Foundations lower on one side

[Artrax]

Hi all, happy Easter!

I am embarking on a sort of self-build extension. I've dug the footings and had them filled with concrete but the surface isn't quite level - one corner is about 90mm lower than the other.

My builder had suggested I put some shuttering around and fill with more concrete to level it out.

Is this going to be ok? Is there anything further I should do to strengthen it or bond it to the existing concrete?

Thank you

 

[Charlie George]

Hi all, happy Easter!

I am embarking on a sort of self-build extension. I've dug the footings and had them filled with concrete but the surface isn't quite level - one corner is about 90mm lower than the other.

My builder had suggested I put some shuttering around and fill with more concrete to level it out.

Is this going to be ok? Is there anything further I should do to strengthen it or bond it to the existing concrete?

Thank you

Shuttering, are your foundations above ground level?

 

[Artrax]

Shuttering, are your foundations above ground level?

No, but the inside footprint is level (more or less) with the top of the foundation ready for the sub base and slab.

 

[DAZB]

You could drill holes to the poured footings and set in some short lengths of rebar using resin fixings which will help bond the top up pour to the rest of it. Make sure you allow enough cover over the rebar for a decent thickness of concrete.

 

[George_engineer]

Think I'd just make up the level in brickwork rather than having thin layers of concrete.

 

[noseall]

Hi all, happy Easter!

I am embarking on a sort of self-build extension. I've dug the footings and had them filled with concrete but the surface isn't quite level - one corner is about 90mm lower than the other.

My builder had suggested I put some shuttering around and fill with more concrete to level it out.

Is this going to be ok? Is there anything further I should do to strengthen it or bond it to the existing concrete?

Thank you

I'd be more inclined to deal with the discrepancy with masonry.

90mm!

 

[Murdochcat]

Have you asked your BCO ?

 

[Artrax]

Have you asked your BCO ?

I haven't spoken to the bco about this yet, no. Do you think it's something they would advise on?

It's over a span of 8m so it's not really that noticeable until you actually get a level on it.

I wondered why not masonry but I'm just going on the suggestion of the builder.

Thanks for all your advice so far.

 

[noseall]

Have you asked your BCO ?

For what?

 

[noseall]

I haven't spoken to the bco about this yet, no. Do you think it's something they would advise on?

NO!

 

[noseall]

It's over a span of 8m so it's not really that noticeable until you actually get a level on it.

90mm over 8m is horrendous. If I was your builder I'd be fuming.

How did you actually determine a finished height for the concrete?

 

[^woody^]

My builder had suggested I put some shuttering around and fill with more concrete to level it out.

He's not a builder.

He should sort out and mark the DPC level and guage down from that at each corner.

He should then work out the size step required and where it should go.

Do not tell the inspector.

 

[Murdochcat]

I haven't spoken to the bco about this yet, no. Do you think it's something they would advise on?

BCO normally like to inspect before the footings are poured around here

 

[Notch7]

sounds like a pig in the brickwork coming.....



trying to add to the foundation just adds a weakness in my opinion -its ok at 90 mm but what happens when you get below 30mm, the aggregate will be bigger than the the thickness.


from about 9 minutes in -a good explanation of how to deal with it

 

[noseall]

BCO normally like to inspect before the footings are poured around here

You obviously haven't been following this thread properly. The conc' is in and set solid.