How To Lime Plaster Onto Laths

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How To Lime Plaster Onto Laths
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Lath and plaster is a building technique used
mainly for interior walls in period buildings. A
lath is a narrow strip of wood approximately 2
inches wide which is nailed horizontally to each
stud in the frame. Each lath is spaced
approximately 1/4inch ( thickness of the average
little finger ) away from the next leaving enough
space for the mortar to push through and hook
over the lath to form a key laths
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Preparation
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The LATHS must be free from dirt, grease and
vegetation. These elements should be removed
before damaged laths are repaired. Spray a clean
cold water mist on to the laths prior to applying
the scratch coat
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First Coat
Using a ratio of 1 part LIME PUTTY to 2 and a
half or 3 parts SHARP WASHED SAND with evenly
distributed HORSE HAIR throughout the mortar and
working to a layer of 10mm thick, push the
plaster into and across the pre wet laths at a 45
degree angle to the laths.The plaster should be
left until set hard but protected from heat and
draughts.
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The second coat also known as the intermediate or
float coat will be applied similar to the first
coat only without any hair being added to the
mortar. You must ensure you wet down the first
coat with a fine mist before spreading a 7mm
coat, before scratching up and leaving in
preparation of the finish coat.
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For the final top coat use a fine mix of 1 part
LIME PUTTY to 2 parts well graded super FINE
SAND. Remembering to wet down the surface before
application with a fine mist spray. Allow time
for the water to absorb into the plaster then
apply a coat of approximately 5mm. Rule off and
leave for a couple of hours. When ready rub up
the finish coat using a plastic or wooden trowel
to bring back the fat until the required finish
has been reached. In the case of any light
crazing this can be rubbed up and trowelled out.
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Health and Safety
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Lime mortar by its nature of application carries
a risk factor, and therefore personnel should
wear protective equipment, particular attention
to be given to eye and skin protection. EYEWASH
should always be on hand. GLOVES should be worn
when working with any mortars or plasters
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