Quote:
Originally Posted by Danny
If it's spanning 6.8m and there is an I beam in the middle then whatever members you use will be spanning 3.4m only.
For storage only you won't need hugely rated members unless you're storing really heavy stuff or wanting to live up there, then (without my tables handy so check before you undertake the job) I'd imagine 190x45 or 240x45 F17 LVL at 450 centres supported by the I beam in the middle and a waling plate on the garage walls set with Hilti Chemset or Dyna Bolts. Normal chipboard yellow tongue flooring on the top and a ladder to access and you're set.
It all depends on the position and the rating of the I beam of course. If it's not a strong beam then it may not be worth putting extra dead load on it. If it is up at the peak of the roof then you can't really hang much off of it, and then your timber would be spanning 6.8m in which case you'd be looking at steel as a most economical mode to span such a distance.
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The I beam is massive, it spans the Garage lengthways (if that makes sense) and is somewhere 8~9m long. So I can't imagine my few boxes of stuff are going to be a big issue. Couple of Girder Brackets and suitable rods...
My reading of the tables (floor/deck) is that with MGP10, 190*45 (35) should be enough to span 3.5m?