Some of my block pavers have sunk...advice needed please

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Hi All,

Our block paved patio is suffering with a few partially sunken blocks. You hopefully can see from the photo what I mean.

The step has been formed from house bricks which over the years has eroded and let the sand holding the pavers to leak out. Again, hopefully you can see from the photo.

To make my life easier, could I remove the affected blocks, pour some sand / cement mix and reseat them rather than replace the house bricks, etc. which would be a much bigger job?

Any advice welcomed.

Cheers
Dazzy
 

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EddieM

Just lift the sunken blocks, put down some more bedding sand and tamp level. Shouldn't be too difficult.
 
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Thanks but the fact that it's sitting on house bricks which have started to crumble won't that just cause the sand to seep through again does bedding sand contain cement too?
 
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EddieM

Thanks but the fact that it's sitting on house bricks which have started to crumble won't that just cause the sand to seep through again does bedding sand contain cement too?

Oh so the blocks are on house bricks? If so, take up the sunken blocks, remove all the house brick rubble. Replace with MOT Type 1, compact the type 1, cover with suitable bedding sand, relay the blocks and tamp level.
 
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Thanks again for the reply. If you look at the pics you can see that the main patio steps down a little. The curved perimeter was formed from a single course of house bricks, some of which have crumbled (not completely but enough to allow the sand to wash out over time). Is bedding sand different to kiln dried sand which I use every couple of years between the blocks?
 
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Those house bricks should be properly cemented in place to stop anything from the block paving washing out. Are they loose? Anything you put under the blocks and try to compact will just move the bricks if they aren't secure. A bed of dry mix mortar under the sunken blocks might buy you a year or two but it will inevitably sink again if the bricks are failing.
 
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