Ashlar detailing provides an
aesthetically
pleasing effect
within the render finish
and is
achieved by cutting recessed
joints
into the “green render”
using simple
tooling. The
effects can be quite stunning
but good execution by the
applicator is
paramount and
Parex will offer training
and
advice when this is required.
There are some basic rules
with regard
to Ashlar cutting
that should be
observed. These
are regarded as good
building
practice and are detailed below.
- Total render thickness
in one pass
should not
exceed 25 mm.
- Minimum thickness with
regard to
exposure - In most
conditions the
Ashlar cut will vary between 5 and 10
mm. Minimum depth of render at
lowest point should be 15 mm.
- Severe exposure - Minimum depth of
render at lowest point should be
20 mm.
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RECOMMENDED DO’S AND DON’TS
Avoid cuts directly below string courses
as they may indicate defects in the
construction line.
Avoid placing cuts in line with
transoms, heads and cills. If windows
are out of line, the cuts will highlight
the inaccuracies of the building line and
will create lines which are not parallel.
Guidance notes:
- Always use setting out lines. Note: If
a chalk line is used ensure the chalk
mark is cut away as it is difficult to remove from the render finish.
- Do not use beads to form the Ashlar effect.
- Only return the Ashlar effect into the reveal if there is sufficient render thickness of 20 mm minimum.
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