Reinforced concete over timber joists. Safe?

[themoogs]

Hello

So my basement ceiling construction is a bit odd.

Timber joists, then stone, then reinforced concrete above!! Anyone ever seen something like this before?

The ceiling is quite low and I was hoping to raise the height of the joists. Do you think this would be possible.

I’m probably going to consult a builder after Xmas but thought I’d ask here first to get an idea if it’s possible.

 

[blup]

Its common in domestic first floor fire hearths, concrete slab on joists. Just a question of getting the calcs right and otherwise complying with building regs re fire safety.

 

[Dereekoo]

Perhaps stone slabs were sacrificial shuttering to concrete floor

 

[stuart45]

Hard to say if it's safe. A properly constructed suspended concrete floor will be sitting on load bearing walls at the perimeter. DIY could mean it's just got some mesh thrown into the middle.

 

[Dereekoo]

Hard to say if it's safe. A properly constructed suspended concrete floor will be sitting on load bearing walls at the perimeter. DIY could mean it's just got some mesh thrown into the middle.

Or the timber joists are designed for the dead load of the slabs/concrete and the concrete has nominal reinforcement to span between the joists.

 

[cdbe]

Certainly not conventional. I have an old terraced with a coal cellar under kitchen - the floor/ceiling is 3 huge stone flags approx 7 feet long x 4 feet wide. Above is some kind of leveling layer (maybe a screed). The pictures aren't particularly clear but if it started with stone flags, followed with either/or some leveling concrete on top/propping joists underneath it would make sense.

 

[noseall]

I've seen a 'concreted' first floor timber floor. It was boarded out then screeded. The building was very old.