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St. Barbara Catholic School <br />Project No.: D-6289-01 <br />CITY OF SANTA ANA <br />Planning and Building Agency <br />may, lS. <br />Approved <br />FOR PERMIT ISSUANCE <br />therefore, special measures will not be required for expansion potential. It is <br />recommended to excavate the subgrade for slab on grade and keep the mmf6 fl: to 2% <br />Date: <br />above optimum) at top 12 inches and the slab be incorporated with reinforcement of #3 <br />bars 12 inches center to center each way. The slab thickness should be 4-inches minimum <br />and shall be placed over approved subgrade. However, the structural engineer should <br />design the thickness of the slab. <br />It is also recommended to provide capillary moisture barrier under slab on grade where <br />moisture would be detrimental. <br />Soil Moisture Considerations <br />Foundation systems and slabs shall not allow water or water vapor to enter into the <br />structure so as to cause damage to building components, or to limit the installation of the <br />type of flooring materials typically used for the particular application. Therefore, the <br />following should be considered by the structural engineer/foundation/slab designer to <br />mitigate the transmission of water or water vapor through the slab. <br />• The concrete slab (where moisture is detrimental) should consist of a 15-mil vapor <br />barrier, stego wrap or equivalent, with all laps sealed per manufacturer's <br />recommendation. The vapor retarder should be installed per the recommendations <br />of the manufacturer. In order to break the capillary rise of soil moisture, the vapor <br />retarder should be underlain by minimum 4-inches of 1/4" crush rock subjected to <br />several passes with a walk -behind vibratory compactor. 3/4" crush rock should <br />have the following gradation requirements: <br />1. 90 — 100 % Passing on Sieve 1/4" <br />2. 1 -10 % passing on Sieve No. 4 <br />3. 0 — 3% passing on Sieve No. 100 <br />18 <br />