Laying concrete base for small shed

[roryfirth]

Hello.

I'm a complete novice when it comes to conrete work so would like some advice. I need to lay a concrete base for a 1.81m x 0.78m 'shed'.

I'm happy with building the frame to poor the concrete into but have no idea what if any base layer I should put in and how much ready mix concrete I need. Also if I need to mix anything in with the concrete? And how deep it all needs to be?

There won't we anything heavy in the shed

Any advice would be great!

Thanks
Rory

 

[merlin50]

why a concrete base

 

[roryfirth]

The gap has a slope and I cant use paving slabs to get a level surface, open to other suggestions

 

[r896neo]

the concrete should be 100mm thick and under it you should remove any soft areas and then lay 75mm of compacted MOT type 1

It's a bit overkill for a shed though.

 

[merlin50]

i use concrete blocks then wood bearers

 

[wrathkeg]

couldn't you dig out the soil so that it's level?

providing you have firmish soil, once the soil is roughly level you can then lay a dry mix of sharp sand and concrete in a ratio of about 6:1 and to a depth of 50-75 mm, level it off, lay the slabs (making sure they're level, obviously) with a gap of about 1 cm between them, fill the gaps with dry mix and job's done. moisture in the ground will make the dry mix go solid in a few days (I didn't believe this before I did it, but it's true). at least, this is how I did the base for my shed, which was quite a bit larger than yours and I haven't had any problems with it.

 

[wrathkeg]

of course, my reply assumes you are doing the base on soil, but now I have read your original post more carefully, maybe you aren't and are planning something to go on an existing hard surface of some kind.

 

[roryfirth]

Thank you all for your replies, I've now solved it using a frame and some paving slabs