Laying a new slab inside a building

[Wigeon]

I've got to lay a new slab inside an old brick building and would be mightily grateful for some tips!

I haven't done a whole shed before and done want to make any rookie errors...

I have broken out the existing concrete, and will have a decent base of crush.

Membrane first, lapped up the sides a bit I'm guessing. Question is then do I need foam surround along the walls? Shed is c6m by 19m. Walls currently just brick with rendered lower levels, but will probably have plasterboard and skim eventually.

The slab will probably have insulation and then self levelling screed on top as it needs to be a good finish.

Any tips gratefully received so I don't go cocking it up (it has been known....)

Many thanks

Wigeon

 

[MrA.G.]

First thing is to make sure that the sub base is as compact as possible by using either a vibrating plate or a vibrating roller. Your correct with the membrane. Foam strip would be preferable but not essential. That size of slab will need two cuts across it at third points to give 3no. 6 x 6.3 m sections. Single top layer of A252 mesh,50mm cover, 150mm deep concrete.
presumably it for a living space rather than industrial/ agri?

 

[vantage]

First thing is to make sure that the sub base is as compact as possible by using either a vibrating plate or a vibrating roller. Your correct with the membrane. Foam strip would be preferable but not essential. That size of slab will need two cuts across it at third points to give 3no. 6 x 6.3 m sections. Single top layer of A252 mesh,50mm cover, 150mm deep concrete.
presumably it for a living space rather than industrial/ agri?

Why the need for contraction joints and mesh? No mesh , form joints , mesh , no need?

 

[Wigeon]

First thing is to make sure that the sub base is as compact as possible by using either a vibrating plate or a vibrating roller. Your correct with the membrane. Foam strip would be preferable but not essential. That size of slab will need two cuts across it at third points to give 3no. 6 x 6.3 m sections. Single top layer of A252 mesh,50mm cover, 150mm deep concrete.
presumably it for a living space rather than industrial/ agri?

Many thanks! It'll be an office unit eventually, but will have nothing heavier than pedestrian traffic. Presumably no need for mesh then? Thanks

 

[MrA.G.]

Why the need for contraction joints and mesh? No mesh , form joints , mesh , no need?

I was unsure of the intended purpose. No real need for mesh in a domestic situation. I am used to dealing with more commercial and industrial projects where mesh would be standard. For a slab of this size I wouldn't bother messing about with formed joints.

 

[MrA.G.]

Many thanks! It'll be an office unit eventually, but will have nothing heavier than pedestrian traffic. Presumably no need for mesh then? Thanks

Agreed as long as the subbase is well compacted.