Floor to support 4 tonnes

[joeb99]

Hi,

I need to design a floor that can take 4-5 tonnes. The floor is in an extention that will be build.
Currently, there are soil pipes running about a foot under the garden, i dont want to move the pipes as they are old clay pipes, shared with other houses in the street (common sewer runs through all the houses in the row) as far as i can tell.

There is no man hole in the garden, nor in both next door neighbours, ive checked up to 3 houses in both directions, and know one has a man hole!

So, i guess a wooden floor will be required, or concrete with shuttering around the pipes, so just over the pipe is wood maybe?

Im not really sure what to do here. Will a wooden joist floor be able to take 4 tonnes?

 

[freddiemercurystwin]

You've no choice but to talk to a structural engineer when your talking about loads like that, whats going in there? a tractor? Have a word with building control, you don't have to give your details, ask them to recommend a decent cheapish one man band type fella. You'd be very brave/naive to take advice off a forum when you're dealing with large point loads like that.

 

[joeb99]

a spa is going in there, full of water, 4cu. m is 4tonnes.

OK i'll call them in the morning.

 

[markie]

10x10" joists might just do it lol

 

[mattysupra]

Concrete base. approx 6" thick will do it. Your not point loading 4 tonne in one spot but across large area. If you think of a garage floor at 6 " thick will hold a 2 tonne car easy. And all this weight point loads through the wheels which move over it to. My spa sits on a 4" base as recommended by spa people. But mine is out side so if did move not really a problem for me.

 

[Static]

As said a slab will do it (say 150mm thick), you should really encase the pipes in concrete to protect them.