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RA 6541: National Building Code of the Philippines

by Administrator

 


REPUBLIC ACT NO. 6541

AN ACT TO ORDAIN AND INSTITUTE

A NATIONAL BUILDING CODE OF THE PHILIPPINES

 

TITLE 1 - ADMINISTRATIVE

Chapter 1.01 - GENERAL PROVISIONS

SECTION 1.01.01: Title

 

(a) This Act shall be known as the "National Building Code of the Philippines" and shall hereinafter be referred to as the "Code".

 

SECTION 1.01.02: Declaration of Policy

 

(a) It is hereby declared to be the policy of the State to safeguard life, health, property, and public welfare, consistent with the principles of environmental management and control; and to this end, make it the purpose of this Code to provide for all buildings and structured, a framework of minimum standards and requirements by guiding, regulating, and controlling their location, siting, design, quality of materials, construction, use, occupancy, and maintenance, including their environment, utilities, fixtures, equipment, and mechanical electrical, and other systems and installations.

 

SECTION 1.01.03: Scope

 

(a) The provisions of this Code shall apply to the design, location, siting, construction, alteration, repair, conversion, use, occupancy, maintenance, moving, and demolition of, and addition to, public and private buildings and structures.

 

(b) Additions, alterations, repairs, and changes of use or occupancy in all buildings and structures shall comply with requirements for new buildings and structures except as otherwise herein provided. Only such portion or portions of the existing building or structure which have to be altered to effect the addition, alteration, or repair shall be made to conform to the requirements for new buildings or structures. Alterations should preserve the aesthetic value of the building to be altered.

 

(c) Where, in any specific case, different section of this Code specify different materials, methods of construction, or other requirements, the most restrictive shall govern.

 

SECTION 1.01.04: Application

 

(a) This Code shall apply to all buildings and structures constructed and any change or repair made thereon after the approval of said Code. Buildings or structures constructed before the approval of this Code shall not be affected thereby; Except, where their continued use or occupancy is dangerous to life or limb; or where alterations, additions, conversions, or repairs are to be made thereon, this Code shall apply only to such portions of the buildings or structure which have to be altered in order to effect such damages or repairs.

 

(b) This Code shall apply to chartered cities, poblaciones of municipalities and municipal districts with a population of at least two thousand (2,000) inhabitants, and to barrios of urban areas with a population of at least two thousand (2,000) inhabitants. This Code shall also apply to any area where there are fifty (50) or more families per hectare.

 

(c) This Code shall likewise apply to any area proposed for or being developed into a new town site, residential subdivision, commercial or residential site, school site, housing project, and similar construction projects where five or more buildings not covered by paragraph (d) of this

 

Section will be constructed even if the poblacion or barrio population is less than two thousand (2,000) or the density of population is less than fifty (50) families per hectare.

 

(d) The design and construction requirements of this Code shall not apply to any traditional indigenous family dwelling costing not more than five thousand pesos (P5,000.00) and intended for use and occupancy of the family of the owner only. The traditional type of family dwellings are those that are constructed of native materials such as bamboo, nipa, logs, or lumber, wherein the distance between vertical supports or suportales does not exceed 3.00 meters (10 feet); and if masonry walls or socalos are used, such shall not be more than 1.00 meter (3 feet, 3 inches) from the ground: Provided, however, That such traditional indigenous family dwelling will not constitute a danger to life or limb of its occupants or of the public; will not be fire hazard or an eyesore to the community; and does not contravene any fire zoning regulation of the city or municipality in which it is located. chan robles virtual law library

 

(e) Notwithstanding paragraph (d) of this Section, this Code shall apply to Group A dwellings produced on a commercial scale and intended for use by the general public.

 

SECTION 1.01.05 Building Use Affecting Public Health and Safety

 

(a) Any building or structure, or any ancillary or accessory facility thereto, and any alteration or addition to any building or structure already existing, shall conform in all respects to the principles of safe construction, shall be suited to the purpose for which the building is designed, and shall, in no case contribute to making the community in which it is located at eyesore, a slum, or a blighted area.

