On Fri, 25 Sep 2009 16:11:03 +0100, Tim W wrote:
perhaps 2x2" square washers (about 1/16" thick) -
banged in between the wood and the beam until tight (use as many as needed
under each bit). Easy to buy and fairly flexible to make up the thickness
required.

The only thing to be aware of is that the packing *might* "walk" due to
expansion and contraction over time...

Might be possible to weld in place after, I suppose, so long as it was
done quickly enough to avoid too much localised heating of the joists.

Around here in the land o' timber-framed houses, it's common to use wooden
shims for levelling floors - but they're usually nailed in place
afterwards to the supporting beam, and that doesn't work if it's steel :-)

cheers

Jules