ARTICLE 3


One- and Two-Family Dwellings - Space and Fire Safety

PART

710 General Requirements
711 Space

712 Light and Ventilation

713 Stairs, Doors and Exits

714 Openings for Emergency Use

715 Safety Glazing

716 Prevention of Exterior Fire Spread

717 Prevention of Interior Fire Spread

718 Interior Finishes,Trim and Decorative Materials

719 Plastic Materials

720 Swimming Pool Enclosures

PART 710

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GENERAL REQUIREMENTS

710.1 General requirements. Buildings occupied or used as a one- and two-family dwelling or a community residence, in whole or in part for purposes within the scope of this section, shall be designed and constructed so as to comply with the requirements hereinafter set forth in order to provide safe and healthful environment, and to retard the exterior and interior spread of fire.

PART 711

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SPACE

711.1 Habitable space

711.1a Size

711.1a-1 A dwelling unit shall contain at least one habitable space which shall have a minimum floor area of 150 square feet with a minimum horizontal dimension of 10 feet. Other habitable spaces, except kitchens shall have a minimum floor area of 80 square feet with a minimum horizontal dimension of 7 feet.

711.1a-2 Habitable space shall have a minimum height of 7 feet 6 inches, except that for habitable space under a sloping roof the minimum height in at least 50 per cent of the floor area shall be 7 feet 6 inches and the area where the height is less than 5 feet shall not be considered in computing required floor area.

711.1a-3 Where exposed beams project below the ceiling of habitable space, and such beams occupy an area of 5 percent or more of the area of the ceiling, the height of the space shall be measured from finished floor to the underside of beams. Where the ratio is less than 5 percent, the height to the underside of beam shall be not less than 7 feet.

711.1b Location in respect to grade level. Floor level of habitable space shall not be more than 4 feet below the average adjoining finished grade. No habitable space shall be located in cellars, except that below-grade space is permitted as habitable space where in conformity with the following conditions:

(1) The grade adjoining one exterior wall for the entire width of the habitable space is at or lower than the floor level of the habitable space.

(2) The depth is not more than four times the height.

(3) Such space conforms to all other requirements for habitable space.

711.2 Nonhabitable Space

711.2a Nonhabitable space shall be provided with light and ventilation adequate for the intended use of each space. Bathrooms and toilet rooms shall have provisions for privacy.

711.2b Bathrooms, toilet rooms, kitchenettes, corridors and recreation rooms shall have a minimum height of 7 feet.

PART 712

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LIGHT AND VENTILATION

712.1 Habitable space

712.1a Light

712.1a-1 Habitable space except kitchens, shall be provided with natural light through one or more windows, skylights, transparent or translucent panels, or any combination thereof, that face directly on legal open spaces at least 5 feet wide above the adjoining finished grade, or above a roof. The amount of light shall be equivalent to that transmitted through clear glass equal in area to not less than 8 percent of the floor area of the habitable space.

712.1a-2 Kitchens shall be provided with artificial lighting equipment and may also be provided with natural light.

712.1b Ventilation. Habitable space shall be provided with ventilation in accordance with either of the following:

712.1b-1 Natural ventilation through openable parts of windows or other openings in exterior walls that face legal open spaces at least 5 feet wide above the adjoining finished grade or above a roof, or through openable parts of skylights, providing total clear ventilation area equal to not less than 4 percent of the total floor area of each habitable space; or

712.1b-2 Mechanical ventilation providing outdoor air, or a mixture of outdoor and recirculated air, in accordance with the quantities set forth in the applicable requirements of the State Energy Conservation Construction Code.

712.2 Nonhabitable space

712.2a Light Kitchenettes, bathrooms and toilet rooms shall be provided with light of sufficient intensity and so distributed as to permit the maintenance of sanitary conditions and the safe use of the space and the appliances, equipment and fixtures.

712.2b Ventilation Kitchenettes, bathrooms and toilet rooms shall be provided with ventilation in accordance with either of the following:

(1) Natural ventilation as set forth in 712.1b, except that such openable areas shall be not less than 1-1/2 square feet for bathrooms or toilet rooms and not less than 3 square feet for kitchenettes; or

(2) Mechanical exhaust ventilation in accordance with the quantities set forth in the applicable requirements of the State Energy Conservation Construction Code.