 

(b) Adequate environmental safeguards shall be observed in the design, construction, and use of any building or structure for the manufacture and production of any kind of article or product which constitutes a hazard or nuisance affecting public health and safety, such as explosives, gas, noxious chemicals, inflammable compounds, or the like.

 

SECTION 1.01.06: Maintenance

 

(a) All buildings or structures, both existing and new, and all parts thereof shall be maintained in a safe and sanitary condition. All devices or safeguards, which are required by this Code in a building or structure when constructed, altered, or repaired, shall be maintained on good working order.

 

SECTION 1.01.07: Insanitary, Unsafe, Hazardous, or Dangerous Sites

 

(a) The land or site upon which will be constructed any building or structure, or any ancillary or auxillary facility thereto, shall be sanitary , hygienic or safe. Where the land or site is polluted, insanitary, unhygienic, unsafe, or hazardous, conditions contributing to or causing its being polluted, insanitary, unhygienic, unsafe, or hazardous shall be reasonably improved or corrected, or proper remedial measures shall be prescribed or incorporated in the design or construction of the building or structure in accordance with the provisions of this Code.

 

(b) The land or site upon which be constructed a building of structure or any ancillary or accessory facility thereto, for use of human habitation or abode, shall be at a safe distance from streamers or bodies of water and/source of air considered to be polluted, volcano or volcanic site, and building or structure considered to be a potential source of fire or explosion, such as ammunitions factory or dump and storage place for highly inflammable material.

 

SECTION 1.01.08: Dangerous and Ruinous Buildings or Structures

 

(a) General. - The provisions of this Code shall apply to all dangerous buildings, as herein defined, which are now in existence or which may hereafter be constructed, as well as to ruinous buildings as defined in Article 482 of the Civil Code of the Philippines. chan robles virtual law library

 

(b) Dangerous Buildings Defined. - Dangerous buildings are those which are structurally unsafe or not provided with safe egrees, or which constitute a fire hazard, or are otherwise dangerous to human life, or which in relation to existing use constitute a hazard to safety or health or public welfare, by reason of inadequate maintenance, dilapidation, obsolescence, fire hazard, or abandonment; or which otherwise contribute to the pollution of the site or the community to an intolerable degree. Any building or structure which has any or all of the conditions or defects hereinafter described, or conditions or defects similar thereto, shall be deemed to be dangerous building: Provided, That such conditions or defect exists to the extent that the life, health, property, or safety of the public or its occupant are endangered:

 

(1) Whenever any door, aisle, passageway, stairway, or other means of exist is not of sufficient width or size, or is not so arranged as to provide safe and adequate means of exit in case of fire or panic;

 

(2) Whenever the stress in any materials member or portion thereof, due to all dead and live loads is more than one and one-half times the working stresses or stresses allowed in this Code for new building of similar structure, purpose, or location: Provided, That in determining working stress, the working stress method of analysis shall be used, and in the case of engineering "overstress", the ultimate strength method;

 

(3) Whenever any portion thereof has been damaged by fire, earthquake, wind, flood, or by any other cause, to such an extent that the structural strength or the stability thereof is materially less than it was before such catastrophe and is less than the minimum requirements of this Code for new buildings of similar structures, purpose, or location;

 

(4) Whenever any portion or member or appurtenance thereof is likely to fall, or to become detached or dislodged, or to collapse and thereby injure persons or damage property;

 

(5) Whenever any portion or member or any appurtenance or ornamentation of the exterior thereof is not of such sufficient strength or stability, or is not so anchored, attached, or fastened - place so as to be capable of resisting a wind pressure of one-half of that specified in this Code for new buildings of similar structure; purpose, or location without exceeding the working stresses permitted for such buildings;

 

(6) Whenever any portion thereon has wracked, warped, buckled, or settled to such an extent that walls or other structural portions have materially less resistance to winds or earthquake than is required in the case similar new construction;

 

(7) Whenever the building or structure, or any portion thereof, because of: (i) dilapidation, deterioration, or delay; (ii) faulty construction; (iii) the removal, movement, or instability of any portion of the ground necessary for the purpose of supporting such building; (iv) the deterioration, decay, or inadequacy of its foundation; or (v) any other cause, is likely to partially or completely collapse;

