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Ltr. J.Mahmoud <br />April 20, 2005 <br />Pagc 2 <br />(a) Pire walls are pennitted to tenninate at the intcrior surface of combustible <br />cxterior sheathing provided the exterior �vall has a fire-resistancc rating of at <br />lcast onc-hour for a horizontal distancc of at lcast 4 feet on both sides of the <br />tire walL Pire assemblics having a firc protcction rating of not less than '/. <br />hour sl�all protect opcnings ���ithin such cxterior walls. Exccption I to Section <br />705.5 <br />(b) Gmcrgcncy cscapc nnd rescuc opcnings may not bc locatcd �vithin this 4- foot <br />firo-resistivc arca. Scction 1025.4 <br />v) Thc firc wall should Uc shown to extcnd from thc foundation to a tcnnination point at <br />Icast 30 inches aUove thc lower roof Icvel (see cxceptions). Thc exterior wall abovc <br />that point should Uc shown as minimum 1-hour construction. Section 705.6.1 <br />(a) Unprotccted upcnings for attic vcntilation should not bc providcd in this arca. <br />Table 715.3 <br />2) Thc follo�ving commcnts apply to Partv Wall Dclail A/6: <br />i) Thc ���u!Is scparating cacli dwclling unit should bc rivo, distinct listed onc-hour <br />asscmblies or one, h��o-hour assembl}'. The listing should bc shown on the plans. <br />Scctions R302.1 & R317.2 <br />ii) Thc common �vall(s) scparating thc townhouscs must bc continuous £mm thc <br />foundation to lhc undcrsidc of thc roof shcathing per Section R317?.1: <br />(a) Solid blocking should bc providrd at thc rnn joist amas to thr tiill thickncss uf <br />thc walls above nnd/or bclo���. <br />(b) Thc attic truss abovc Uic ���all shuuld cithcr bc tn�o onc-hour tnissrs or onc <br />h��o-hour Uvss — listings should bc pruvidcd for cithcr option. <br />��) <br />L Listed wall assemblics may Uc uscd for similar construction <br />condilions. <br />iii) Parapcts conslructcd in accordancc �vith Scction R317.23 should bc providcd on top <br />01� lhe dwclling separation walls — sec exceptions for options. Scctioit R317.2.2 <br />3) An intcrconnected smoke alarn� should be shown on thc main tloor. Section R313 <br />4) A vapor rctardcr should Uc shown on thc ���arni-in-wintcr sidc of tlie insulation in �valls and <br />roof/cciling cicmcnts comprising thc building cnvclopa Scctiai R318.1 <br />5) Thc foundation plans indicatc that lhc undcr0oor access is to go Uvough thc kitclicn tloor — <br />plcase clarify Qie location on the m:�in tloor and foundation plans. Section R40S.3 <br />