PART 713

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STAIRS, DOORS AND EXITS

713.1 Stairs

713.1a General requirements. Stairs, both interior and exterior, shall be arranged and constructed to provide safe ascent and descent. A fixed stair shall be provided where travel is required between two stories, each of which contains a habitable space or a recreation room, and between the first story and basement or cellar. Disappearing or folding stairs may be used between an above-grade story and an attic without a habitable space or recreation room.

713.1b Treads

713.1b-1 Minimum widths of treads shall be 9 inches, plus 1-1/8 inch nosing for closed riser type, or 9 inches for open riser type, except that treads of folding or disappearing stairs intended for occasional use only shall have a minimum width of 6 inches.

713.1b-2 Winder treads at converging ends of winders, exclusive of minimum 1-inch nosings, shall be not less than 4 inches wide unless the winders are guarded at the converging ends by continuous handrails which prevent walking where the tread widths are less than 6 inches. If the winder treads are without a minimum 1-inch nosing, the tread widths in these locations shall not be less than 5 inches and 7 inches, respectively.

713.1b-3 Winder tread widths at a distance of 18 inches from the converging ends shall be not less than the tread widths as set forth in 713.1b-1.

713.1b-4 Treads shall be level and all other than winder treads shall be uniform in width, with no variation exceeding 1/8 inch in any one run of stairs.

713.1c Risers

713.1c-1 Maximum heights of risers shall be 8-1/4 inches except that the maximum height of risers of folding or disappearing stairs, exterior stairs to basements or cellars, and of other stairs intended for occasional use only, shall be 9 inches.

713.1c-2 There shall be no variation exceeding 1/8 inch in the height of risers in any one run of stairs.

713.1d Width. Widths of stairs shall be not less than 2 feet 8 inches clear between handrails or between handrails and opposite wall surface; except that stairs to a cellar or attic shall not be less than 2 feet 6 inches clear between handrails or between handrail and opposite wall surface.

713.1e Headroom. The minimum clear headroom over any portion of any fixed stair tread shall be not less than 6 feet 6 inches measured vertically from the surface of the tread, except that the minimum shall be not less than 6 feet 4 inches over stairs from a second story to a third story and over stairs to a basement or cellar.

713.1f Handrails and railings

713.1f-1 Stairs or steps of more than three risers shall have a handrail or railing parallel to the stair slope on at least one side. Where one or both sides of such stairs or steps are open, railings shall be provided on open sides.

713.1f-2 Window openings on stairs or landings, and well openings, shall be guarded by railings or other equivalent protection.

713.1f-3 Landings, platforms and porches more than 18 inches above the adjacent floor or grade level shall be provided with railings on the open sides, except where openings are required for access.

713.1f-4 Top surfaces of handrails and railings shall be not less than 30 inches nor more than 36 inches in height above the floor or tread level. On stair runs, the height shall be measured directly above the riser face.

713.1f-5 Clearance between handrail and supporting wall shall be not less than 1-1/2 inches.

713.1g Landings. The swing of a door opening on a stairway shall not overlay the top step. Where landings are provided, their width shall be not less than the width of the stair of which they are a part.

713.1h Light. Treads of stairs shall be lighted by either natural or artificial light of sufficient intensity to allow safe ascent and descent.

713.2 Doors

713.2a Width. Main entrance door shall be at least 36 inches in width.

713.2b Doors intended for passage shall be not less than 6 feet 8 inches in height.

713.3 Exits

713.3a Exit stairways may serve in common two dwelling units as set forth in 717.3d of this code.

713.3b Exits for one-family dwellings more than 3 stories in height. One-family dwellings exceeding three stories in height shall have exits from every story which provide safe continuous passage to a legal open space, and shall have at least one interior stairway enclosed in construction having a fire-resistance rating of at least 3/4 hour. All openings in such enclosures shall be provided with a self-closing opening protective as set forth in 717.3g of this code.

