Table 51 Section BC-707. Shaft Enclosures. This section provides the requirements for vertical shafts where such shafts are required to protect openings and penetrations through floor/ceiling and roof/ceiling assemblies. This section permits unenclosed shafts connecting 4 stories or less in individual residential dwelling units when fully sprinklered. The current code permits unenclosed shafts connecting 3 stories or less in a J-3 occupancy irrespective of sprinklers. This section requires shaft enclosures to be of materials permitted by the building type of construction, except in Groups I-1, R-1 and R-2 buildings which are required to have shafts of noncombustible materials. The current code requires noncombustible materials for shaft enclosures in almost every instance, with the exception of Class II-E construction. This section requires 2-hour fire-resistance ratings of shaft enclosures, or 1 hour if connecting fewer than 4 stories. The current code requires 2-hour fire-resistance ratings of shaft enclosures, or 1 hour in Class II-C, II-D, and II-E construction. This section provides the requirements for shaft enclosures of refuse and laundry chutes, as well as the enclosure requirements for chute access rooms and termination rooms. The current code provides requirements of a similar scope, except that this section only requires a 2-hour fire resistance rating of shaft enclosures, whereas the current code places much more stringent requirements as to the permitted materials and type of construction. Furthermore, this section will permit smaller chute access rooms, under certain conditions, than that required by the current code. All other requirements of this section are equivalent to the current code. 27-344, 27-836, RCNY 24-01, Table 3-4 Section BC-708. Fire Partitions. This section provides the requirements for fire partitions, defined as a vertical assembly of materials, in which openings are protected, designed to restrict the spread of fire. This section explicitly states that the requirements provided apply only to walls separating tenant spaces in covered mall buildings and to interior corridor walls. The current code does not explicitly regulate a similar scope. The nearest equivalent in the current code is found in the requirements for FIRE SEPARATION, where such fire separation is not required to continue through concealed spaces. 27-341, Table 5-1

Section BC-709. Smoke Barriers. This section provides the requirements for smoke barriers, defined as a continuous membrane designed to restrict the movement of smoke. The current code uses the identical term SMOKE BARRIER for slightly different requirements. Though the current code equivalently applies the term to membranes restricting the flow of smoke, the current code does not distinguish between smoke barriers that provide a fire-resistance rating versus those that do not provide a fireresistance rating. This section specifies that membranes restricting the flow of smoke shall provide a 1-hour fire-resistance rating to be considered a smoke barrier. All other provisions of this section are equivalent to the current code. 27-353.3, 27-369(c) Section BC-710. Smoke Partitions. This section provides the requirements for smoke partitions, defined as a continuous membrane designed to restrict the movement of smoke and generally not required to provide a fire-resistance rating. The current code uses the identical term SMOKE BARRIER for slightly different requirements. Though the current code equivalently applies the term to membranes restricting the flow of smoke, the current code does not distinguish between smoke barriers that provide a fireresistance rating versus those that do not provide a fire-resistance rating. This section specifies that membranes restricting the flow of smoke need not provide any fireresistance rating to be considered a smoke partition. All other provisions of this section are equivalent to the current code. 27-353.3, 27-369(c) Section BC-711. Horizontal Assemblies. This section provides the requirements for floor and roof assemblies required to have a fire-resistance rating. The current code does not distinguish between vertical versus horizontal fire-rated construction, and instead regulates vertical and horizontal fire-rated construction collectively. All other provisions of this section are equivalent to the current code. 27-327, 27-338(d), 27-339, 27-340, 27-341, 27-342, Table 3-4, TPPN 8/92 Section BC-712. Penetrations. This section provides the requirements for materials and construction methods used to protect through penetrations and membrane penetrations. The current code regulates an equivalent scope of requirements and references the same nationally recognized standards. However the details provided by this section are not identical to those found in the current code, though the degrees of deviation are not substantial enough to materially affect construction practices.

