Preparation and Mixing

1. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
PowerPoint
presentationPreparation and mixing
Unit 125: Applying setting coats to wall

2. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Assessment criteria
1.2 describe the importance of clean water
1.3 state the effects of out of date plasters
2.2 select equipment, tools and materials to apply setting
coats to wall
2.3 mix plasters
2.7 follow current environmental and current health and
safety regulations

3. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Preparation
First impressions count!
Good preparation can
assist in making sure your
clients are happy.
• Work area should be
protected.
• Sheets in place to
protect surroundings
from plaster.
• Frames, etc taped up.

4. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Make sure that all
beads are fixed if they
are needed.
Skim beads should be
fixed using staples,
clout nails, plaster dabs
or screws.
Preparation
www.youtube.com/watch?v=Xl9xn57c0QA

5. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Preparation
• All joints to
plasterboard walls
should be covered
with scrim tapes.
• This will help to
reduce the chance
of cracking.

6. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Preparation
Plasterboard walls should be
swept with a soft brush if the
walls have been boarded and left
for a while.
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Board-Finish.pdf

7. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Preparation
• Floated walls with an adequate key
should be scraped back to remove all
the snots.
• Internal angles should be cut back to
prevent them being rounded.
• It is a good idea to test the suction of
floated walls.
• Walls that have been left for a period
of time may need to be treated to
control the suction.

8. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Mixing area
It is good practice to set up a
mixing area.
• This should be near a
source of water and power
supply (if needed and
reduced to 110V).
• Good ventilation required.
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Spray-Finish.pdf

9. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Mixing
• All mixing buckets should be
clean.
• Mixers should be clean.
• Any contamination can
reduce setting times.

10. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Mixing
Spot board should be
clean.
Any particles of old plaster
can get into the mix and
cause problems when
applying.

11. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Water used should be cold,
clean and fit to drink.
• Hot water will reduce
the setting time.
• Dirty water will cause a
flash set.
www.youtube.com/watch?v=SAYEA94brfs
Mixing

12. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Mixing
Before mixing, it is a very good idea to check
the plaster that is going to be used.
Out of date plaster will cause problems by
setting too fast (flash set) and will create a
weaker finish.

13. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Mixing
• Bags of plaster are printed with the use by
date on them.
• Wastage costs money!!!!
• Bags should be kept off the floor in a dry
area.
• They should be stored no more than five
bags high.

14. Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Any questions?