Working Materials

© 2013 City and Guilds of London Institute. All rights reserved. 1 of 12

Level 1 Diploma in Bricklaying

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Working materials

Unit 103: Carrying out blocklaying activities



Blocks

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



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.



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.



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.



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.



Building sand

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



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



ConcreteConcrete 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.



Cement

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



Plasticiser

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



Any questions?

Date post:	15-Apr-2017
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Working Materials

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