First time laying blocks

24 Dec 2015
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United Kingdom

I'm building a small wall (two blocks high) in the garden. The foundations, despite being pegged out with a spirit level, are not quite level.

I started laying concrete blocks today, but as I go along in order to keep them level the mortar underneath is getting a little thinner.

Is there a minimum thickness of mortar that I should aim for underneat the blocks? It's not a huge issue if the first row of blocks is slightly uneven, and I use the second layer of mortar to even it out: the wall will be completely covered when it's done.


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10mm is the standard, but it won't be an issue if you make the mortar bed a bit shallower or a bit deeper (at the other end). Or have a bit of unevenness as you mention - assuming by 'covered' you mean rendered.

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