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a • ' <br /> r <br /> � ' �• �' � , ... • <br /> ONE- & TWO-PpMILY R�SIUENTIAL DUJZ,AJ]yG PRF�cqupT.ry� (COOK-BOOKj <br /> API'ROAC�i <br /> MAXIMUDvI WtNDOW AND DOOR AREA AS A PERCENT OF OVEItALL WALL <br /> AREA <br /> F���Mtnn $ules art 7670 0475 •+ F�tt 2. ttem F <br /> - Cavit ExterioY Window U-Fattor <br /> - Eramin Inaulalion Sheathin 0.49 0.36 0.31 p,2� <br /> STANDARD R-13 Z R - 7 13.49�• �7.g°/. 21.39'. 24.3% <br /> STANDARD R-�3 R- 5 12.4?'. 16.4% 19.7°�0 22.5qo <br /> S7ANDARD R-15 R - 5 12.996 17.1°/. 20.1% Z3.�% <br /> STANDARD It-l8��g � R - 5 1Z.19'e 16.09�i �8.8% Z2,p�/a <br /> STANDARD R-18_19 R - S 14.096 18.6°Yo 21.8% . 25.3% <br /> . ADVANCED R-le-i9 < R - 5 1Z,g9L 17.19'0 20.19'„ 23A% <br /> ADVANCED R-18-19 Z R • 5 14.59'e 19.29'0 22.'S'�'o 26.1% <br /> S?ANDARD R-21 < R�- 5 12.8°/. 17.0°Yo I9.99'e Z3,la/„ <br /> STANDARD R•21 > R - 5 14.5°/. 19.3°16 22.5°!�0 26.]% <br /> ADYANCED It-21 < R - 5 13.6°�6 18.1% 21.2% 24.6% <br /> � Af7VANC�D R-2l R - 5 15.09'a 19.9% 23.29'0 26.9"/0 <br /> � v � <br /> STANDARD R-17 < R - 5 11.9°Yo 1�5.79'0 18.4% 21.5% <br /> STANDAIZD R-17 �R - S 13.8°Yo 18.4'/0 . 21�5% 25.0% <br /> ADVANCED R-17 < R • 5 12.6% 16.8q/o 19.69'0 22.9°J'o <br /> ADVANCED Ii-17 R - 5 14.396 19.Q°Yo 22.29'e 25,7"yo <br /> Notea: ' <br /> Window �rea equals rough opening minu� in�t�llatlon cleArancea. <br /> Window U-Eactor must be determined by either the National Fenestratlon Rating ' <br /> Cauncil standard 100-91, or ASNRAE 1993 Nal�dbook of Fundamenlals, Chapter 27, � <br /> Table 5. <br /> . <br /> Po�t•It'Fax Note 7g71 0� �� <br /> � �rom <br /> �.�� Co. <br /> • p�aM� rt <br /> r..• u� <br />