 

(8) Whenever, for any reason, the building or structure, or any portion thereof, is manifestly unsafe for the purpose for which it is being used;

 

(9) Whenever the exterior walls or other vertica structural members list, lean, or buckle to such an extent that the structure falls within the condition described in the preceding subparagraph (2), above, or whenever any portion thereof suffers a material reduction of the fire and weather resistance qualities of characteristics required by this Code for newly constructed buildings of like area, height, and occupancy in the same location;

 

(10) Whenever a building or structure, used or intended to be used for dwelling purposes, because of inadequate maintenance, dilapidation, decay, damage, faulty construction or arrangement, inadequate light, air, or sanitation facilities, or otherwise, is found to be unsanitary, unfit for human habitation, or in such a condition that is likely to cause sickness or disease; chan robles virtual law library

 

(11) Whenever any building or structure, because of obsolescence, dilapidated, condition, deterioration, damage, inadequate exists, lack of sufficient fire-resistive construction, or other cause, is found to be a fire hazard;

 

(12) Whenever any portion of a building or structure remains on a site after demolition or destruction of the building or structure is abandoned for a period in excess of six months, so as to constitute a nuisance or hazard to the public;

 

(13) Whenever any building or structure is in such a condition as to constitute a public nuisance defined in Article 694 and 695 of the Civil Code of the Philippines.

 

(c) Abatement of Dangerous Buildings. In all cases of dangerous buildings, except those covered by Article 482 and 694 to 707 of the Civil Code of the Philippines, the Building Official shall order their repair, vacation, or demolition in accordance with the following procedure:

 

(1) Where the dangerous building can reasonably be repaired such that it will no longer be dangerous, it shall be ordered repaired;

 

(2) Where the dangerous building is such that to repair it would cost more than 50 per cent of the current to replacement cost of the building, it shall be repaired or demolished at the opinion of the owner;

 

(3) Where the dangerous building poses an immediate threat to life, limb, or property, it shall be vacated immediately, then repaired or demolished in accordance with subparagraphs (1) or (2) herein.

 

SECTION 1.01.09. Alternate or new Design, Material, Method of Construction, or Workmanship; Tests:

 

(a) Any design, material, method of construction, or workmanship not specifically included in this Code may be used: Provided, That such alternate or new design, material, method of construction, or workmanship is at least the equivalent of those prescribed in this Code in effectiveness.

 

(b) Tests for design, materials, method of construction, or workmanship shall be prescribed by the Secretary of Public Works and Communication in appropriate rules and regulations therefor.

 

SECTION 1.01.10: Municipal and Provincial Ordinances and Regulations

 

(a) Local ordinances should conform to the Code and suppletory requirements hereto shall in no case diminish minimum requirements embodied in this Code. The Secretary of Public Works and Communications or, in the proper case, the Secretary of Justice shall take any and all appropriate steps in cases where local ordinances conflict with the Code.

 

SECTION 1.01.11: Definitions and Tables

 

(a) The definitions in Annex A and the Tables in Annex B of this Code are hereby adopted as part thereof.

  

SECTION 1.01.12: Separability Clause

 

(a) If, for any reason, any section or provision of this Code shall be declared unconstitutional or invalid, no other section or provision of this Code shall be affected thereby.

 

SECTION 1.01.13: Repealing Clause

 

(a) Any and all statutes, orders, ordinances, rules and regulations or parts thereof, inconsistent with the provisions of this Code, are hereby repealed or modified accordingly.

 

SECTION 1.01.14: Effectivity

 

(a) This Code shall take effect upon its approval within the Greater Manila Metropolitan Area and in other areas where there are already existing local building codes, and four (4) years thereafter, in all other areas in the Philippines: Provided, however, That this provision shall not prevent any city or municipal council or board from adopting this Code immediately upon its approval.

