Placing footing per frost depth code#

Bar supports are not intended as support for construction equipment such as concrete pumps, buggies, or laser screeds.This type of tie is used to secure heavy mats.Įxtra Information on Footing Rebar Placement Detail E: 'Figure Eight Tie' can be used on walls in lieu of the saddle or wrap and snap ties.Detail D: 'Wrap and Saddle Tie' ) is similar to the saddle tie except that the wire is wrapped 1-1/2 times around the first bar, then completed like Detail C.They are commonly used for securing ties to column corner bars and stirrups to beam corner bars. Detail C: 'Saddle Tie' is more complicated than snap ties or wrap and snap ties.Detail B: 'Wrap and Snap Tie' is normally used when tying vertical wall reinforcement to hold the bars securely into place.Detail A: 'Snap Tie' is the simplest and is usually used for rebar in a flat horizontal position.There are different ways in which the tie wire is tied to the rebar depending upon the situation n place were they are tied. Be sure to keep the ends of the tie wires away from the surface of the concrete where they could rust. When tying bars, there is no need to tie every intersection - every fourth or fifth is normally sufficient. Care must be taken to keep the ends of tie wire are away from the surface of the concrete where they could rust. Tying of all intersection is not needed, every fourth or fifth is normally sufficient. To tie the rebars, tie wire is used which is typically 16½ - or 16-gauge black, soft, annealed wire, although heavier reinforcement may require 15- or 14-gauge wire to hold the proper position of the rebar. Though the tie steel does not contribute to the strength of the reinforcement, it is used to secure and prevent the rebars from displacement during construction activities and concrete placement. The distribution ratio of length to short side is calculated based on the aspect ratio of footing as -īar supports are used to hold the reinforcing bars in place to attain the proper depth of cover.įor proper placing, rebar supports are used which comes in many sizes and of different materials such as steel wire, precast concrete, or plastic.Ĭhairs and supports are available in various heights to support specific reinforcing bar sizes and positions.

Placing footing per frost depth code#

In a rectangular footing, rebars in the long direction are placed uniformly but not the short direction.ACI code (15.4.4.2) requires a certain portion of reinforcements in a short direction to be placed within a band equal to the width of footing in the short direction. In a square footing, rebars are placed uniformly in both directions. ACI code requires that the rebars be placed not more than 18 inch apart. It is a general rule that reinforcements should be placed at the tension side at the bottom of the footing. slabs, walls, and joists - #14 and #18 bars - ½ inch.For concrete not exposed to weather or in contact with the ground:.For concrete exposed to weather or earth (such as basement walls).For concrete cast against and permanently exposed to earth (such as footings) - 3 inches.Additionally, water and sewer pipes need to be placed below the frost lines as well.The minimum cover for cast-in-place concrete is specified by the ACI 318 Building Code. For this reason, building codes will consider frost lines and build the foundations below the line. Frost heaving, which is the upward swelling of soil during freezing conditions, can move the foundations of buildings, severely damaging them. When water transitions from liquid to solid, it expands 9% in volume. Florida and Hawaii are zero inches, Louisiana and South Carolina's are four inches, followed by California and Georgia with five.įrost lines can be important for building construction and are taken into consideration when laying a foundation. Alaska's is the deepest at 100 inches, followed by Minnesota with 80 and North Dakota with 75.