Slab-on-grade foundation
As the name suggests, a slab is a single layer of concrete, several inches thick. The slab is poured thicker at the edges, to form an
integral footing; reinforcing rods strengthen the thickened edge. The slab normally rests on a bed of crushed gravel to improve
drainage. Casting a wire mesh in the concrete reduces the chance of cracking. A slab on grade is suitable in areas where the
ground doesn't freeze,
In summary:
* Storage Buildings (work shops) are usaully 12" inches X 12" inches footings with a 4" inch slab ontop for North Carolina Codes
* The edges of the slab-on-grade are thicker than the interior of the slab.
* The slab-on-grade is monolithic (poured all at one time).
Under every house is a foundation, and under most foundations are footings. Most of the time we take footings for granted, and
usually we can: For typical soils, a common 16- or 20-inch-wide footing can more than handle the relatively light weight of an
ordinary house.
On the other hand, if you build on soft clay soil or if there's a soft zone under part of your foundation, there can be trouble. A footing
that performs well in good soil may not do so well in weak bearing conditions. We don't often see outright failure, but it's not
uncommon to see excessive settlement when soil bearing capacity is low. These are the reasons why every monolithic slab is
inspected by city or county inspectors before the slab is poured.
As the name suggests, a slab is a single layer of concrete, several inches thick. The slab is poured thicker at the edges, to form an
integral footing; reinforcing rods strengthen the thickened edge. The slab normally rests on a bed of crushed gravel to improve
drainage. Casting a wire mesh in the concrete reduces the chance of cracking. A slab on grade is suitable in areas where the
ground doesn't freeze,
In summary:
* Storage Buildings (work shops) are usaully 12" inches X 12" inches footings with a 4" inch slab ontop for North Carolina Codes
* The edges of the slab-on-grade are thicker than the interior of the slab.
* The slab-on-grade is monolithic (poured all at one time).
Under every house is a foundation, and under most foundations are footings. Most of the time we take footings for granted, and
usually we can: For typical soils, a common 16- or 20-inch-wide footing can more than handle the relatively light weight of an
ordinary house.
On the other hand, if you build on soft clay soil or if there's a soft zone under part of your foundation, there can be trouble. A footing
that performs well in good soil may not do so well in weak bearing conditions. We don't often see outright failure, but it's not
uncommon to see excessive settlement when soil bearing capacity is low. These are the reasons why every monolithic slab is
inspected by city or county inspectors before the slab is poured.
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