This section provides the requirements for floor fire doors. The current code does not provide an equivalent requirement except to the extent to which it regulates openings protective in fire-resistance rated floor construction. 27-327(b), 27-343, 27-345, RS 5-19 Section BC-713. Fire-resistant Joint Systems. This section provides the requirements for joints installed in or between fire-resistance rated walls, floors, ceilings, and roofs to be protected by an approved fire-resistant joint system. The current code does not provide an equivalent requirement, nor does the current code reference the same nationally recognized standards, ASTM E 1966 and UL 2079 which specifically address fire-resistive joint systems. Section BC-714. Fire-resistance Rating of Structural Members. This section provides the fire-resistance requirements of structural members and assemblies. This section is largely equivalent to the current code, with the exception that this section regulates the fire-resistance requirements of seismic isolation systems, whereas the current code does not provide any equivalent requirement. 27-323, 27-324, 27-326, Table 3-4 Section BC-715. Opening Protectives. This section provides the requirements for openings in fire-resistance rated construction. The equivalent scope of requirements is addressed by the current code. This section cites different nationally recognized standards than does the current code, but the standards are equivalent in scope and prescribed levels of safety. This section is largely equivalent to the current code. Though the exact dimensions of permitted openings and degrees to which openings are required to offer protection may not necessarily be identical, this section is equivalent to the current code in levels of safety prescribed and general scope. 27-329, 27-342, 27-371, RS 5-6, R 5-7, RS 5-8 Section BC-716. Ducts and Air Transfer Openings. This section provides the requirements for the protection of ducts and air transfer openings in fire-resistance-rated assemblies. This section is equivalent to the current code in scope. However, the nationally recognized standards cited are not identical to those referenced by the current code, although similar levels of safety are addressed by the different standards. This section provides the requirements for fire dampers and smoke dampers in ducts that penetrate fire-rated assemblies, and organizes such requirements according to the type of assembly, such as fire wall, fire barrier, fire partition, shaft, etc. This section requires smoke dampers only in fire walls and public corridor walls constructed as fire barriers. The current code requires smoke dampers in any wall with a fire resistance rating of 2 hours or more with equivalent exceptions for ducts in smoke control systems and J-2 occupancies.

This section requires ducts penetrating horizontal assemblies to be equipped with a fire damper and fire blocking when not enclosed in a shaft. The equivalent appears in the current code. However, this section exempts ducts serving a dwelling unit and penetrating not more than 3 floors. The current code does not provide an equivalent exception. This section restricts flexible ducts and air connectors from penetrating fire-rated assemblies. The equivalent does not appear in the current code. 27-343, 27-777.1, RS 13-2(2-3.4.2), RS 13-1 (3-3.1, 3-3.2, 3-3.5) Section BC-717. Concealed Spaces. This section provides the requirements for fire blocking and draft stopping of concealed locations wall and floor construction. Though the provisions of this section are very similar to the requirements of the current code for FIRESTOPPING, it should be noted that this section uses the term "fireblocking" differently than the current code use of the term "firestopping" , and the Proposed Code use of the term "firestop" is not applied to an equivalent scope as the current code. The Proposed Code draws a distinction between "fireblock" and "firestop" based upon requisite fire-resistance. The current code does not make an equivalent distinction in terminology and applies the term "firestopping" in applications not requiring fireresistance ratings. This section provides requirements for draft stopping concealed spaces in combustible construction. The current code does not address a similar concept, nor does it provide a distinction between fire stopping and draft stopping. 27-345, 27-351 Section BC-718. Fire-resistance Requirements for Plaster. This section provides the material and installation requirements for fire-rated plaster applications. The current code addresses fire-resistant plaster applications in the Reference Standards which cites "Fire Resistance Ratings" AISG-1985 and prescribes plaster mixes and application techniques to achieve specific fire ratings expressed in hours. RS 5-1A Section BC-719. Thermal and Sound Insulating Materials. This section provides the flame spread and smoke-developed limitations for insulating materials and their application requirements. This section is equivalent to the current code, though this section is more comprehensive in scope. 27-335.1, 27-337(c), 27-881, RS 5-5 Section BC-720. Prescriptive Fire Resistance. The provisions of this section contain prescriptive details of fire-resistance-rated building elements. Extensive details are provided in three tables, organized according element: structural, walls and partitions,

and floor and roof systems. The equivalent appears in the Reference Standards of the current code referring to AISG 1985 Fire Resistance Ratings, which provides equivalent prescriptive details in similar format. RS 5-1A Section BC-721. Calculated Fire Resistance. The provisions of this section contain procedures by which the fire resistance of specific materials or combinations of materials is established by calculations. These procedures apply only to the information contained in this section and are not to be otherwise used. The equivalent appears in the Reference Standards of the current code referring to nationally recognized standards. RS 5-1B, RS 5-1C, RS 5-1D, RS 5-1E, RS 5-1F

Information

Building Code - CHAPTER 7 ­ FIRE-RESISTANCE-RATED CONSTRUCTION

7 pages

Find more like this

Report File (DMCA)

Our content is added by our users. We aim to remove reported files within 1 working day. Please use this link to notify us:

Report this file as copyright or inappropriate

323538


You might also be interested in

BETA
Specification for Structural Joints Using ASTM A325 or A490 Bolts
14FZ.fm.save
Microsoft Word - 30130630.doc
Anixter Wire & Cable Technical Information Handbook