How much overlap for joining 6x2 roof joist over steel beam

[Andy Parnham]

Hi all, so im doing my flat garage roof and need to join the joists over the steel beam and just trying to find out how much overlap you need, is a total 600mm join ok ?
so 300mm eitherway from where the arrow is on the picture

Also can they be screwed together or do they need to be bolted with coach bolts and star washers etc for building regs

many thanks in advance
Andy

 

[^woody^]

Just the bearing is enough. 100mm?

There should be full-depth noggins between them at the bearing, the joists dont need any fixing together.