713.3c Widths of interior exit stairs. Interior exit stairs in dwellings more than two stories in height shall be at least 3 feet wide, and in all other respects shall comply with Part 717.3d of this code.

713.3d Exits for dwellings units in buildings with mixed occupancy and for two-family dwellings. Exits for dwelling units in buildings containing mixed occupancy and for two-family dwellings shall conform with the provisions set forth in 717.3D of this code.

PART 714

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OPENINGS FOR EMERGENCY USE

714.1 General requirements.

714.1a In addition to the primary exit from a recreation room, or a habitable space except kitchens, there shall be provided in each such space at least one openings for emergency use.

714.1b Openings for emergency use shall include doors or openable parts of windows, located so as to provide unobstructed egress to legal open spaces.

714.1c Such openings shall not impede egress in an emergency, shall have a minimum area of 4 square feet, with a minimum dimension of 18 inches, with bottom of openings no higher than 3 feet 6 inches above finished floors in all above-grade stories, and no higher than 4 feet 6 inches where required in basement or cellar.

PART 715

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SAFETY GLAZING

715.1 Glazing in doors, shower stalls, fixed panels and bathtub enclosures.

715.1a Glazing in doors, shower doors and enclosures, and bathtub doors and enclosures, shall be so sized, constructed, treated or combined with other materials as to minimize effectively the possibility of injury to persons in the event the glazing is cracked or broken.

715.1b Glazing in doors, fixed side panels adjoining doors, and in interior partitions where glazing extends to within 18 inches or less of floor level, shall conform to the requirements of 715.1a or in lieu thereof in fixed panels, permanent construction shall be provided to guard against accidental human impact.

715.1c Shatter-resistant material may be substituted for glass intended to be used as described in this section. Where used in exits such material shall conform to the requirements of Part 718.

715.2 Identification. Where generally accepted standards require glazing to be identified, each piece shall be permanently and legibly marked in conformity:with the requirements of the generally accepted standards.

PART 716

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PREVENTION OF EXTERIOR FIRE SPREAD

716.1 General requirements. In order to retard the spread of fire, dwellings and accessory structures shall be located and constructed so that the distance between buildings and the fire resistance of exterior walls and of roof coverings are commensurate with the fire hazard involved.

716.2 Distance separations

716.2a How measured. Distance separation shall be the clear distance measured between the exterior walls of two buildings on the same premises, or from an exterior wall of a building to an interior lot line.

716.2b When required

716.2b-1 Distance separations set forth in Table I-716 shall be required except as provided in 716.2b-2 and 716.2b-5.

716.2b-2 Distance separations shall not be required between buildings on the same premises when either building is one story in height and has an area of not more than 100 square feet.

716.2b-3 Exterior walls or portions thereof may encroach upon the distance separation required by a type of construction, provided those portions of such walls which encroach are built of the higher type of construction imposed by the lesser distance separation.

716.2b-4 Where the heights or construction of the exterior walls of the proposed and existing buildings are not the same, the applicable distance separation shall be that set forth for the building having exterior walls with the lower fire-resistance rating, whichever is the greater distance.

716.2b-5 An open breezeway with at least 5 feet between the dwelling and garage shall be acceptable as distance separation as set forth in 717.3f.

716.2b-6 Where zoning regulations and this Code contain distance requirements applicable to the same structure, the greater distance shall control.

                              TABLE I-716

                       MINIMUM DISTANCE SEPARATIONS
                                 in feet
                            (np = not permitted)

                                        Combustible 
                                        walls with            Combustible
                    Noncombustible      noncombustible        walls with
                    walls with          exterior              combustible
                    fire-resistance     facings giving        exterior 
Fire     Height     ratings of -        protection of -       facings
Limits    in
        stories   At least  Less than   At least Less than   
                   3/4 hr     3/4 hr     3/4 hr    3/4 hr  


Within    1          0         5(1)        np        np         np
fire      2          0         8           np        np         np
limits    3          0         np          np        np         np
  A       4+         0         np          np        np         np


Within    1          0         3(1)        3(1)      np         np
fire      2          0         4           4         np         np
limits    3          0         5           np        np         np
  B       4+         0         np          np        np         np

Outside   1          0         2(1)        0         3(1)       4(1)
the       2          0         3           0         4          5
fire      3          0         4           0         5          6
limits    4+         0         np          np        np         np
(1) The minimum distance separation between adjacent one-story private garages of this type of construction not exceeding 750 square feet in area may be 1-1/2 feet.
716.3 Construction limitations within fire limits.

