Over time this expansion and contraction especially if they occur at different rates due to the sections of concrete being exposed to different temperatures will work the sections apart and the crack will widen.
How to install concrete wall ties.
Some installers fasten all the ties to the wall before starting the brick.
To form a concrete wall first set up plywood boards on either side of your concrete footer and attach them together with wire.
A form tie is an accessory used in formwork used to hold the concrete wall forms firmly against the lateral pressure of freshly placed plastic concrete.
Concrete snap ties are metal rods featuring button ends spreader cones and tapered spots which allow you to snap the excess part of each rod off easily once the poured concrete dries.
They maintain equal space between the forms which results in uniform thickness of walls.
Then pour your concrete inside the form using a chute or hose attached to the mixer.
Snap tie concrete forms are a simple and easy system for foundation walls.
On these jobs we often see corrugated ties folded so that the horizontal leg the one embedded in the mortar joint is above the vertical leg nailed to the wall.
Presumably the ties lined up that way up when the bricklayers reached them.
Snap ties are available in a variety of sizes including 8 inches 12 inches and 24 inches to accommodate most concrete form projects.
A form tie contains two parts namely internal tension member and external holding device.
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When joining new concrete work to old concrete work the joint will always develop a crack and will be a point of expansion and contraction.
This snap tie forming method is used for retaining and standard walls batter walls bridges concrete signs footings etc.