Which joist hanger & span help

[jbuk]

I have been laying new joists in my attic, they're 195 by 75mm x 4.3m finished size

around the bay window I need to have a trimmer joist that spans around 2.5m then hang the ends of about 5 joists from it, the trimmer joist will be hung about 100mm from the ends of the joists supporting it

First of all will it be ok to use a piece of the 75x195 for the 2.5m trimmer joist? will this be adequate to support the ends of 5 other joists?

Will the 2 joists supporting the trimmer be adequate seeing as i'll only be hanging the trimmer 100mm from their ends?

finally what type of hanger do I use? a brickie friend mentioned something about a timber to timber hanger that is nailed vertically to the trimmer and has a bit that wraps over the top of the joist , I cannot find any of this type, they all seem to be for masonry to timber

 

[SDMCF]

I have an old book that says the rule of thumb for arriving at the extra dimensions required in the trimming joist [the two joists supporting the trimmer] is to add 1/8 inch in breadth to the size of the common joist for every trimmed joist supported by the trimmer. So you should use 195 x 90 (or wider I suppose). I would also make the trimmer this size.
Caveat: I am no expert so I am just quoting from a book, and anyway ideas can have changed since my antique reference was published.

 

[Static]

I think a sketch of what you are talking about would help.. i've no clue..

 

[jbuk]

Hi thanks for the replies

I'm going to double up the joists supporting the trimmer by coach bolting and glueing them together, I will also double up the trimmer joist , I think this will be more than adequate and won't add too much more cost to the job.

 

[DAZB]

 

[DAZB]

Doubling up the supporting joists is the recognised and recommended method and in fact i think Building Regs insist on it in most cases if not all.