This is what I'm up against

[flanagaj]

The sectional drawing that the TA did for the split height between the garage and the house is below.   So it shows a stepped footing, but the crucial detail is missing.  I have learnt a valuable lesson regarding "If you pay peanuts ..."

As a result, I am going to play it safe and simply pull the footings through level and just suck up the additional muck away cost, blocks and labour ..

I am surprised BCO didn't say "I want to see detail as to the proposed horizontal overlap and where the step up will be placed relative to the internal cavity wall"

[ETC]

What’s the issue(s)?

[flanagaj]

8 minutes ago, ETC said:

What’s the issue(s)?

The detail of the step footing.  I understand that regs require you to have 2 * the height overlap in the horizontal plane.  What I am trying to work out is how you do the step.  Would you just step up 450mm in one place and if so, how does the bricklayer tie the block courses into the vertical face of the stepped concrete?

[ETC]

What have you done so far?

[BadgerBodger]

Yeah, I’m struggling here. 
 

two ways of doing this depending on skills of the groundworker 

 

easiest and simplest is cast the lower footing. wait. Cast the higher footing with desired overlap using shutters. Repeat as required for desired. No. Of steps and lay of the land. 
 

better would be a monolithic pour but but more demanding on skill. 
 

bricklayer doesn’t need to tie in to the step per se unless for some reason engineer says he should. If he did need to engineer would specify requirement I.e screw tie, resin helical, frame tie etc

 

seems unlikely though 
 

 

[ETC]

The detail of the step footing.  I understand that regs require you to have 2 * the height overlap in the horizontal plane. Correct.

 

What I am trying to work out is how you do the step. Either form it in timber or blockwork.
 

Would you just step up 450mm in one place and if so, how does the bricklayer tie the block courses into the vertical face of the stepped concrete? The bricklayer won’t - the sub-floor blockwork work should be built solid and tied above the step.

[flanagaj]

I was planning on pouring this all in one shot using a pump.  The only part of the step footings I’m scratching my head about, is the distance that I need to allow after the internal cavity wall which is at a lower depth.  I have drawn the step footing below, but don’t know where the step goes in relation to the lower 600mm footing.

[trialuser]

In my view that drawing is not intending to show a stepped footing, it shows footings at different depths. Where the section 'sections' the building there  are no footings other than those show. To see the details of the step it needs to be a simple diagram side on of the trench / footings, or a section in the same plane through the side wall perpendicular to the walls shown.

Not sure I'm explaining myself very clearly, but that section is through the (say) middle of the building, the step in the footings will be in the walls that join the two walls shown, I think!