Technical Advice Note for Bag Rub Finish

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Technical Advice Note For Bag Rub Finish
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Bag rubbing is a technique where the pointing of
masonry is conducted in a manner closer to
rendering, that does not (have to) extinguish the
character of the wall.
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Preparation
The joints to the masonry are prepared the same
as for pointing, cleaned out to an average depth
of 25mm to form a key. This depth will vary
according to the nature of the stonework, but
should not be less than 20 mm.
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The joints are then thoroughly cleaned and washed
out by use of a hose (fine spray nozzle only) or
suitable pump up sprayer. This is preferably done
the day before application, and again immediately
before application with a fine mist spray. A
single coat (following any preparation required
for deeper pockets) of lime mortar is then
applied fully into the joints.
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The mortar should be mixed using a blend of 50/50
standard coarse and fine sand, mixed at the ratio
of 25 hydraulic / non hydraulic lime to sand.
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Bag Rubbing
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Once the mortar has cured sufficiently it should
then be rubbed up using hessian sacking or some
other type of suitable material in order to press
it home. Then after the initial set has taken
place it is rubbed over again. The rubbing action
should be carried out in such a manner as to
press it well back into the recessed joint
closing up any initial shrinkage that has taken
place. At this point it is often scoured up with
a sponge or suitable medium to achieve the
desired finish.
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Material consumption will be in the region of
approximately 50 square metres per tonne of
mortar (for guidance only). This will obviously
vary depending on how and what the wall has been
built from and its overall condition.
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