C&G Working Materials

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Level 1 Diploma in Bricklaying
PowerPointpresentation
Working materials
Unit 103: Carrying out blocklaying activities

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Blocks
Internal skins on dwellings
are made from different
blocks. Lightweight blocks
are for insulation purposes
whereas dense blocks are
used for strength.

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Blocks
• Dense concrete blocks are the cheaper block and have a range of
uses.
• A concrete block is designed to be covered over or buried; it
provides strength, but has little design finish.
• Lightweight blocks are designed to be used internally, usually to
insulate a house or dwelling and trap the warm air within the
structure.
• Lightweight blocks are also usually covered over and a cladding put
over the top to provide a finished surface such as render or
plasterboard.

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Blocks
• Using blocks can be very dangerous.
• The size, weight and makeup of the block can lead to accidents.
• Block manufacturers will deliver blocks to the site in a safe manner;
the blocks are placed on pallets and wrapped in sealant or straps,
making them easier to move and be stacked.
• The blocks are stacked no more than two stacks or pallets high to
facilitate pick up and transportation by onsite machinery.

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Blocks
• Site personnel can also access and load
the materials into wheel barrows.
• The movement of blocks must be kept
down to a minimum to stop double
handling.
• The delivery of the materials is very
important in relation to positioning; the
site compound or storage area needs to
be close to the designated work area and
front entrance.

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Spray paint
Spray paint comes in
tins as shown opposite.
The spray paint is used
to transfer the ranging
line position to the
ground or concrete.

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Building sand
Building sand can also mark the
ground to show the positions of
the face lines.

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Table of uses
Dense block A strong load bearing block
Building sand
Used to lay all bricks and
blocks
Spray paint
Used to mark lines to the
ground
Concrete
Used to infill between skins
to provide strength

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Concrete
Concrete is used between the
two skins of a cavity wall to add
strength. This concrete is called
fine fill. It is made from a low-
strength concrete and stops the
two skins pushing together when
the back fill is applied.

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Cement
Cement comes in
25kg bags. Look for
the yellow bag – it has
plasticiser mixed in.

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Plasticiser
Plasticizer is added to
the the water to trap air
in the mix, making the
mortar mix more
workable.

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Any questions?