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Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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PowerPoint presentation
Measure, cut and fix plasterboards
Unit 123: Fixing sheet materials
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Assessment criteria
1.1 state how to use specifications and schedules to fix plasterboards
1.2 state the importance of accurate measurements
1.3 identify different types of fixings used for plasterboards
1.4 state the reasons for staggering joints when fixing plasterboards
2.3 fix sheet materials in place
2.4 apply safe working procedures for cutting and fixing plasterboards
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Cutting plasterboards
1. Mark out timber studs
on the floor and
ceiling.
2. This will help locate
the studs once the
boards are in place.
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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1. Gyproc boards must be fixed with the printing facing the studs.
2. Each board has two bound and two unbound edges. The bound edge must span the studs.
Cutting plasterboards: rules to remember
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Cutting plasterboards … continued
• Prepare a cutting area.
• Measure the length
required (remember to
measure to the centre of
the stud).
When measuring
plasterboards, it is
essential that correct
measurements are taken.
This will reduce the
amount of wastage.
Waste = loss of profits!
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Cutting plasterboards … continued
1. Lay the board down flat
with printing facing
downwards.
2. Mark off the
measurements required
on the face of the board
and place a straight
edge up to these marks.
3. Using the board knife,
score the board two or
three times along the
straight edge.
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Cutting plasterboards … continued
4. Now turn the board right over so that the printing is facing upwards. Whilst holding the board up slightly, with one hand tap along the reverse of the cut and snap the core.
5. With the core of the board now broken, the paper lining needs to be cut to separate the two pieces.
• Any rough edges can be
smoothed with a surform.
• Care should be taken not to
tear the paper from the face of
the board, as this will cause a
defect.
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Cutting plasterboards … continued
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Waste
• Most building materials, including plasterboards, can be recycled.
• This helps to reduce the amount of waste in landfills
www.siniat.co.uk/sustainability/ www.british-gypsum.com/sustainable.aspx
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Fixings
Plasterboards can be fixed with:
• Galvanised nails
(clout nails)
• Drywall screws
• Collated screws (countersunk phillips)
Nails should be
galvanised and screws
should be zinc plated or
coated. This will prevent
the heads from ‘rusting’
through.
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Fixing plasterboards
Due to the different thickness of boards and the need to make them secure, different lengths of screws and nails must be used.
Size of board in mm Size of screw in mm
9.5 32
12.5 38
15 38
19 41
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Fixing plasterboards … continued
• Screws should be spaced 300mm apart.
• Nails should be spaced 150mm apart.
• Fixings should be a minimum of 13mm from the edges.
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Fixing plasterboards … continued
• Screws provide a more secure fixing than nails.
• Screws can easily be removed compared to nails.
• BUT power of some form is needed to make it easier to use screws.
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Fixing plasterboards … continued
Staggering boards:
• adds strength
• distributes the weight
• means they are less likely to crack.
Joints should be covered in scrim tape.
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Fixing plasterboards … continued
• Heads must grip the paper but not puncture the core.
• The boards should be pulled tight to the studs.
www.youtube.com/watch?v=ARka0CKOqxM
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Openings
• When fixing to walls with
door openings, certain
aspects must be taken
into consideration.
• Movement can occur on
the wall from the door
and cause cracking.
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Openings
In order to combat this problem, it is advisable to cut the boards so that they are not running in line with the frame
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Switches and sockets
• Switches and sockets should be measured out and cut prior to fixing.
• There are many ‘tricks of the trade’ that your tutor can show you
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Switches and sockets
• A good method is to measure out the required opening.
• Draw it out on the board.
• Drill the four corners.
• The holes can now be joined by scoring with a knife and small straight edge.
• A pad saw can now be used to cut out the opening.
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
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Any questions?
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