block pier and concrete floor slab

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Q1 I have on the drawing a 7n block pier between 2 bifold doors, the width is 440mm should i half a block and alternate courses to both inner and outer leaf or will stacking them on top be stronger.

Q2 when pouring the base slab is it better to pour rght up to outer skin below the door thresholds or maintain the 100mm cavity.

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You don't need to bond a one block pier. But its a very slender pier if its only one block thick, has it been designed and deemed adequate?

The slab should be independent unless its designed to be supported and reinforced
 
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yes its been designed at a min of 300mm pier, the reasoning for the floor slab is i have saw clips on youtube of installation of bifolds and they all seem to be directly on to floor slab rather than inner brick leaf
 
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Blocks should always be laid upright; stacking them flat reduces the compressive strength by approx 50%.

440mm seems a rather narrow pier between two sets of bifolds?
 

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