Footing depth, ground level low one side

[martysmarty]

Hi guys.

Got to dig trenches out for our 4x4.5m extension. I have manually dug foottings near the services, digger coming wednesday if all goes to plan (given current situation)

Now, we know we have to dig minimal 1m down, good ground is hit at 500mm so 1m sould be max. The possible problem is, on our boundary side where we are joined to neighbours, the ground level on their side has been lowered last year, its not fully been taken away but quite weak at the edges. Would i need to dig 1m down on that side from their "new" ground level or my "original" ground level.

Picture is added to show. As you can see the ground goes away near the outside corner of the footing.

 

[cdbe]

Do you have to dig down 1m? My BCO told me that 450mm (same as existing house) was fine.

 

[Notch7]

Now, we know we have to dig minimal 1m down, good ground is hit at 500mm so 1m sould be max. The possible problem is, on our boundary side where we are joined to neighbours, the ground level on their side has been lowered last year, its not fully been taken away but quite weak at the edges. Would i need to dig 1m down on that side from their "new" ground level or my "original" ground level

you need to dig down far enough to reach load bearing ground that is stable. there is a min depth for frost protection -I think in the UK the frost line is 450mm

 

[martysmarty]

Hi guys.

Yes far as i know it needs to be min 1m, il double check but pretty sure.