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<br />Amend Sectzon 2~0, by ~nscrt~~g new ~efi~~t~ons to re ~'<~"~_~ ._\'
<br />Noncombustible as applied to a ibUlldmg con 111I ~':'~ .
<br />means a material which, in the form fn which it is us ; I ~
<br />of the following groups (a) through '(c). It does not appl) 0 sur-
<br />~ace finish mat~rials nor to the deter!illination of whether a ~ateria~~,,~ .
<br />IS noncombustible from the standpOlp.t of clearances to heatmg apiA.: !tif=-
<br />pliances, flues or other sources .of high. te~perat.ure. ~o materi .... , ...ft
<br />shall be classed as noncombustible which IS subject to mcrease 1"", ~
<br />combustibility or flame spread ratingibeyond the limits herein esta f~'" .. '
<br />lishe~,. through the effects <;>f age, Ipoisture. or other atm<;>sphe r " -/ I
<br />condition. Flame spread ratmg as u$ed herem refers to ratmgs 0 ','
<br />tained according to the Standard Test Method for Fire :ij.a '7;i I
<br />Classification of Building Materials pf Underwriters' Labor ,. ,''. .
<br />Inc., ASTM E84. For data on sqch ratings see Und r '''"'
<br />Laboratories Fire Protection Equip.ment List under t
<br />Building Materials-Hazard Classififation (Fire) (40
<br />(a). Materials no part of whicih will ignite an
<br />subjected to fire. I ' ':
<br />(b). Materials having a strucfural base of rr "
<br />material, as defined in (a), with a sQrfacing not over
<br />which has a flame spread rating notjhigher than 50.
<br />(c). Materials, other than as d~scribed in (a) or (b), having
<br />a surface flame spread rating not higher than 25 without evidence
<br />of. continued progressive combustion' and of such composition that
<br />cross-sections in any plane would ~ot have a flame spread ratiri'?
<br />h.igher than 25 without evidence of ~ontinued progressive combus-. \.
<br />tIon. I .
<br />Plastic means a material that c~ntains as an essential ingre' .
<br />ent an organic substance of large molecular weigllt, is solid i /. ,
<br />finished state, and, at some stage in iits manufacture or in its
<br />essing into finished articles, can be sraped by flow.
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<br />Amend Section 502, page 33, to read: '
<br />1. Glazing area. The aggregate ;area of approved glazi
<br />rial in windows required by this article shall be not less t, ,
<br />of the floor area of the room serv~d by them; provide .,
<br />habitable rooms such glazing area shall be not less than .'
<br />feet, and in bathrooms it shall be n~t less than 3 square feef.
<br />2. Glazing. Only wired glass nbt less than 34 -inch thick shall
<br />be used for the glazing of fire win<<ows. Other windows shall be
<br />glazed with glass or other transluceht or transparent material hav-
<br />ing a flam.e spread rating not grea~er than permitted for interior
<br />finish materials. (See sections 402-4, 701-8 and 702-8.)
<br />3. Openings. Windows or other openings required for ventila-
<br />tion shall have an aggregate opena~le area of at least 50 percent
<br />of the glazing area required for lighting.
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<br />Amend Section 503-2, page 34, to reAd:
<br />2. Skylights. Unless open to ~he outer air at the top for its
<br />IuB area, such shaft shaH be covered by a skylight glazed and pro-
<br />tected as specified in section 923-4 a~d having a net area of perma-
<br />nent openings equal to the maximuP1 required shaft area.
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<br />(3). There shall be a distance of not less than 5 feet between
<br />skylights and not less than 20 feet between the skylights and
<br />any wall in which the exterior openings are required to be pro-
<br />tected by section 920. '
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<br />(4). Skylights shall be protected by a substantial wire
<br />screen placed above the glazing as provided in section 923-4 (c)
<br />unless they are constructed and installed in such a manner that
<br />flying brands will not be likely to lodge on the plastic.
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<br />Amend Section
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<br />4. Roof signs. I
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<br />(a). Display signs that are pla~ed above or supported on the
<br />top of a building or structure shall be tonstructed of noncombustible
<br />materials, except that mouldings and cappings may be of wood or
<br />other combustible material. I
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<br />4. Skylights.
