6708 13 l1_121_presentation_2

Level 1 Diploma in Plastering

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

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Preparation of backgrounds

Unit 121: Prepare background surfaces and mix

plastering materials



Assessment criteria

1.2 state the methods for removing existing plaster by hand and machine

1.3 state the methods for cleaning down background surfaces

1.7 describe the importance of cleaning and waste disposal

2.1 use instructions for preparation of background surfaces

2.3 select hand and power tools to prepare background surfaces

2.6 clean work area and dispose of waste

2.7 use correct access equipment

2.8 follow current environmental and current health and safety regulations



Before stripping any plaster off walls, correct PPE must be

worn. This includes:

All the above are essential when stripping plaster.

PPE



Stripping of plaster materials – commonly

known as hacking off on old walls – can

either be an easy or hard task, depending

on factors such as age, whether the

building has been left for a long time

without being watertight, etc.

Stripping plaster



Lump hammer

Big heavy hand-held hammer;

can be used to hit the wall

plaster to loosen it or in

conjunction with the tool below.

Bolster chisel

Hit by lump hammer to strip

plaster; also used by bricklayers

to cut brick blocks.

Tools and equipment



Claw hammer

The claw is used to extract

bent nails or old nails on pre-

used timber.

Pick hammer

This hammer is a good tool

for getting in between thin,

tight surfaces, like brick and

stone, to rake out the joints.

Tools and equipment



Skutch hammer

A toothed hammer which can

be used to create a key.

Tools and equipment



Electric stripping tool

This is a 110V stripping gun

and the photo at the bottom

right shows the bolster

attachment used to strip

plaster, sand and cement.

You must be suitably trained

in order to use this equipment.

Tools and equipment

www.youtube.com/watch?v=KroAfHVx4zo



Lath hammer

Old traditional tool used

by plasterers, before

plasterboard was widely

used, to cut odd wooden

laths when lathing.

Excellent for hacking off

old sand lime plaster from

walls.

Tools and equipment



Wire brush

Once you have stripped off the

old plaster on solid walls, all the

loose particles need removing.

You do this by using a wire

brush; this can be speeded up

by using a wire brush

attachment on a 110V drill.

Tools and equipment



Industrial vacuum

Especially made to vacuum up dust on a building

site, these are made in 110V for safety.

Mechanical extraction systems

Used to extract dust particles out of the air.

Tools and equipment



If the walls hacked off have had a damp

course treatment, they will still require a salt

neutraliser treatment on the brickwork prior to

plastering.

This stops any salts called efflorescence

working their way to the face of the newly

plastered wall.

Treating damp walls

www.dampshield.com.au/plastering.html



When working in occupied houses or

properties, always remember to protect any

carpets and furniture by using dust sheets

– not only in the room where you are

working but also in any stairs, hallways, etc

you may be walking through.

Protecting the area

http://www.youtube.com/watch?v=HnoKVFvfXoE




Disposal of waste

After hacking off any gypsum waste, you

must disposed of it responsibly.

It is now an offence to dispose of gypsum

waste in a landfill site.

www.environment-

agency.gov.uk/static/documents/Business/PS_007_Landfilling_gypsum_rev_Jan_2011.pdf





Any questions?

6708 13 l1_121_presentation_2

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