 

Chapter 1.02 - ENFORCEMENT

 

SECTION 1.02.01: Joint Building and Environmental Planning Research and Standards Commission

 

(a) Membership. There is hereby created a Joint Building and Environmental Planning Research and Standards Commission composed of two Senators, two Congressmen, and five other members to be appointed by the President of the Philippines. The members shall elect a Chairman from among themselves.

 

(1) The President of the Senate shall designate the chairman of the Committee on Housing, Urban Development and Resettlement and one Senator from the minority party as members of the Commission.

 

(2) The Speaker of the House of Representatives shall designate the Chairman of the Committee on Housing and one Congressman from the minority party as members of the Commission.

 

(3) The President of the Philippines shall appoint two architects, two engineers, and one building contractor chosen from those officially recommended by their respective national professional organizations, to serve for four years or until their successors shall have been duly appointed and qualified.

 

(4) The members thereof shall serve without compensation: except, That the members from the professional organizations may receive a per diem of one hundred pesos (P100.00) each per meeting actually attended: Provided, That the total per diem the members may receive shall not exceed six hundred pesos (P600.00) per month. A monthly transportation allowance of two hundred fifty pesos (P250.00) shall be granted each of the members from the professional organizations.

 

(b) Duties and Responsibilities. The Commission shall have the following duties and responsibilities:

 

(1) Conduct or cause to be conducted continuing research and studies on building, housing, and environmental planning standards and requirements to safeguard life or limb, health, property, and public welfare;

 

(2) Prepare a draft of a uniform code of criteria, standards, and detailed specifications covering design, construction, and other related matters suited to local needs and indigenous conditions for adoption by local governments to supplement the minimum standards provided in this Code;

 

(3) Prepare drafts of environmental planning, management and control codes, subdivision policies and standards, zoning regulations and other codes for legislative enactment; and recommend, from time to time, changes in this Building Code for submission to Congress; and

 

(4) Transmit appropriate recommendation to the Secretary of Public Works and Communications as a basis for the promulgation by the Secretary of the necessary rules and regulations to carry out the provisions of this Code.

 

(c) Technical Staff. The Commission shall be assisted by a Technical Staff which shall be headed by an Executive Director and an Assistant Executive Director. All personnel shall be appointed by the Chairman subject to civil service laws, rules, and regulations.

 

(d) Appropriations. The amount of two hundred and fifty thousand pesos (P250,000) or such amount thereof as may be necessary for the operation of the Commission is hereby authorized to be appropriated out of any funds not otherwise appropriated for the fiscal year ending June 30, 1973. Such sums may be necessary for the operating expenses of the Commission in succeeding fiscal years shall be included in the annual General Appropriations Act.

 

SECTION 1.02.02: Secretary of Public Works and Communications and Building Officials

 

(a) The Secretary of Public Works and Communications, hereinafter referred to as the "Secretary", shall promulgate such rules and regulations necessary to enable the Building Official to enforce the provisions of this Code.

 

(b) In municipalities, the Municipal Engineer shall be the Building Official; Provided, That when there is no such Municipal Engineer, or a duly licensed engineer performing the duties of a Municipal Engineer, or a Land and Building Official, the Provincial Engineer, or in the absence thereof, the Public Works Engineer within whose jurisdiction the municipality falls shall be the Building Official. In case of cities, the City Public Works Supervisor shall be the Building Official: Provided, That when there is no such City Public Works Supervisor, the City Engineer shall be the Building Official. For the purpose of the enforcement of the provisions of this Code, the Building Official shall be under the supervision of the Secretary of Public Works and Communications, any provision of law to the contrary notwithstanding.

 

(c) Subject to the approval of the Municipal Mayor, City Mayor, or Provincial Governor in the proper case, and other civil service laws and rules, the Building Official may appoint such number of officers, inspectors, assistants, or other employees possessing the necessary qualifications and competency as may be authorized by the Municipal Council, City Council, or Provincial Board, as the case may be. He may deputize such technically qualified employees as may be necessary to carry out the provisions of this Code. For purposes of this Subsection, the terms "necessary qualifications and competency" and "technically qualified" shall mean that the person to be deputized shall have passed the highest grade of examination called for in the applicable law regulating the practice of the branch of engineering or architecture related to or associated with the duties and powers which the person to be deputized shall assume.

