Wonky Concrete Shed Base

[tozerman]

At the end of my garage I have a concrete base with a brick/block built lean to/shed, as below.



The person/bodger (not me) who laid the concrete slab did not tie it to the garage base, it was just laid next to it. Over the years the slab has slowly been "leaning" away from the end wall of the garage, as below.

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I am going to demolish this lean to/shed and put a new freestanding shed on the base. My question is How would I stop the shed base leaning any more than it is now ?
What would be the best way to level the base before I put a new shed on it ?

[Simpo Two]

How about hoping that it's finished subsiding and adding a fresh layer of concrete to give it level surface?

[PhilboSE]

Think I’d just hope it finished subsiding and use packers under the shed bearers to level it out. If it goes out of true later on, jack up shed and add more packers…

[KTMsm]

No one would tie a shed base to a house

As above place a treated batten or plastic packer to roughly level it - it's a shed, it doesn't matter

[OutInTheShed]

It's not wonky, it's a strategic draining slope!

[Macneil]

I had a really wonky slab base and the lads who put my shed up used a subframe and levelled it with shims before putting the shed on it, did a great job.

But if you really want it right, you know you've got to dig it up and lay a new one don't you?

[RC1807]

OutInTheShed said:

It's not wonky, it's a strategic draining slope!

Name checks out…..

[Mad Maximus]

Plastic window shims is what I used. If you end up needing loads work out what you want where flip over whatever you are using as a base and screw through them into the base and bobs your donkey.

[Murph7355]

Depends how far out it is. You can buy adjustable feet for shed frames which allow for levelling out.

[mikebradford]

Depends if your using the concrete as your floor, or the usual rubbish timber floor that comes with the shed.

I'd simply cut some tanalised timber on a chamfer to match the slope of the concrete, then set the shed on that so it's level. Have the concrete as my actual floor.
Accept my floors wonky.
If it moves some more over time I'd not worry unless it managed to fully flip over

[tozerman]

Thanks for everyone's help, much appreciated.
I'm going to simply install new shed and if it looks too wonky then I think shims will be my best bet here.
Thanks again all.