716.3a Buildings within fire limits A may be of any type of construction other than type 5 providing they conform to the fire-area limitations set forth in Section 705.2 including Table I-705.

716.3b Buildings within fire limits B may be of any type of construction other than that having combustible walls with a fire-resistance rating of less than 3/4 hour providing they conform to the fire-area limitations set forth in Section 705.2 including Table I-705.

716.3c Open porches, verandas, and balconies, or enclosed porches with at least 60 percent of glazed area on three sides, may be constructed of combustible materials provided they do not extend outward more than 10 feet from the building, or upward more than 4 feet above the ceiling of the second story, and are not less than 3 feet distant at any point from a lot line or from similar appurtenances on another building; if they exceed said limitations, they shall be constructed of noncombustible materials.

716.4 Construction limitations outside the fire limits.

716.4a Buildings may be of any type of construction providing they conform to the fire limitations set forth in Section 705.2 including Table I-705.

716.4b Porches, verandas, and balconies of combustible construction shall be not less than 3 feet distant at any point from a lot line or from similar appurtenances on another building.

716.5 Protection of openings in exterior walls.

716.5a General requirements. Exterior wall openings located less than 2 feet from an interior lot line shall be equipped with opening protectives.

716.5b Fire resistance of exterior wall opening protectives. Fire-resistance ratings of required exterior wall opening protectives shall be at least 3/4 hour.

716.6 Eaves, cornices and trim

716.6a Eaves and main exterior cornices may project beyond the building face not more than one third of the required distance separation, but this regulation shall not be deemed to authorize any projection beyond the lot line.

716.6b Building trim may project beyond the building face not more than one sixth of the required distance separation, but this regulation shall not be deemed to authorize any projection beyond the lot line.

716.6c Eaves, cornices and exterior trim shall be of noncombustible materials when the distance between such eaves, cornices or trim of adjoining buildings is less than 3 feet.

716.7 Roof coverings. Roof coverings shall be capable of resisting fire commensurate with the severity of exposure and shall be installed in conformity with generally accepted standards.

716.7a Classification. Roof coverings shall be classified on the basis of their resistance to exterior fire exposure as determined by tests made in conformity with generally accepted standards, as follows:

716.7a-1 Class A, B or C roof coverings are those which are capable of resisting severe, moderate or light fire exposure, respectively, and which do not give off flying brands.

716.7a-2 Nonclassified roof coverings are those which are moderately effective in resisting light fire exposure, afford a slight degree of heat insulation to the roof deck, and are likely to give off flying brands.

716.7b Limitations of use.

716.7b-1 Within the fire limits, roof coverings shall be Class A, B or C; except that where the distance separation between buildings is more than 10 feet and the horizontal projected area of the roof does not exceed 500 square feet, nonclassified roof coverings may be used.

716.7b-2 Outside the fire limits, roof coverings shall be Class A, B or C; except that where the distance separation between buildings is more than 10 feet, nonclassified roof covering or wood shingles may be used.

716.7c Skylights.

716.7c-1 Skylights and roof panels shall conform to the requirements for roof coverings as set forth in section 716.7 except as provided in 716.7c.

716.7c-2 Skylights and roof panels in roofs are permitted to be glazed with plastic as set forth in Part 719, provided each skylight or panel does not exceed 200 square feet in area and that the distance between them is at least 5 feet.

716.7c-3 Skylights and roof panels shall be mounted above the plane of the roof.

716.8 Parapet walls. Parapet walls at least 6 inches in height shall be provided on fire and party walls required to extend through the roof.

716.9 Party walls.

716.9a Where buildings are joined at a common lot line, such buildings shall be separated by party walls in conformity with the requirements set forth in this section.