 

SECTION 1.02.03: Building permits

 

(a) Any person, firm, or corporation, including any department, office, bureau, agency of instrumentality of the government intending to construct, alter, repair, move, convert or demolish any building or structure, or cause the same to be done, shall obtain a building permit from the Building Official for whichever of such work is proposed to be undertaken for the building or structure, before any such work is started.

 

(b) Appropriate rules and regulations shall be set by the Secretary concerning:

 

(1) Forms for application for building permits;

(2) Procedures to be observed in securing such permits;

(3) Procedures to be observed in the issuance, suspension, and revocation of such building permits; and

(4) Type, nature, and scope of plans and specifications, and other requisite documents, which shall be prepared and designed by a licensed architect or engineer.

 

(c) When authorized by the Building Official in accordance with the provisions of this Code, plans and specifications need not be submitted for the following:

 

(1) Group A traditional indigenous type of dwelling construction costing not more than three thousand pesos (P3,000.00); and

 

(2) Group J Division 1 Occupancy of Type 1 conventional wood frame construction or of the traditional indigenous type of construction costing not more than three thousand pesos (P3,000.00).

 

(d) The applicant for a building permit for private buildings or structures after having complied with all the requirements prescribed therefor in accordance with the provisions of this Code, shall be issued a building permit within fifteen (15) days from the date of payment of the permit fee for Groups A and J Occupancies and within thirty (30) days from the date of payment of the permit fee for other Group Occupancies, unless the Building Official or his Deputy authorized to issue the permit shall inform the applicant in writing why the permit should not be issued, and shall indicate thereon the particular provisions of the Code violated by the applicant or the particular requirements not complied with. Within fifteen (15) days from the date of receipt by the applicant of advice from the Building Official or his Deputy authorized to issue the permit why the building permit should not be issued, or why the building permit is suspended or revoked, the applicant may appeal the non-issuance, suspension, or revocation thereof, to the Mayor of the chartered city or municipality, or the Governor of the province where the building or structure for which the permit is being applied for is located. Said appeal shall be decided within fifteen (15) days from receipt thereof, otherwise, the applicant may bring the matter to the proper Court of Justice for final disposition.

 

(e) All public buildings shall conform to the provisions of this Code and the Building Official of the city or province where the public building is located shall issue the building permit therefor, stating in writing that such public building conforms to the requirements of the Code. For national public buildings, the Secretary of Public Works and Communications shall issue a certification that such a building conforms to the Code. Public buildings shall be exempt from payment of building permit, inspection, another fees.

 

SECTION 1.02.04: Fees

 

(a) Regulations on building permit, inspection and other fees, and for compliance with the same shall be covered by city and municipal ordinances: Provided, That Traditional indigenous family dwellings under Section 1.01.04 (d) shall be exempt from payment of building permit fees.

 

SECTION 1.02.05: Inspection ad Certificates of Occupancy

 

(a) Inspection. The duly licensed architect or engineer engaged by the owner to undertake inspection and detailed supervision of the construction shall periodically certify that the construction conforms to the plans and specifications submitted in the application for a building permit. Upon submission of such periodic certifications during the progress of construction, the Building Official shall periodically issue the required authority to continue with the subsequent phases of construction, without prejudice to his right to conduct on his own initiative any inspection of the said construction. Upon completion of the construction, the said duly licensed architect or engineer shall submit to the Building Official the final certification that the building conforms to the provisions of the Code and with the detailed plans and specifications submitted.

