Rafter to ledger board connection.

[John2000]

Hello 

I want to fix my rafters to a ledger board. I’ve made a small bird mouth cut to seat the rafter onto ledger. This has the full 47mm bearing. Trouble is I’m looking at code complaint way to fix these without nailing or screwing too close to the limits. This is the diameter of the fixings within the distances of the end grain, edges, birds mouth angle etc. due to the rafter sitting high on the ledger I haven’t got an option to skew nail through the plumb (heel) cut. If I go in through the sides and down into the ledger  I’ll be too close to the birdmouth angle. I was thinking either pre-drill and go in with a long screw from the top. 5mm directly down so it lands 25mm in the centre of the seat and into the ledger. Or use some kind of twisted restraint bar along the side of the rafter and twist to then hit the ledger. 

 

The downward thrust is taken care of by the wood to wood seat. It’s just uplift and connection. I’m assuming horizontal twist - although I can noggin in between to stop this twist and slide. 

 

Anyone with any firm knowledge on this situation please help. 

 

(Also - please don’t reply if you’re just going to say plumb cut with a hanger, etc) it needs the bird mouth for BCO.)

 

Many thanks. Picture below. 
 

 

[Mr Punter]

Truss clips to prevent uplift, noggins to prevent twisting.