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<br /> ; � �i€ 6-2 Construction and Gompartmentation i 153 �
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<br /> -b . " 'ng or raof/ceiling assembly. Because the ceiling �
<br /> t �:�?�. 1-Hour
<br /> �� es�not pravide �he appropriately rated fire bar- FioQr�
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<br /> �.�",:� ""�stwhich the wall assembly can ��e terminated� Ceiling
<br /> ''� airier rnust extend from slab to slab. ASS�"'biv , ,
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<br /> � ��e tests reported by the Gypsum Association in
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<br /> �;,�� "�Zesistance Design Manual 8 that mdicate that two F ira Bareier
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<br /> �},�: dy�;�/�-in. (1.6-cm} fire-rated Type X gypsum walI-
<br /> ''�, ��iplied at right angles to the underside of nomi- ' '
<br /> �.#;,;� ��iX 10 in. {nominal 5 cm x 2S cm} wood joists,
<br /> t�� '�k4,in. (61 cm) an centers with the face layer af ,Floor !
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<br /> � &t�m board affset by 24 in. {61 cm) fram the base --�— �
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<br /> �zr ,utts,will provide 1-hour fire resistance protection j
<br /> !}{{ a��; 1-Hour
<br /> �s:� •iy�pd framing.Using this inforr�atian,the auehar- ce�r��
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<br /> t�tg jurisdiction could judge that such a'ceiling �
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<br /> � •�te intent of the Except�on Co 6-2.2.2 and allaw �9re Barrier {
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<br /> ;��� ��iour fire resistance rated wall assembly ta termi- �
<br /> �'��, '�'�tIy against the underside of the ceiling. �
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<br /> �;6-2 shows a 1-houx fire resistance rated wall Floor
<br /> ';�� �_'�.cantinuing up tl�rQugh tt�e ceiling and vaid space � '
<br /> '>>�� ° �qur fire resistance rated floar/ceiIing assetnbly so Figure 6-2. Fire 13arriers Must Cxtend Through Ceili�'tg Spaces
<br /> r:" a'�"�"• ' Unless the Ceiling Is Itself a Fire Barrier. i
<br /> •�� �mtnate tightly against the underside of floor slaU
<br /> �'� �tp�'achieve the required vertical continuity. At the of Pire Tests of 13uilding Constrz�ction andMaterials.z The Y
<br /> �`� �'Sde,af Fi ure 6-2 the Exce taon to 6-2.2.2 is uti-
<br /> r,�3. g , p tesc is also commonly known by its ASTIvI designatlan,
<br /> t��� �'s;allow for the 1-Iiour rated walI assembly to ter- ASTM E119 (same tirle).9 The NFPA 251 /ASTM E119
<br /> �� � P 9 tesr standard rovides for tl2e construction of the artic-
<br /> '';�a at a ceilin that rovides the re uired "1-hour of
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<br /> ;��� 'istance rating iay itselE. ular assembly to lie rated and the actual testing of the
<br /> _'�° ��''�occupancies do allow the Eire barrier ro tercni- assembly in the test fiirnace.The test is conducte'd under
<br /> -,�� , ;tEie.underside{i.e.,ceil`tng} of a fire protection rated very rigid conditions so thac test results on tlie same
<br /> hf�` ' 'in assembl . However caution must be exer-
<br /> �� ��,w,; g Y � assembly are reproducible, and tests of different assem-
<br /> ': st�zce ceilings of these assemblies are aften improp- �lies are comparabte.Temperatures in the furnace are gen-
<br /> ��., t'led or,once instal(ed, have been violated durmg erated m strict accordance with the standard time-
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<br /> �; maintenance.
<br /> .�Y. temperature curve and reach levels of 1000�F, 1300°F,
<br /> re,f, -��t%;; �
<br /> �,g �.- 1550°F, 1700°F, and 1850°F (538°C, 704°C, �843°C,
<br /> se:._ ��4;: � y ° } p � a �
<br /> te Bacriers. 927 C and 1010 C at time eriads of 5 10,30 `&0 and
<br /> o� i��," 120 minutes into the test. Tenzperatures both in ithe fur-
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<br /> „°' ��Ffoar-ceifing assemblies;bearing and nonbearing wall nace and on tl�e unexpased side af the assembly bein�
<br /> .t� C'n assemblies used as fire barriers to form fire com- tested are monitored closely at speciEied intervals and loca-
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<br /> �,� ts;and oaiumns, beams, girders,or trusses support- tions. During t17e course of'ti�e test,cotton waste iS�placed
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<br /> �ssemblies shall be of a design that has been tested against the unexposeci surface and abserved for Elaming.
<br /> n�� �}!'ite conditions of aceeptance of NFPA 251, Standard During tlie test, the assembly being tested is alsoi loaded
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<br /> A ofFire Tests af Building Construction and Materials. the saine way that it would be expected to be iloaded
<br /> 'u! �ers shaU be continuous in accordance with 6-2.2.2. when in place in a builciing. I
<br /> ��''` Acceptance criteria far an assembty to camplete;the fire
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<br /> ��te resistance oE a fire barrier is determined by the test successfully Eor a specified ume peraod include the
<br /> 2_o �,`thod described in NrPA 251, Star�dard Methods follawing: ', �
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<br /> ''�� ��;. LIFE SAFETY CODE HANDBOOK
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