 

(b) Certificates of Occupancy. The proper Certificate of Occupancy shall be issued to the applicant within seven (7) days from completion of the requirements for inspection and occupancy and payment of any and all fees therefor, unless the building Official or his Deputy issuing the Certificate shall show cause in writing why the Certificate should not be issued and shall indicate thereon the particular provisions of the Code violated or the particular requirements not complied with. Within fifteen (15) days from receipt by the applicant of the advice from Building Official or his Deputy authorized to issue the certificate why the certificate should not be issued, or why the certificate is suspended or revoked, the applicant may appeal the non-issuance, suspension, or revocation thereof, to the Mayor of the chartered city or municipality, or the Governor of the province where the building for which the certificate is being applied for is located. Said appeal shall be decided within fifteen (15) days from receipts thereof, otherwise, the applicant may bring the matter to the proper Court of Justice for final disposition. The building may be occupied only upon issuance of the Certificate of Occupancy. chan robles virtual law library

 

SECTION 1.02.06: Violations of This Code Covering Designs, Materials, Methods of Construction, and Workmanship

 

(a) In all cases of violation of this Code covering design, materials, methods of construction, and workmanship, the Building Official shall observe the following procedure in ordering the alteration to conform to this Code or demolition of the building or portion thereof:

 

(1) Where the building is in the process of construction, the construction of the portion or portions in violation of this Code shall be stopped until the same shall have been altered to conform to this Code, unless such partial violation will impair the stability and safety of the whole or part of the structure, in which case, the whole construction shall be stopped.

 

(2) Where a building or portion thereof has been constructed, the following procedure shall be observed:

(2.1) In case it can be reasonably altered to conform to the requirements of this Code, it shall be altered accordingly;

 

(2.2) In case the lateration will cost more than 50 per cent of the current construction cost of the building, it shall be altered to conform to this Code or demolished at the option of the owner;

 

(2.3) In case the building or portion thereof poses an immediate danger to life, limb, or property, the same shall be vacated immediately, then altered to conform to the requirements of this Code or demolished in accordance with subparagraphs (1) and (2) herein.

(3) If the owner, after receipts of the order of alteration or demolition fails to comply with such order within a period of one year, said construction shall be declared a nuisance and be abated in accordance with the provisions of Article 699 of the Civil Code of the Philippines.

 

(b) This Code shall not be construed to deprive any person the right to avail himself of any and all judicial proceedings or remedies available under existing laws.

 

(c) Nothing in this Chapter is intended to diminish the powers vested in the different Boards of Examiners of the various architectural and engineering professions as provided for in existence laws regulating the practice of architecture and engineering, nor to restrict the designing engineering or architect in the exercise of his professional discretion within the basic minimum standards and requirements embodied in Section 1.01.02 of this Code.

 

TITLE 2 - FIRE AND FIRE-RESISTIVE STANDARDS

Chapter 2.01 - REQUIREMENTS FOR FIRE ZONES

 

SECTION 2.01.01: General

 

(a) Fire Zones Defined. Fire zones are areas within which only certain types of building are permitted to be constructed based on their use, occupancy, type of construction, and resistance to fire.

 

(b) Building Located in More Than One Fire Zone. If a building or structure is located in more than one fire zone and more than one-third of its total floor area is in a more restricted fire zone, then the entire building shall conform to the requirements for the more restricted area.

 

(c) Moved Building. Any building or structure moved within or into any fire zone shall be made to comply with all the requirements for buildings of that fire zone.

 

(d) Temporary Buildings. Temporary buildings or structures conforming to the requirements of this Code, used for the protection of the public around and in conjunction with construction work may be erected in any of the fire zones:Provided, that such work is allowed by special permit from the Building Official and such is used only for a limited period of time.

 

(e) Center Lines of Streets. For the purpose of this Chapter, the center line of an adjoining street or alley may be considered an adjacent property line. Distance shall be measured at right angles to the street or alley.

 

SECTION 2.01.02. Designation of Fire Zones

 

(a) The Secretary shall classify each type of fire zone in accordance to use, occupancy, type of construction, and resistance to fire subject to the provisions of this Code.

 

(b) Based on the classification of fire zones, City Counsels or Municipal Boards, by resolution, shall divide cities and municipalities into fire zones. Such division shall be in accordance with the local physical and spatial framework plans or the recommendation of the local city or municipal development body.

