End joists on side walls?

[Joe87]

Me again with another random/ dumb question ??

 

I'm close to getting started on the warm flat roof. Been a little bit on account of trying to figure in a steel lintel and corner window...oh and the British "summer".  

 

I've watched a load of YouTube and read plenty but realised that I don't actually know where the final side joists go? Do they sit on the inside/outside of the block wall or just on the inside of the wall. Also does the side wall need a wall plate put on it? 

 

I was planning on putting the final side joists on the outside of the block wall and insulating inside against it. 

 

Hope that makes sense.

 

Thanks all... Again. I appreciate all the help

 

[nod]

You don’t need a wall plate for and they will sit directly on the inner leaf of the block work You don’t want any of the joist lapping into the cavity