SU0005352_SSNL - Laserfiche WebLink

Home Browse Search

Escalon Subdivision Page 5 May 30,2000 House Foundations If grading is accomplished as specified, foundations may consist of conventional spread footings and concrete slab-on-grade. Minimum width of continuous footings is 12 inches. Footings should be carried to a minimum depth of 12 inches for single story and 18 inches for two story. Footing reinforcement should be designed by the structural engineer,but as a minimum should be continuously reinforced with 144 bar top and bottom(total of 2 bars). Foundations constructed in ` this manner may be loaded to a bearing capacity of 2500 pounds per square foot total load. Bearing capacity may be increased by 1/3 for temporary wind and seismic loads. Potential settlement,either ` immediate or long term, of foundations constructed and loaded in this manner should be less than %2 inch total and 1/4 inch differential. Floor Slabs Four inches of clean gravel should be placed beneath the slabs-on-grade. This gravel should r be well graded between a maximum size of 1 inch and a minimum size of 1/4 inch with zero percent passing the No. 4 sieve. The gravel should be covered by an impervious vapor barrier such as 10 mil visqueen or equivalent. The visqueen should be covered by 1 to 2 inches of sand to protect it �- during construction and to aid in curing the concrete. If extra care is exercised to prevent the migration of capillary moisture or moisture vapor up through the floor slabs, such as doubling the visqueen layer,sealing any penetrations,and draping the visqueen to the bottom ofthe footings,then the gravel layer under the slabs may be eliminated. It is recommended that the slab be a minimum of 4 inches thick and reinforced with fibermesh, 6 x 6 x 1.4mm x 1.4mm (6x6x1 OXlO)wire mesh, or#3 bars at 24 inch centers both ways. If welded wire fabric is chosen,sheets should be specified in-lieu of rolls to ensure more accurate placement within the concrete slab. Tests and Inspections It is recommended that our office be afforded the opportunity of reviewing the completed foundation and grading plans to verify that our recommendations have been properly interpreted and incorporated. Unless our office is allowed this opportunity, we disavow any responsibility from problems arising from failure to follow geotechnical recommendations or improper interpretation and implementation of our recommendations. It is also recommended that our office be retained to perform the recommended grading control and compaction testing. Unless we have been retained to provided these services,our office cannot be held responsible for problems arising during or after construction that could have been avoided had these services been performed. The fees for these services are in addition to that ` associated with this report. P?�E q10 y O ° 0 P V