A little more information from another post.
Without wishing to contradict any of above posts, may we make a couple of further suggestions.
Use STANDARD timber to timber 225mm long joist hangers in preference to jiffy. Couple of coppers more, but much better.
Nail every hole with sheradised 30x3.7 square twisted nails.
If you screw plate to wall before bolting, then use Through Bolts. Do not use raw bolts rag bolts, shield bolts, call them what you like, as these all need a bigger diameter hole in brickwork than your fixing hole in timber plate. Through bolts, the anchor is same size as bolt. Rattle drill straight through timber and brickwork in one hit, push bolt in and tighten.
oldun
Read more:
//www.diynot.com/forums/viewtopic.php?t=274906#ixzz1MnMbvVcW
Always use same size plate as joists.
If fall is from house to flank, use firrings, if from front to back or back to front, use reducing rips. As nose has said keep level ceiling.
600 centres
Depending on what decking you are useing
Would suggest 400 centres. Set your joists for 2400 sheets. Check you have sufficent storey height before roofing in.
oldun