Suspended concrete garage floor

[sam berry]

After being let down by several structural engineers wondering if anyone on here will be able to help me.

I purchased a new house 4 months ago and the garage is my next project. Water has been getting in for several years and it has rotted the existing suspended floor rendering it useless.

The current set up is steel beams with corrugated steel sheeting and a 3 inch concrete slab on top. the steel is resting on brick at each side and has a wall in the middle and a brick surround around the pit. The garage is 6mx5m and has a cut out for a pit. The front of the garage meets the road and is 7ft high, the back is 10ft high

My plan was to do a like for like replacement, but I have seen block and beam used in similar projects I am just worried about concrete block and beams strength to take a 2 tonne vehicle jacked on it.

Will block and beam be sufficient or will I be better placed looking into steel products.

Apologies if this is unclear but if anyone could help it would be greatly appreciated.

Kind Rgds

Sam

 

[JohnD]

rotted the existing suspended floor

Rotted? Do you mean it is wooden? Or you you mean the steel has rusted?

 

[sam berry]

Sorry two of the existing beams have rusted beyond repair.

 

[Tigercubrider]

Why is the floor suspended?
Most garages just have a slab

 

[sam berry]

Why is the floor suspended?
Most garages just have a slab

The whole house has been built on a hill so there is a basement under the house and the garage has a pit underneath and room for storage all around the pit

 

[Notch7]

Im not sure concrete beams would take the point load. -its a significant live load

Id be tempted to send a drawing to a concrete beam supplier and ask for a quote -they will prob tell you if it can be done or not. (Or somebody on here may know)

I suppose the concrete slab could have reinforcing in it -although I guess it would need to be 100mm thick as steel usually needs 50mm cover.

 

[sam berry]

Im not sure concrete beams would take the point load. -its a significant live load

Id be tempted to send a drawing to a concrete beam supplier and ask for a quote -they will prob tell you if it can be done or not. (Or somebody on here may know)

I suppose the concrete slab could have reinforcing in it -although I guess it would need to be 100mm thick as steel usually needs 50mm cover.

Thanks for the response. If I’ll require double the concrete it makes steel a more affordable option.

What size steel beams would you go with?

 

[Notch7]

What size steel beams would you go with?

Whats the span?

 

[^woody^]

You can't design a suspended garage floor from a few posts on DIYnot.

Get the block and beam floor manufacturer to design it, or get an SE to do it in RC. I can't understand how you could be "let down" by bone-fide firms of SEs.