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�ct- 15-99 07 : 13A 00 0000000 P _ 03 <br /> DcC 24 99 03: 2Sp John H. Dahlmeier E12-472-4761 p_ 3 <br /> )ohn l3lumentntt <br /> C7ctober 14, ]999 <br /> Page 3 �f 3 <br /> OBSE�tYAT�ON� AND COM_N�ENT5 <br /> I. The Code, however, allows thickened slab const,ruction for garages only, not <br /> combined occupancy. <br /> 2, Constructiou of garages withaut frost footings is practical sinCe frost heaving <br /> will not interfere with the uae of the strticture as a garage. Use of the space <br /> as a mixed occupancy with habitable space presents other issues. <br /> 3. The contractor reported that the structur� would he placed on a well-dra7Bed <br /> sand sub•grade. Granular materiaLs cause a minimum amount of frost <br /> heave. Therefare, I do not see any serious issues in altowing construction of <br /> the garage and storage space above on a thickened slab system. <br /> 4. In order to meet good construction practice, the fallowing modifications are <br /> suggested to the detail as attached: <br /> a. Provide two #5 at top �f thickened slab entire perimet,er of the <br /> stxucture. <br /> b. Widen buse of thickened slab to 12" tt� acconamodate bearing surface <br /> far additional load from storage area. <br /> 5. It is noted tbat some frost heave may occur causing some movement of the <br /> struCture. In fl�'deI' to mil�mize frost heave and/or damage frvm frost heave, <br /> the £olEowi.ng'recommeadations are offered for consideration: <br /> a, Extend thicken.ed sla� �0 30" dee�, or <br /> b. Place 2" of rigid insulation at the bottom of the fooring horizon�lly <br /> extending 2 feet beyond the bottnm of the footing entire perimeter of <br /> the structure. <br /> PROF'ESS�ONAL OPTrTION <br /> 6. It ts my professional engineeriag upinion that: <br /> �. '�'he garage can be constructed as shawn on the details and modiGed in <br /> this report. <br /> b. Some froSt heavc may oCcur, however, a2ternate schemes suggested <br /> will redu�e &ost heave. <br />