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How much of 1 meter depth trench to fill with concrete


Paul Alan

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Normally trial holes next to the existing building are dug to determine this info and let the structural engineer design the foundations.

 

Layers of mesh in the concrete,

potential method of tying into existing foundation, ie rebar resined into existing foundation and into new trench.

 

best to ask the SE 

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45 minutes ago, Paul Alan said:

Morning 

 

We have found our existing property foundations to be 1 meter below ground.

 

How much of that depth will need to ge filled with concrete please?

 

The foundations should be dug out by Thursday and BC are coming that day.

 

Many thanks 

 

Assuming that the BCO is happy with the depth, i think trench fill is usually poured to 150 mm below the ground level

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9 hours ago, Moonshine said:

 

Assuming that the BCO is happy with the depth, i think trench fill is usually poured to 150 mm below the ground level

They'll be here soon, I hope we don't have to go any lower.

 

The house foundations are 1 meter down but the concrete only looks 200mm at most?

 

I thought we might have to follow suit?

 

Many thanks 

 

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12 hours ago, Paul Alan said:

Morning 

 

We have found our existing property foundations to be 1 meter below ground.

 

How much of that depth will need to ge filled with concrete please?

 

The foundations should be dug out by Thursday and BC are coming that day.

 

Many thanks 

 

 

 

Ideally fill until a whole number of brick/block courses below DPC. Normally for "fully filled" I think that's 3 brick courses (or 1 block). Otherwise 6 brick (2 blocks).

 

I think the minimum depth of concrete is 450mm but best check. 

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59 minutes ago, Temp said:

 

Ideally fill until a whole number of brick/block courses below DPC. Normally for "fully filled" I think that's 3 brick courses (or 1 block). Otherwise 6 brick (2 blocks).

 

I think the minimum depth of concrete is 450mm but best check. 

Good consideration 

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