Our house has about 2 metres clearance underneath and I am going to build a little lock up under there to put my powertools and other valuables.

Now I plan to use H3 treated timber and I do not intend on having the timber directly touching the slab anywhere (it is an old slab full of cracks and joins).

My problem is the wall which will have a door way on it. As you can see in the attached picture. I plan to use a Steel U-Bracket (I think this is what they are called, basically you dynabolt them into the slab then you screw your timber into them) for the corner of the wall where the door way will be. However as you can see in the picture. At the top of the wall I have nothing securing it to the joists (and as such it will most likely wobble).

What should I do here? I was thinking considering I'm using the U-Bracket on the base if Termites were to get into the wall I would see their mud tunnels on the u-bracket so it'd be safe for me to just directly join the stud to the joist beam above it which would make it stable.

Any better ideas?
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