Would 2 x 8" x 4" Steel beams / Rsj's be engough for a 6.5m garage roof ?

[Andy Parnham]

Hi, Just after some thoughts on Rsj sizes for a flat garage roof
Garage is new built single skin 6.5m x 6.5m and its got 2 pillars on the left wall and 2 pillars on the right wall evenly spaced out @ 1/3rd & 2/3rds of the way,
So will need 2 Rsj's to support 6"x2" joists (400 centers) with 18mm T&G OSB boards and Edpm on top
do you think 8"x4" beams would be sufficient ?

thanks in advance
Andy

 

[tony1851]

More than adequate, but would need some lateral restraint to the top flange.

 

[Andy Parnham]

Thanks tony, youll do for me
i had planned to weld some angle iron from beam to beam running along the wall and stick a few masonry bolts in for extra rigidity and another in the center of the beams
thanks again, much appreciated