Unit 2046 - Brickwork Level 2 CAA Diploma ... - Pearson Schools

Unit 2046
How to carry out thin joint masonry and masonry cladding
164
Level 2 NVQ/SVQ Diploma Brickwork 3rd edition
Find out
Find out if there are any
variations to the ties
mentioned that are also
suited to the thin joint
system
Remember
On large sites, or in
instances where a large
number of cuts are required
for the job, a mechanical
hand saw or circular saw
may be used to cut blocks
Figure 5.8 Sledge
Movement joint ties
As the name suggests, these are
used to tie walls together where
the continuous length has been
broken up to allow for movement
joints. They allow for contraction Figure 5.6 Movement tie
and expansion between the two walls to avoid any damage to the
blockwork caused by movement.
Tools and equipment used for the thin joint system
Scoop
This is used to spread thin joint
mortar, producing a consistent joint
thickness of 2–3 mm. The scoop is
available in varying sizes of between
75 and 200 mm.
Figure 5.7 Scoops
Sledge
As with the scoop, this tool is also used to spread thin joint
mortar. However, the sledge is for use where the width of the
block exceeds 200 mm. This tool is available in sizes between 200
and 300 mm.
Masonry hand saw
This is used to cut Aircrete blocks to
the required size.
Block cutting square
This is used as a marking guide
when cutting blocks.
Figure 5.9 Masonry hand saw
Figure 5.10 Block cutting square
Sanding board
The sanding board is used to remove any imperfections in the
bed course. As the thin joint system requires a very accurate bed
thickness to be maintained, it is important that any raised areas in
the bed course are removed prior to applying the thin mortar joint.
Block rasp
The block rasp is used to trim any
areas of the block that are raised
and too big to be removed with a
sanding board. These raised areas
may occur when there has been
inaccurate cutting and will affect the
Figure 5.11 Sanding board accuracy of the thin joint thickness. Figure 5.12 Block rasp