Bolts for header/ledger

[arcon5]

Attaching a 4.8m 6x2 to the house wall.

Was gonna use 400mm spacings to coincide with the joists.

But what anchor bolts should I use and what size please?

Is m12 sufficient or do I need to go bigger?

Looking at these

https://www.ebay.co.uk/itm/GENUINE-...p2349624.m46890.l6249&mkrid=710-127635-2958-0

 

[catlad]

12mm is plenty if one in each joist/rafter.

 

[^woody^]

I would suspect that this ledger is not just going to be there on it's own. So the load on it vertical and horizontal may have something to do with what fixings are required.

 

[arcon5]

Sorry should have gave some context.
9 degree lean to flat roof so deadload is osb and rubber roof and obviously implied load from weather and elements (uk). Carrying 23 joists spanning 3m.

But gonna have 2x vertical 3x2 cls support beams doubling up as battens