716.9b Openings shall not be permitted in party walls.

716.9c Construction

716.9c-1 Party walls shall form a continuous fire and smoke barrier between adjoining buildings from foundation to or through the roof and shall be capable of serving as exterior walls. Removal or collapse of construction on one side shall not endanger the support of construction of the opposite side.

716.9c-2 Party walls shall be constructed on noncombustible materials and shall extend not less than 6 inches above roofs of combustible construction. When a roof is of noncombustible construction for a distance of at least 18 inches on each side of the wall, a party wall may terminate at the underside of the roof providing the junction of the wall and roof is made smoketight.

716.9c-3 Party walls shall be made smoketight at their junction with exterior walls, and the exterior wall shall be protected with noncombustible construction for a distance of at least 18 inches on each side of the party wall. In lieu of such protection at the end of party walls in type 5 construction, the party wall shall project through the exterior wall at least 6 inches.

716.9c-4 Where combustible members, such as joists and beams, are framed into party walls, such combustible members shall not extend through the wall but shall have at least 4 inches of solid noncombustible material below and at the sides and ends of such members.

716.9d Fire resistance

716.9d-1 The fire-resistance rating of party walls between one-story one-and two-family dwellings without a basement shall be at least 1 hour.

716.9d-2 The fire-resistance rating of party walls between one- and two-family dwellings shall be at least 2 hours, except as set forth in 716.9d-1.

716.9d-3 The fire-resistance ratings of party walls between one- and two-family dwellings and buildings containing nonresidential occupancies of low, moderate or high hazard classification shall be at least 2, 3 or 4 hours respectively.

PART 717

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PREVENTION OF INTERIOR FIRE SPREAD

717.1 General requirements. Buildings shall be constructed, arranged and separated into fire areas so as to confine and restrict the spread of fire.

717.2 Fire walls. The floor area of buildings shall be divided by fire walls into fire areas in accordance with Part 705 of this code including Table I-705.

717.2a Construction

717.2a-1 Fire walls shall form a continuous fire and smoke barrier between fire areas from foundation to or through the roof, and the removal or collapse of construction on one side shall not endanger the support of construction on the opposite side.

717.2a-2 Fire walls shall be constructed on noncombustible materials and shall extend not less than 6 inches above roofs of combustible construction. Where a roof is of noncombustible construction for a distance of at least 18 inches on each side of the wall, a fire wall may terminate at the underside of the roof providing the junction of the wall and roof is made smoketight.

717.2a-3 Fire walls shall be made smoketight at their junction with exterior walls in type 5 construction, the exterior walls shall be protected with noncombustible construction of the same fire-resistance rating as the fire walls for a distance of at least 18 inches on each side of the fire wall, or the fire wall shall project through the exterior at least 6 inches.

717.2a-4 Where combustible members, such as joists and beams, are framed into fire walls, such combustible members shall not extend through the wall but shall have at least 4 inches of solid noncombustible material below and at the sides and ends of such members.

717.2b Fire resistance.

717.2b-1 The fire-resistance rating of fire walls in one-story one-and-two-family dwellings without a basement shall be at least 1 hour.

717.2b-2 The fire-resistance rating of fire walls in one- and two-family dwellings more than one story in height shall be at least 2 hours, except that in buildings more than 2 stories in height the fire-resistance rating for that portion of the wall extending through a basement, cellar or the lowest story of such buildings which do not have a basement or cellar shall be at least 3 hours.

717.3 Division by fire separations

717.3a Separation between dwelling units. Separation between dwelling units shall have a fire- resistance rating of at least 3/4 hour.

717.3b Separation of occupancies. Nonresidential occupancies in or attached to a one- or two- family dwelling shall be separated from the dwelling occupancy by fire separations having fire- resistance ratings in conformity with the requirements of Table I-717.

