Laserfiche WebLink
The clayey sand fill and soft silt removed during soil corrections are not suitable for reuse as <br /> structural fill or backfill. Likewise organic soils such as topsoil or soils that are black in color, <br /> if encountered,are not suitable for use or reuse as structural fill. <br /> Foundations We assume the garage will be unheated. Foundation elements in unheated <br /> areas should bear at least 5 feet below exterior grade for frost protection. <br /> We anticipate the foundations and floor slabs will bear on compacted engineered fill or native <br /> clay till soils. <br /> It is our opinion the footings can be designed for a net allowable bearing pressure up to 2,000 <br /> pounds per square foot(psf). <br /> We anticipate total and differential settlement of the foundations will be less than 1 inch and <br /> 1/2 inch,respectively. <br /> 4.4 Interior Slabs <br /> The anticipated floor subgrade is granular fill overlying the native clay till soils at depth. It is <br /> our opinion a modulus of subgrade reaction, k, of 200 pounds per square inch of deflection <br /> (psi)may be used to design the floor. <br /> If floor coverings or coatings less permeable than the concrete slab will be used, we <br /> recommend that a vapor retarder or vapor barrier be placed immediately beneath the slab. <br /> Some contractors prefer to bury the vapor barrier or vapor retarder beneath a layer of sand to <br /> reduce curling and shrinkage,but this practice often traps water between the slab and vapor <br /> retarder or barrier. Regardless of where the vapor retarder or vapor barrier is placed, we <br /> recommend consulting the floor covering manufacturer regarding the appropriate type, use <br /> and installation of the vapor retarder or vapor barrier to preserve the warranty. <br /> We recommend following all state and local building codes in regards to a radon mitigation <br /> plan beneath interior slabs. <br /> 4.5 Below Grade Walls <br /> We assume the new garage will be a slab-on-grade structure and therefore do not anticipate <br /> any below grade(basement)walls. <br /> 4.6 Exterior Slabs <br /> Portions of the exterior slabs may be underlain by clay till soils which are considered <br /> moderately frost susceptible. If these soils become saturated and freeze, frost heave may <br /> occur. This heave can be a nuisance in front of doors and at other critical grade areas. One <br /> way to help reduce the potential for heaving is to remove the frost-susceptible soils below the <br /> slabs down to bottom of footing grades,and replace them with non-host-susceptible backfill <br /> consisting of sand having less than 5 percent of the particles by weight passing the number <br /> 200 sieve. <br /> 5 <br />