Ledger board bolt spacing for lean to roof.

What is spacing for ledger board that spans 4.3m long and is beating on internal leaf block work?

The board is 7x2 the rafters will sit on top off the ledger board.

I was thinking 750mm centres staggered but starting at 200mm from bearing.

I'm using 140mm m12 through bolts.
Thanks

 

Anyone?

 

That’ll work. You can always add more later if you want. I just used screws to pin it up and build the roof and added the through bolts later on before the BCO came out

 

140 is a bit long it will end up in the cavity probably.

 

47mm board + 75mm wall = 122mm

18mm protruding for washer and nut.

Even if it were to go a little in cavity I've read there's no issues.

Cheers

 

What Is maximum spacing for bolts?

 

M10 @600c/c, staggered 1/3 depth but to miss any bed joint.

 

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