Amina BackboxSW345 V1.4 - Manual (Page 8)

Retrofit / pre-skimmed solid wall
Patch plaster finish
(alternative to feathered skim
)
Backbox alignment required for plastering
Use shims between the back of the
BackboxSW and the inside of the cavity to
align the front edge of the BackboxSW with
the front face of the base render. This should
be no more than 2mm (5/64”) behind the
finished plaster surface.
shims
For solid walls /ceilings that have already been
plastered and painted.
30-50mm
3/16 - 2”
sand down to
create taper
remove existing
plaster from
render
This method positions the speaker to be
patch plastered with a 2mm (5/64”) skim
across the speaker front and blended with
the existing plaster.
Amina recommend British Gypsum Easi-fill®
which allows a smooth accurate finish using
fine sandpaper or a wet sponge.
existing render
existing plaster skim
05