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h�H`r'—�_��—''�y FF'I 15:5'� I Li:HF'i_HHL�ECK: Tlxl I F-J�_I T I E'� TEL F•JO:ti 1�. �'�1. ��n=�11 t#5�� F'�=�1 <br /> ABBOTT, ROBINSON & AS5�CIATES, INC. <br /> CIVIL ENUINEERING AND BUILDING CODE CONSULTANTS <br /> .� - <br /> TWIN CITIES 5389 RIVER WOOD DRiVE SAVAGE,MINNESOTA 55378 (612)940-2574 <br /> SOUTHEAN MINNESOTA 1321 OXFORD STREET WORTHINCiTON,MINNESOTA 58187 (507)378-fi266 <br /> MarC1130. 1987 <br /> &II Men9ch <br /> Am.hadeck of the Twin CRies <br /> 12030 Mayfiower Cim,le <br /> Minnetonka, MN 55305-2829 <br /> RE:Allowable joist carrtilever length <br /> Dear Bill: <br /> _ You had reques�ed that we provide a strudural analysis of the stresses associaied with cantilevering <br /> dedc joists three feet. Our analysis was based on the 1994 Uniform Building Code which had adopted <br /> the 1991 National Design Specifications (NDS). The allowable design values for both 2x8 a�d 2x9 0, <br /> #2 southem yellow pine jasts wene used in de�termining allowable stresses. Calculations assume a <br /> dead load of 10 pounds per squar�e toot, and a live load of 80 pour�ds per squar�e foot. <br /> A three foot car�tl{ever using?x8 flaor joists at 16'o/c or 2x10 floor joists at 24' o/c are well within <br /> the allowable bending and shear stresses of ihe Building Code. In l�oth cases, the deflec:tions are we11 <br /> within fhe allowable defledion of U240. <br /> We reoommend the acceptance of carnilevers up to and including three feet for ihe species of wood <br /> I#sted above. <br /> 1 hereby cenlfy that thls �ian,speclflCatlop, <br /> Sin ly, or repor# was preparad by me or under my <br /> ���' " "' c4ir�ct su��rvision snd that I am a duly <br /> '`��;atere Prafessional En ineer under <br /> t'� of the tate f ' <br /> Gene J. rbott, PE <br /> ```���tiN�{����ryii��� Date � � '7 Reglstrailoa No. o?a1a�(Oo <br /> . `�````�Ja�NE�.�qeeo��''i <br /> � : �'•;�' i <br /> � :� REQISTEREO '• = <br /> c � AROFESSiOHAI ; � <br /> ~ • EN�INEER � � <br /> . <br /> � :� 22i08 : � <br /> �`�►�'• .•'P � <br /> ���''7�,/��"�`�```�� <br /> H <br />