Concrete Foundation Wall Rebar

Rusting and exposed rebar can reduce the structural strength of concrete.

Concrete foundation wall rebar.

As a minimum 4 rebar 1 2 inch is spaced vertically at 36 inches on center continued to within 8 inches of the top of the wall placed on the tension side the inside face of the wall. Strength reduced from 136 7 to 114 9 in kips. The placement size cover tying and tolerance in steel reinforcement are considered to achieve ultimate efficiency of the footing. Lap the additional rebar to the adjacent bar for a minimum of 18 inches and secure with tie wire.

If your wall is over 40 feet long it will add 2x the amount of overlap required. Pour the footing concrete. Most basement and concrete foundation walls are a minimum of 8 thick. If your wall is over 20 feet long it will add the amount of overlap required.

Ready mix concrete costs 119 to 147 per cubic yard and an 8 inch thick basement wall measuring 12 x 8 will use 2 37 cubic yards of concrete so concrete alone costs 282. Resulting in cracks weaken foundations and slabs as well as leaks in basement walls. Although concrete is a very durable material and is great for supporting huge amounts of weight. 2 5 clear to strength steel 5 12 rather than the designed 5 10 bending strength of the section has been reduced by about 16.

Allow the footings to fully cure before building the concrete block wall. Remember that plain concrete sometimes called unreinforced doesn t mean that there s no reinforcing steel only that the steel strength is not relied upon in the design. The steel is there to hold any cracks. Thus good placement of horizontal and vertical rebars in a footing is of utmost importance as placing concrete.

Install the additional lengths of rebar where the vertical rebar uprights need to extend to the top of the concrete block wall. Strength of reinforced concrete sections amount of rebar a s the project calls for 5 10 and 5 12 are used. It s not great for tensile strength unless it has reinforcing in it such as rebar. An 8 inch poured concrete wall costs 12 75 per square foot or 1 224 poured on average.

Steel reinforcement forms an important part of concrete foundations. Not all surfaces need concrete rebar reinforcement but adding it makes concrete stronger and more resistant to large cracks. This calculator assumes that you are using 20 foot long lengths of rebar. Contents placement of rebar in footings1.

In aci 332 section 8 2 8 discusses horizontal reinforcement for both plain and reinforced concrete foundation walls. Calculate the amount of rebar needed for reinforcing a wall.