Joing New Concrete Wall To Older One

You start the foundation with a footer or footing.

Joing new concrete wall to older one. A single wall no higher than 1 8 metres requires a 300mm deep x 300mm wide footing while a double wall or a wall higher than 1 8 metres should be 600mm deep x 300mm. Then build a perimeter or a wood brace that is the same height as you want the concrete to be. 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. The question is how many pins diameter embedded depth lenght of pin spacing and grouting material.

The edge of the existing concrete that was sawed should be drilled and doweled so the new concrete won t separate lift or settle from the old concrete. The new wall must sit on the same level foundation as the old wall. Some engineers require the edges of the existing footings and foundations where the new and old concrete meet be roughened. To lay new concrete sweep and clean the old concrete and saturate the old concrete with water.

I imagine it requires grouted pins. Both walls are 8ft high 10in width. After you ve brushed your slurry mixture onto the old concrete you can apply the new concrete that you mixed. Pour the new concrete on top of the old concrete.

You can join the new concrete right to the old concrete this is called a concrete construction joint. Even some require application of bonding agent to enhance the bonding. Make sure the braces are level and lay down a barrier of wire mesh over the existing concrete inside of the barrier. Those two pieces of vertical rebar help lock two different pours of concrete together.

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. Connect new foundation to existing. Where no foundations exist the new wall will not be on solid footings and will sag or crack. Dump out all of the concrete onto the old concrete and spread it out with a hand trowel or a paver to form an even layer.