Pouring stepped footing

[mfarrow]

Hi, I'm just wondering how this is done? Do you need special concrete at all which wont flow so much? If so will i need to hire a poker?

The step is 300mm with a 600mm overlap.

Thanks
Mike

 

[KenGMac]

Usual way of achieving this is to fix a Shutter 300 MM High at the correct height, problem is that to restrain the vertical shutter you need to drive posts into the sides of the foundation, this can introduce loose dirt on to the foundation surface.

There is another problem, if the Shutter, restrained by the posts driven into the sides of the Excavation moves of Plumb it can cause some issues with the bricklayer

A mix of horizontally driven restraints, plus two vertically driven posts, driven into the formation level then removed immediately after the Concrete is poured, you do not want a lump of timber embedded in the Foundation.

Trying to restrain a Shutter from above just does not work the forces acting on the Shutter especially when using a vibrating Poker will simply displace the Shutter.

Ken

 

[mfarrow]

Thanks Ken.

Will this be OK with standard GEN1/ST2 concrete, i just have nightmares about it all slumping through the hole and building itself up to the same height on the other side!?

The step is quite near the corners so might have to go deep down with the pegs.

 

[KenGMac]

Mike, hi again.

Suggest you have a word with the Concrete supplier, I assume the Concrete will be delivered? and ask them to provide a stiff mix that will move but not run like porridge?

One thought is as I am sure you are aware the top of the Foundation needs to be level all around the top surfaces so the brick layer has a level surface to start off from?

Or? have a look on U tube? everything about anything is on there?

Ken

 

[mfarrow]

Ken

Many thanks, I'll be putting level points in around the trench to make sure it's flat for the block laying.

Time to get LABC out.