porch footing depth - with solid limestone 400mm down.

[InTheBeginning2007]

I am digging out for the footing for my new brick porch. I was planning to dig 600mm down and 450mm wide, but 400mm down I have hit solid limestone.

It is not that hard -as far as rock goes, but it is going to be a lot of work to break it up with the SDS drill and dig out another 200mm.

Do I need to?

I was planning to fill 300mm, with 2 bricks on top and then DPC. Could I just raise the footing and use one brick below DPC level?

Thanks.

 

[noseall]

[quote="InTheBeginning2007"

It is not that hard -as far as rock goes, but it is going to be a lot of work to break it up with the SDS drill and dig out another 200mm.

Do I need to?

provided the stone is not superficial and has a protracted depth then i can't see you benefitting from digging out a lot more.

I was planning to fill 300mm, with 2 bricks on top and then DPC. Could I just raise the footing and use one brick below DPC level?

you will need to show at least two courses of bricks below the dpc. the rules state, external ground level should be 150mm below dpc.
[/quote]