                        TABLE I-717

    MINIMUM FIRE SEPARATION REQUIRED BETWEEN OCCUPANCIES
             (Fire-resistance ratings in hours)


    Occupancy                  One- and Two-family Dwellings


    Business    C1 .........................  1

    Mercantile  C2 .........................  1

    Industrial  C3.1 .......................  2

                C3.2 ....................... np

                C3.3 ....................... np

    Storage     C4.1 .......................  2(2)

                C4.2 ....................... np(3)

                C4.3 ....................... np

    Assembly    C5.1 ........................ 2

                C5.2 ........................ 3

                C5.3 ........................ 4

                C5.4 ........................ 2

                C5.5 ........................ 2

    Institu-    C6.1 ........................ 2(1)
     tional
                C6.2 ........................ 2(1)

                C6.3 ........................ 2

(1)  1-hour for day-care center in a building of 
       Type 4b or Type 5 construction.
(2)  For garages, see 717.3f.
(3)  2-hour for self-service storage facilities.
717.3c Construction.

717.3c-1 Fire separations and their supporting construction shall form a continuous fire and smoke barrier.

717.3c-2 Fire separations between dwelling units and occupancies not accessory thereto, other than residential, shall be continuous, and any openings therein shall be protected with self-closing opening protectives.

717.3d Enclosures of exits and stairways. Exits, including stairways and passageways forming a part thereof, serving in common two dwelling units or passing through or adjoining another dwelling or any occupancy other than residential, shall be separated therefrom by a fire separation having a fire resistance rating of at least 3/4 hour.

717.3e Enclosure of heat producing equipment.

717.3e-1 Heat producing equipment shall be mounted on noncombustible floor construction, or on protected combustible floor construction, shall be installed with sufficient clearance from adjacent wood and other combustible material to prevent their ignition, and when the ceiling above can be heated to temperatures in excess of 175 degrees F., it shall be protected for a distance of 3 feet on all sides of the heat producing equipment by noncombustible material providing 10 minutes more of fire protection, except when such ceiling is constructed of noncombustible material and has a fire- resistance rating of at least 3/4 hour.

717.3e-2 Where fuel-burning heat producing equipment is located at a level containing habitable space, the walls, floor and ceiling 3 feet or less from such equipment shall have a fire-resistance rating of at least 3/4 hour and an interior finish providing at least 10 minutes of fire protection to the combustible members. Such protection shall not be required where tests made in conformity with generally accepted standard show that such heat producing equipment will not create a fire hazard or heat adjacent combustible material above 175 degrees F. Where doors are provided for enclosed heater rooms they shall be self-closing and finished or covered on the inside with noncombustible material.

717.3e-3 Fuel burning heat producing equipment within a garage shall be protected from physical damage by vehicles.

717.3e-4 Floor-mounted fuel burning heat producing equipment within a garage located below grade or within a below-grade space opening directly into a garage, shall be installed on a noncombustible platform not less than 18 inches above the floor.

717.3f Separations of garages in, or attached to, one- and two-family dwellings.

717.3f-1 Private garages in, or attached to, a dwelling shall be separated from other spaces in the building by construction having a fire-resistance rating of at least 3/4 hour. Each opening in the separation between the garage and other space in the building shall be equipped with a self-closing door having a fire resistance rating of at least 3/4 hour. Such door shall not open directly into a room used for sleeping purposes.

717.3f-2 Floors in garages shall be of noncombustible material that will not absorb flammable liquids and shall be placed or arranged so that heavier-than-air flammable vapors cannot spread to fixed sources of ignition.

717.3f-3 Construction of garages and arrangement of equipment installations shall be such that toxic gases originating within garages shall not spread to the dwellings, nor shall air for heating or ventilation be circulated through garages to dwellings.

717.3f-4 For purposes of this Code, a carport with no more than two enclosing walls shall not be deemed to be a garage.

717.3f-5 An open breezeway with at least 5 feet between the dwelling and garage shall be acceptable as separation between a garage and a one- or two-family dwelling providing a firestop is provided between the roof and ceiling at the garage end of the breezeway.

717.3f-6 Where a breezeway is less than 5 feet between the dwelling and garage, or is closed on the sides, the garage shall be fire protected as though in or attached to the dwelling.

