How to Build 100mm blocks onto 95mm blocks

[Spinny]

Concrete blocks are 95mm actual width, faced blocks are 100mm actual width.

So how do you position the 100mm faced block wall onto the 95mm footing ?

Edited September 23, 2025 by Spinny

[DannyT]

You keep the face of the 100mm flush with the block underneath and let the back overhang 5mm.

[Spinny]

And the acceptable tolerance from plumb on a 4m high wall which is 7m long ?

(I am seeing something suggesting +/-10mm over 2.5m height, and +/-10mm over a 5m length ?)

Would seem to suggest it would not be hard to be out by 15mm over such a wall ?

Edited September 23, 2025 by Spinny