Last time I bought steel of roughly that size it cost me about £100. It'll be heavy, so you'll need to think carefully about lifting it - a chain block at the very least.

You ain't going to get that for a onner either.

What is it for?

It's a very strange size. Which country are you in?

At that weight it would make a good wrecking/demolition ball if not handled with care.

Heartbreaking too.

As Roger suggests it shouldn't be too difficult to get some prices. Local engineering firms will usually have experience of undertaking steelwork and are set up to make cuts, weld on plates and drillings. They can also sort out any galvanising that might be needed (probably not required here...).
As to lifting it into position don't take any risks. It should be possible to hire something like this

http://www.brandontoolhire.co.uk/lifting-hire/prodview.asp?idproduct=33

or this

http://www.brandontoolhire.co.uk/lifting-hire/prodview.asp?idproduct=32

They can be used singly or in pairs and you should be able to get them delivered if needed.

CommentAuthorbiffvernon CommentTime2 days ago quote
Use a bit of wood instead. Greener.

what size bit of wood would I need to support a wooden floor 12ft x 14 ft and is wood cheaper than steel these days?

Posted By: mike548what size bit of wood would I need to support a wooden floor 12ft x 14 ft and is wood cheaper than steel these days?

At least 14ft long. Fortunately wood grows on trees that are quite tall so you don't need to bother with bolting 2 beams together to make the length, as bot de paille suggested. If it's too long you can cut it to size with a saw and use the leftover bit for heating or turn it into a lamp standard, book end, etc. None of this is so easy with steel.

Finding out the cost of steel is the easy bit: ring any steel stockholder. The difficult and potentially expensive bit is getting such a monster in position - could well require a mobile crane etc, tho I have installed similar items 40 ft up with chain blocks. But the real question is why such a monster is reqd. The simple way to reduce cost is to reduce the span by providing a mid-supprt like a wall or pillar and thus two beams each much smaller sections. Another solution is to crate a truss-like support system, portal frame or a lattice type girder. Coulds be even DIY with cunning design.

Without knowing the background however it is impossible to advise.

Yes

it's a kitchen ceiling , above is a bedroom.

Hi,

Steel beams for example come in weight grades or classes so a 25 grade is 25 kg per meter length, a heavier beam might be a 46 which is 46 kg per meter and so forth. So for the various shapes they will all have this on them although obviously they are different cross sections.
Thus a surveyor will simply tot up the linear lengths and times by each weight grade to get the overall weight.
Not sure of up-to-date prices but less than £1000 a ton is good, greater well no so good.

Hope this helps a bit

Mike up North

how about something fresh from the wood dressed up a shade with a chainsaw ie squared up a bit. I might have an Ash would do the trick. Need two though.Very rustic but still...

I have just put a new floor joist across my 4.2m wide barn, I used 9" X 2", C16 timber, interestingly NO deflection worth measuring with my 180lb weight hanging from it ( less then the thickness of a pencil line). I was comparing it with a 10" X 4" X 17' purlin I had removed from another building, - the purlin deflected by about 3mm, at 4.2 m apart supports. Thats why I bought the new wood. Just got to replace the other 13 joists now
Can you not "hang" this beam from a structure in the loft? A trivial sized piece of steel can be used, like a piece of 1/4" rod to take a ton or so.
Frank

with no intermediate support?

8m = twenty six feet in old money.