Floor slab

mrbad

Having a small job done at home.
The 804 lean was put down, dpc, 100 insulation, and then the floor slab. It is 70mm. Does 70mmsound ok for the concrete floor slab?The guys doing the build are really professional and I am sure it's correct.its just I saw on another website 150mm mentioned. It's a very small utility room, 130sq foot .

sydthebeat

70mm unreinforced on 100 insulation wouldnt be acceptable to me.

mrbad

sydthebeat wrote: »

70mm unreinforced on 100 insulation wouldnt be acceptable to me.

Is it legal? They put mesh in with it I think too.
I was just reading thru other sites. Other people use it. Also, the architect will sign off on it.
It's a one story ,fancy lean too.
I know it's not acceptable to you, but can u help me in why others might think its fine?

BryanF

mrbad wrote: »

Is it legal? They put mesh in with it I think too.
I was just reading thru other sites. Other people use it. Also, the architect will sign off on it.
It's a one story ,fancy lean too.
I know it's not acceptable to you, but can u help me in why others might think its fine?

slab: the Eng should sign it off

con1982

I've never allowed a residential floor slab of less than 100mm. I've seen unreinforced 60-100mm floors in older homes, so they can work but don't offer much in terms of spanning soft ground or differential settlement. Not sure how a thin slab would cope with impacts (dropping heavy furniture or tools).

Why does the slab have to be so thin? The cost difference for a 100-125 slab would be minimal.

kkelliher

mrbad wrote: »

Having a small job done at home.
The 804 lean was put down, dpc, 100 insulation, and then the floor slab. It is 70mm. Does 70mmsound ok for the concrete floor slab?The guys doing the build are really professional and I am sure it's correct.its just I saw on another website 150mm mentioned. It's a very small utility room, 130sq foot .

Not acceptable by any standard, that thickness is only suitable for a screed. Any small settlement movement in your stone or insulation and i would be suprised if your floor does not crack

mrbad

dont know why so thin.maybe there is special concrete? re enforced? or maybe he is going to pour second amount?

sydthebeat

mrbad wrote: »

dont know why so thin.maybe there is special concrete? re enforced? or maybe he is going to pour second amount?

1. No
2. Should be anyway
3. Wouldn't fix the issue

Perhaps you should ask him?

mrbad

ok sydthebeat. i c what your saying.so adding on extra wont help? ie does it have to b poured in one go?
i dont mean to offend, but do u have much expierence?
i dont.

rickmoister

hi MRBAD I agree with the rest of them nothing less than 100mm for a floor slab putting a floor screed on top will make no difference because they will not bond to each enough to improve the strength. I have 20 years experience in construction .

mrbad

tnx guys.dont mean to b rude asking.just was wondering if i was talking to another person like me with no expierence!
wil contact architect tomoroto c what he says.