717.3g Openings in fire walls and fire separations. Openings in fire walls and fire separations shall be protected by opening protectives having fire resistance ratings as set forth in

TABLE II-717
OPENING PROTECTIVES FOR INTERIOR WALL OPENINGS 
Fire-Resistance Rating of Wall        Fire-Resistance Rating of
or Separation in Which Opening        Opening Protective,
Occurs, in Hours	in Hours
2 or more ........................... 1-1/2 
1 or 3/4 ............................ 3/4 
717.4 Firestopping.

717.4a General requirements.. Concealed spaces within wall, partition, floors, stair, attic, or cornice construction, and around chimney, pipe and duct openings in such construction, shall be firestopped to prevent the passage of flame, smoke, fumes and hot gases.

717.4b Materials

717.4b-1 Firestopping or fill shall be of nonflammable material which can be shaped, fitted and permanently secured in position.

717.4b-2 Noncombustible fire stopping materials shall be used in buildings of type 1 and 2 construction, and also around fireplaces, flues and chimneys in buildings of all types of construction.

717.4b-3 Combustible firestopping materials may be used in buildings of type 3, 4 and 5 construction.

717.4b-4 Flammable materials shall not be permitted as insulation or fill in concealed or attic spaces.

717.4c Location

717.4c-1 Concealed vertical spaces in walls and partitions shall be firestopped at each floor level and at the ceiling of the uppermost story so that such spaces will not be continuous for more than one story, or communicate with concealed horizontal spaces in the floor or roof construction.

717.4c-2 When combustible materials form a part of the concealed space between surface finish and the base to which they are applied, the concealed space shall be filled with noncombustible material, or be firestopped so that no dimension of such concealed space exceeds 8 feet vertically or 20 feet horizontally.

717.4c-3 Space between floor joists with ceilings attached directly to the joists shall be firestopped for the full depth of the joists at all points of support, under supported walls and partitions having a required fire- resistance rating and under all partitions separating dwelling units.

717.4c-4 Concealed space in stairs shall be firestopped so as not to communicate at the top and bottom of the stairs with concealed space in the floor construction.

717.4c-5 Exterior cornices and eaves shall be firestopped at the ends of fire and party wall, and at intervals of not more than 20 feet.

717.4c-6 In buildings of type 3, 4 and 5 construction, the space in attics or between combustible floor or roof construction and a suspended ceiling shall be firestopped so that no area of such concealed space shall be greater than 3,000 square feet.

717.5 Single station smoke detecting alarm device. At least one single station smoke detecting alarm device, installed in conformity with Section 1060.10 shall be provided adjacent to sleeping spaces on each floor level and shall be located on or near the ceiling.

717.6 Interior protection for wood foundation.

717.6a The interior surface of the wood foundation in a cellar or basement shall be covered with a noncombustible thermal barrier which shall provide fire protection for the foundation for at least 15 minutes. A vapor barrier shall be provided between the thermal barrier and the wood foundation.

717.6b At least one single station smoke-detecting alarm device shall be installed in the cellar or basement and shall comply with the requirements set forth in section 1060.10.

717.7 Safety controls for attic fans. Attic fans shall be provided with means for automatic shutoff in the event of fire.

PART 718

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INTERIOR FINISHES, TRIM AND DECORATIVE MATERIALS

718.1 General requirements.

718.1a Interior finish materials for acoustical correction, surface insulation and decorative treatment on the surfaces of walls and ceilings, and interior trim materials, shall conform with all requirements set forth in this section.

718.1b Interior finish and trim shall be of materials that will not, in burning, give off excessive smoke or objectionable gases.

718.2 Classification of interior finish materials. Interior wall and ceiling finish materials shall be classified in accordance with their surface flame-spread ratings determined by tests conducted in conformity with generally accepted standards, and as follows:

TABLE I-718
CLASSIFICATION OF INTERIOR FINISH MATERIALS 
Class Surface   flame-
                spread rating
A               0 to 25
B               26 to 75
C               76 to 200
D               201 to 500
718.3 Use of interior finishes.

718.3a Interior wall and ceiling finish materials in required enclosed exits shall be Class A or B.

718.3b Interior wall and ceiling finish materials in any location other than in an enclosed exit shall be Class A, B or C.

