In the build up to having a new structural slab installed the existing slab has had to be broken up.

The groundsworkers have gone to town with the use of their breaker and created a bit of a mess here on a single storey block wall.

Had my builder round today who wasn't impressed at all, but whilst I wait for the structural engineer to visit (hopefully tomorrow) I was looking for advice if anyone has in order to rectify.

1 suggestion me and the builder made today was put needles through at intervals, and prop using mini acrows. Most likely need to create a solid foundation for the acrows.

Then remove all the earth and old slab, before digging a new footing underneath and building up with bricks/blocks for this wall to sit on.

 

Any other suggestions welcome whilst I sit and worry a bit about this stage!

SE was a good plan.  What is the wall supporting?  Hopefully you will be able to add a decent amount of insulation under or on top of the new slab.

It's a single storey block wall and the long part I believe has been created for the staircase stringers to fix into.

The short section has a small RSJ coming off it to the external wall. Looks like this is to provide support for the timber joists.

Above both sections, is a simple stud wall diving the bathroom/landing and bathroom/bedroom.

Got 200mm PIR going on top of the sand.

So SE came round today and due to the state of the concrete slab under the wall it needs to be supported, remove concrete and whatever is under, and dig a footing.

due to access on one side I'm hoping to use strongboys at around 800mm spacings off size 0 acrows.

I asked a builder mate of mine who said strongboys can move a bit if not a solid wall above.

but all the literature for strongboys says there fine for single storey walls.

anyone here had any experience of using them with single storey walls?

Can you tell is why that section is so wide? Is it an old fireplace? Or a cavity wall with a chunk of dot and dab etc? 
 

Props will only shift if they’re on something soft, and also if you’ve not used enough of them. 

3 hours ago, Nickfromwales said:

Can you tell is why that section is so wide? Is it an old fireplace? Or a cavity wall with a chunk of dot and dab etc? 
 

Props will only shift if they’re on something soft, and also if you’ve not used enough of them. 

Hi Nick,

which section to you mean?

that particular L shape wall has the kitchen on one side, and top half of the staircase after the 1/2 landing.

 

i've cleared the hardcore and dug done to hit clay. Can tamp that firm and place scaffold board under the prop.

47 minutes ago, vala said:

Hi Nick,

which section to you mean?

that particular L shape wall has the kitchen on one side, and top half of the staircase after the 1/2 landing.

 

i've cleared the hardcore and dug done to hit clay. Can tamp that firm and place scaffold board under the prop.

Just trying to work out if it's quicker, and easier, and a better job to prop the 1st floor up and just drop that wall so you can do the job properly?

That idea has been floated but the disruption to the f/f has muted it.

but 100% would have been the simplest solution.

17 hours ago, vala said:

That idea has been floated but the disruption to the f/f has muted it.

but 100% would have been the simplest solution.

If propping from the underside, there would (should) be zero disruption to upstairs life. Sounds like you need folk who make solutions instead of problems....