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. <br /> R;302.11.1 Fireblocking m�at+erials• Except as provided in <br /> Sec�ion R3U2. 1 l, Item 4, fireblo�king shall consist of the <br /> following materials. <br /> 1. Two-inch (51 r��m} nominal lumber. <br /> 2. Tv�o thicknesses of 1-inch (25.4 mm) nominal lum- <br /> ber with broken lap joints. <br /> 3. Qne thickness of 23/32-inch {18.3 �c�.m) wood struc- <br /> tura.l pa�els with joints ba�cked by ��13�-inch {18.3 <br /> �r�.�m} wood structural panels. <br /> 4, C)ne thickness af 31 -inch (19. 1 r��.m) par�iclebaard <br /> . . . �` 3 • �� article- <br /> w�th �olnts backed by /�-inch {19. 1 ) p <br /> baard. <br /> 5. (�ne-half-inch (12.7 mm) gYpsum board. <br /> - -' me�t-based millboa��• <br /> 6. t)ne qua�rter lnch (�.4 �im� ce <br /> 'neral v�ool or lass fibe� �or <br /> 7'. B atts ar blankets of m1 � r <br /> ' s installed in such a m�'ne <br /> ot�.er ap�rovea� mat�r�a1 <br /> as to be securely reta�in�d in plac+e. <br /> 1 . • ted for �e ��� <br /> 8. �ellul+ose Insu�ation lnstalled as t�s <br /> ci�c appli�at�on. _,��� <br />