10915 16TH AVE SE 2016-01-01 MF Import

! CASCADE GEOTECHNICAL December 2 , 1987 Job No. 8711 -20G Seattle MoYtgage Page 4 gravel is suit.��l.e Gor r.he sep�ort of spread Eool•inqs design�d to a nominal bearina value o£ 2000 p.s .f . if the soil is un3isturbed, free of organic ma'terial and does not become wet orior to concrete placement. The footings should be placed a minimum of eighteen ( 18 ) inches below the outside finished grade for frost protection. A minimum width of eiqhtecn ( 1II) inches should be mnintained for all foot- ings . Drainaqe We recommend placing a perforated drain pipe e.iong the base of the footinos and '�.ightlining it away from the bu.ilding area to a suit- able drainaqe outlet. The drain pipe should be surrounded with a minimum of four (4 ) inches of pea gravel . We recommend tiqht•lining the roof downspouts to a suitabl� drainage outlet separately from the footing drains . Slab on Grade Floar We recommend placing a minimum of four (4 ) inches of free draining material between the slab and slab subgrade to act as a capillzry break. The free draining material could r_onsist of a clean sand or crush�d rock which has less than five ( S ) percent material passinq the N200 sieve, based upon the fraction of material passing the #4 sieve . We recommend placing a vapor barrier between the matecial used for a capillary break and the bottom of the slab. Slab cracking during curing may be reduced by placinq two (2 ) inches of a free draininq sand over the vapor barrier .