I wish to replace the wooden joists (which are rotted anyway) supporting the
attic room above our kitchen to give slightly more headroom. I assume steel
joists are the strongest sunstitute. Does anybody know what the equivalence
measures are between steel and C16 wood are ? Current wood joists are
125mm by 47mm on 300mm pitch and even saving an inch or two would make the
place seem less claustrophobic.
If you're going to the trouble of removing all the old timbers, then why not
have the walls built up and place new timbers on the top like the existing
construction is now. You could probably build up another two brick course
and give yourself plenty headroom and still be within regulations if done
Just a thought.
Ah right ! So you'd need to work out how many lengths of the narrower steel
joists you'll need to make up the gaps that the flooring boards can sit on
without breaking. So if there are 5 wooden joists spaced at 450mm gaps,
then you'll need the same amount of steel at the same spacing.
I don't know if I understand this
Do you mean you want to replace every floor joist with a steel beam?
What is a 300mm pitch in relation to a horizontal floor joist?
And c16 wood?
Have you considered how you will fix a floor and cieling to a steel beam?
And what of the inevietable cold bridge from the end of the beams where they
are built into the wall, and the potential for staining where the cold steel
beams are in contact with the ceiling below?
How about an alternative strategy. Suppose you were to put a single steel
beam at right angles to the existing joists across the middle of the room.
Suppose you were then to use half-length wooden joists running from the beam
to each side wall. [You would have to fabricate some suitable hanging
arrangement in order to support the joists in line with the beam - but it's
You should certainly be able to reduce the joists from 5x2 to 4x2 (Imperial
sizes) if they are only half as long as the originals. You may need to take
advice on whether a 4" I-beam is sufficient in the other direction. How long
are the spans?
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