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Threshold for needing expansion joints

I

i_am_fubar

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6x3m 100mm thick concrete slab with rebar mesh. Blockwork building on top.

I'm getting mixed results on whether I should add an expansion joint. What's y'all thoughts?

South Hampshire (UK), sheltered location.

Cheers,
Fubar
 
If you mean in the slab you shouldn't need expansion joints with rebar. Blockwork might but you would need further advice about that.
 
Question was for the slab. For the blockwork, I plan on putting in some expanded steel mesh every few courses to minimise cracking.
 

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