New roof joists on brick shed

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Hi,

I have a brick built shed. It is a single brick wall and currently has a metal roof on. It is approx 3.5 x 2.5m. I want to swap the metal roof for a green roof. I will need to add more roof support for this; Can I use wall hangers off the brick walls for this, or am I better off cutting holes in the bricks and resting the joists directly in these, as the current ones are?

Thanks!
 
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You would struggle to use hangers at the top of the wall because there's little weight above.
 
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Ok, great. One other question; the joists are running perpendicular to the fall of the roof. With the metal roof this is achieved by a change in the height of the joists across the roof. If I want to change to timber I guess I will want more contact with the joists so this might not work? If they were running parallel to the drop I know I could use firings; what is the normal practice with perpendicular joists?
 

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