PART 719

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PLASTIC MATERIALS

719.1 General requirements.

719.1a Plastic materials shall be classified in accordance with their burning characteristics as determined by tests conducted in conformity with generally accepted standards.

719.1b Plastic materials shall be identified by permanent legible markings on each piece in conformity with generally accepted standards.

719.1c The requirements of this section are limited to construction regulated by this Code and shall not regulate plastic materials as permitted in Articles 9, 10 and 11 of this Code.

719.1d Plastic materials which give off smoke or gas denser or more toxic than given off by untreated wood or paper under comparable exposure to heat or flame, or which burn faster than 2- 1/2 inches per minute as determined by tests conducted in conformity with generally accepted standards, shall not be permitted.

719.1e Plastic materials may be used as a roof over an unenclosed structure located at grade level, provided such roof does not exceed 10 feet in height-and 1,000 square feet in area.

719.1f Plastics for light transmission from artificial lighting equipment are not required to conform to the flame-spread ratings for interior finish.

719.1g One-story accessory structures located at grade level not exceeding 500 square feet in area and 10 feet in height, located outside of fire limits, may be constructed of plastic materials provided the distance separation is at least 10 feet.

719.2 Foam plastic

719.2a Foam plastic insulation, except as set forth in 719.2b and 719.2c, shall have a surface flame spread rating no greater than 75 and a smoke density rating not greater than 450 and shall be permitted as follows:

719.2a-1 Within the cavity of a concrete or masonry wall

719.2a-2 On the interior surface of concrete or masonry walls provided the foam plastic insulation is provided by a thermal barrier.

719.2a-3 Within combustible wall, roof, floor or ceiling assemblies that are not required to have a fire resistance rating, provided the foam plastic insulation is protected on the interior side by a thermal barrier.

719.2a-4 As nonstructural sheathing for combustible exterior walls, provided the wall cavity is insulated with noncombustible material covered by a thermal barrier on the interior side.

719.2b Foam plastic shall be permitted as a component of an approved built-up roof.

719.2c Foam plastic shall be permitted as an integral component within a wall, roof, floor or ceiling assembly approved for the intended use.

PART 720

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SWIMMING POOL ENCLOSURES

720.1 General requirements. Outdoor swimming pools shall be provided with an enclosure which shall comply with the following:

720.1a shall be at least four feet in height and have a maximum vertical clearance to grade of two inches;

720.1b where a picket-type fence is provided, horizontal openings between pickets shall not exceed 4 inches;

720.1c where a chain-link fence is provided, the openings between links shall not exceed 2-3/8 inches;

720.1d enclosure shall be constructed so as not to provide footholds;

720.1e pickets and chain-link twists shall extend above the upper horizontal bar; and

720.1f such enclosure shall have railings and posts within the enclosure, which shall be capable of resisting a minimum lateral load of 150 pounds applied midway between posts and at top of posts respectively. Enclosure, fence material or fabric shall be capable of withstanding a concentrated lateral load of 50 pounds applied anywhere between supports on an area 12 inches square, without failure or permanent deformation. Gates provided in the enclosure shall be self-closing and self-latching with the latch handle located within the enclosure and at least 40 inches above grade.

720.1g a wall of a dwelling is permitted to serve as part of the enclosure under the following conditions:

720.1g-1 windows in the wall shall have a latching device at least 40 inches above the floor;

720.1g-2 a swinging door in the wall shall be self-closing and self-latching; and

720.1g-3 a sliding door in the wall shall have a self-latching device.

720.1h Where an above-ground pool has a deck which abuts or is adjacent to a dwelling and direct access to the deck or through the exterior wall of the dwelling, such access shall be in accordance with subdivision (g) of this section. For guardrail requirements, see section 713.1f3 of this Title and Table I-735, Part 735 of this Title.

720.2 Exemptions

720.2a Above-ground pools, with at least 46 inches between pool decking or pool top and adjoining grade, are exempt from the requirements of section 720.1 of this Part provided that their access ladder or steps can be blocked in an approved manner when not intended for use.

720.2b A pool less than 24 inches deep is exempt from the requirements of section 720.1 of this Part.