Suspended floor/timber frame garden room

[23vc]

If I want a suspended timber floor on a garden room which will have a couple of courses of single skin brick walls above ground then timber frame, what’s the best way of hanging the floor joists, can I use built in masonry hangers or will they not work because there’ll be a timber sole plate directly above them? Any tips on how this is normally done?
I want the top of the joists level-ish with the top of the masonry.

 

[noseall]

Jiffy's hung down off the the sole plate?

 

[23vc]

Ah yes, failed to think of that

reckon I need air bricks to vent the void, or is that overkill for a cabin?

 

[noseall]

Ah yes, failed to think of that

reckon I need air bricks to vent the void, or is that overkill for a cabin?

Vent it, yes.