In an earlier contribution to this discussion, Andrew May
wrote:
I need to extend an internal wall but only by about four inches. It
sticks out into a kitchen and needs to be a bit longer to reduce the
doorway gap. It is built from some form of concrete block, more a
cinder block than thermalite and the end of each alternate row is a
single upended brick. The finished wall will be plastered. As far as
I can see there are several alternatives.

1 – Cement an additional column of upended bricks to the end.

2 – Chip out the upright bricks and cement in bits of thermalite block
so it continues to be interlocking.

3 – Screw a piece of timber to the end with spacer pieces to ensure it
is in the right position. Infill with brick/cement. Then put gauze
over the new section before plastering.

4 – As 3 but hack off all the plaster and plasterboard in one go.

What does the team think would provide the best solution.

Andrew

There's little doubt in my mind that (2) is the best solution. (1) is
unlikely to work because you won't get good bonding, and the new bit will
crack away. I suppose that (3) *might* work. (4) sounds like a hell of a lot
of work, and it's not that easy to remove plaster in a way which leaves a
flat surface.

The *easiest* solution would be just to add a solid bit of timber of the
right size and clad it with plasterboard, and skim it to blend in with the
original plaster. The only problem with that is that - over time - you'll
get hairine cracks between the old and new bits.
--
Cheers,
Roger
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