 

Chapter 2.02 - FIRE-RESISTIVE REQUIREMENTS AND STANDARDS FOR FIRE PROTECTION

 

SECTION 2.02.01: Fire-Resistive Requirements

 

(a) Exterior bearing and nonbearing walls of Types II and III constructions shall have one-hour fire-resistive rating; while those of types IV and V shall have four-hour fire-resistive rating.

 

(b) Interior bearing walls, permanent partitions, floors, and roofs of Types II to IV constructions shall have one-hour fire-resistive rating; while those of Type V shall have three-hour fire-resistive rating for walls, one-hour fire-resistive rating for partitions, and two-hour fire-resistive rating for vertical openings, floors, and roofs.

 

(c) Structural frames of Types II and III constructions shall have one-hour fire-resistive rating; those of Type IV shall have two-hour fire-resistive rating; and those of Type V shall have three-hour fire-resistive rating.

 

(d) Exterior doors and windows shall have three-fourths-hour fire-resistive rating for all types of construction.

 

SECTION 2.02.02: Fire-Resistive Standards

 

(a) General. Materials and systems of fire-resistive purposes shall be classified according to their fire-resistive ratings as determined by internationally accepted testing methods, subject to the provisions of this Section.

 

(b) One-Hour Fire-Resistive Time Period Rating

 

(1) The following walls and partitions shall have a one-hour fire-resistive rating: Solid masonry, 10 centimeters (4 inches) thick; hollow unit masonry, 15 centimeters (6 inches) thick; solid concrete, 10 centimeters (4 inches) thick; stud walls covered on each side with 1.9 centimeters (3/4 inch) lath and plaster, 1.6 centimeters (5/8 inch) of vermiculite gypsum board, or 2.5 centimeters (1 inch) of gypsum board; and 5 centimeters (2 inches) nominal thickness tongue and groove wood, or two layers of 1.9 centimeters (3/4 inch) tongue and groove wood separated by sheet metal or asbestos paper and treated on each side with a fire-retardant coating having a flame-spread rating of 50 or less. Square-edged boards may be used is the layers are laid at right angles with each other.

 

(2) The following floors shall have a one-hour fire-resistive rating: masonry or concrete, 10 centimeters (4 inches) thick; wood joists having two layers of flooring above and a plaster or gypsum board ceiling, 1.9 centimeters (3/4 inch) in thickness - the two layers of flooring shall be separated by sheet metal or asbestos building paper; 6.3 centimeters (2-1/2 inches) net thickness tongue and grooved wood floors covered with 1.9 centimeters (3/4 inch) wood flooring laid at right angles thereto. The supporting beams for such floors shall be not less than 15 centimeters (6 inches) in minimum dimension.

 

(3) The following protections for metal structural members shall have one-hour fire-resistive rating: 2.5 centimeters (1 inch) of concrete; 3.8 centimeters (1-1/2 inches) of masonry; and metal lath and 2.5 centimeters (1 inch) of plaster.

 

(4) The following shall also have a one-hour fire-resistive rating; wood colums, 20 centimeters (8 inches) or more in least dimension; and wood beams, 15 centimeters (6 inches) or more in least dimension.

 

(c) Two-Hour Fire-Resistive Time Period Rating

 

(1) The following partitions, walls, and floors shall have a two-hour fire-resistive rating: solid masonry, 15 centimeters (6 inches) thick; hollow unit masonry, 20 centimeters (8 inches) thick; and solid concrete, 127 centimeters (5 inches) thick.

 

(2) The following protections for metal structural members shall have a two-hour fire-resistive rating. 3.8 centimeters (1-1/2 inches) of concrete; 5 centimeters (2 inches) of masonry; and two layers of metal lath and plaster with 1.9 centimeters (3/4 inch) air space between and having a total thickness of 6.3 centimeters (2-1/2 inches).

 

(d) Three-Hour Fire-Resistive Time Period Rating

 

(1) The following partitions, walls, and floors shall have a three-hour fire-resistive rating: solid masonry, 17.8 centimeters (7 inches) thick; hollow unit masonry, 25.4 centimeters (10 inches) thick; and solid concrete, 15 centimeters (6 inches) thick.

 

 

(2) The following protection for metal structural members shall have a three-hour fire res

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