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<br />(a). Skylights placed over shafts, vent shafts, stair enclosures,
<br />and exit ways required by sections 602 and 603, shall be glazed with
<br />glass or other noncombustible material which may be easily
<br />pierced by fire-fighting personnel. If glass is used it shall be plain
<br />glass not more than }i inch thick.
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<br />(b). Skylights other than as specified above, which are in-
<br />clined less than 600 from the horizontal, hereafter placed on a
<br />building shall have the sashes and frames thereof constructed of
<br />approved noncombustible material and "glazed with wired glass or
<br />an approved plastic which dO'es not present a fragmentation haz-
<br />ard; skylights in foundries or buildings where acid fumes are
<br />present may have sashes and frames of wood by special permis-
<br />sion of the building official.
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<br />(c). Every skylight in which plain glass is used shall be pro-
<br />tected by a substantial wire screen with wire not lighter than
<br />t'umber,12 gauge and having a mesh not less than ~ of an inch
<br />nor larger than 1 inch, placed not less than 4 inches or more than
<br />10 inches above the glazed portion of the skylight at all points.
<br />Such screen shall extend beyond the glazing on all sides a distance
<br />not less than the height of the screen above the glazing. When a
<br />skylight is located over a stairway, public hallway or a place of
<br />assembly, a similar screen. shall also be placed below the skylight,
<br />unless there is an intermediate ceiling light.
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<br />(d). Skylights in which 'combustible plastic is used shall be
<br />constructed in accordance with the following provisions:
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<br />(1). The skylight shall have a curb which is not less than 4
<br />inches in height above the adjoining roof surface,
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<br />(2). The area within the curbs of each skylight shall not ex-
<br />ceed 50 square feet and no 'dimension shall exceed 10 feet. The
<br />aggregate area of skylights shall not exceed 20 percent of the
<br />floor area sheltered by the roof upon or in which they are
<br />installed.
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<br />1802-4
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<br />3. A plastic luminous ceiling shall conform to the require-
<br />ments for interior finish materials ~see sections 402-4, 701-8 and
<br />702-8), except that a plastic luminous ceiling, the plastic panels of
<br />which have been shown in approprHite tests by a recognized test-
<br />ing laboratory to fall from their mO{1l1ting before being ignited by
<br />application of heat shall be exempt. from this provision provided
<br />the plastic panels are made up of individual lengths not exceeding
<br />10 feet each. i
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<br />4. No plastic luminous ceiling shall be installed below sprin-
<br />klers in areas required to be equippeq with automatic sprinklers by
<br />section 1702 or section 404, unless appropriate tests by a recognized
<br />testing laboratory have shown that such ceiling does not prevent
<br />effective protection by the sprinkled; or unless sprinklers are lo-
<br />cated both above and below the lumirous ceiling. .) .
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<br />5. The supports for plastic panfls of luminous ceilings shall ,...-
<br />be securely fastened in an approved manner to the ceiling, floor or~'
<br />roof construction. 1
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<br />Amend Section 1802-1 (b), page 155, 10 read:
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<br />(b) Such signs shall not exceedl40 square feet in area, unless
<br />made of noncombustible materials, :provided that mouldings and
<br />cappings may be of wood or other c01nbustible material.
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<br />Amend Section 1802-3 (d), page 156, )0 read:
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<br />(d). Within the fire limits, su~h signs when more than 13
<br />feet high shall be constructed of l1orlcombustible materials, except
<br />that mouldings and cappings may bel of wood or other combustible
<br />material. !
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<br />Amend Section 504, page 34, to read:
<br />Skylights installed to meet the requirements of this article
<br />shall be glazed and protected as specified in section 923-4 and shall
<br />have glazing areas not less than required for the windows they
<br />replace. They shall be equipped with movable sashes or perma-
<br />nent openings of an aggregate net area not less than required for
<br />openable parts in the windows they replace or approved ventilation
<br />of equal effectiveness shall be provided.
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<br />Amend Section 923-4,
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<br />Amend Article IX by adding at the end, page 113, a new section to read:f._,
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<br />SECTION 931. LUMINOUS CEILINGS. ..
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<br />1. Plastic luminous ceilings which fall from their mounting "
<br />upon application of heat shall not pe installed in any exit way
<br />required by sections 602 and 603, nor~ in public buildings for 100 or
<br />more persons, places of assembly, o~ institutional buildings.
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<br />2. The installation of a plastic iuminous ceiling shall be
<br />ject to the approval of the building ofti,cial.
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