Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
PowerPoint
presentation
Material recognition
Unit 124: Applying floating coats to wall
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Assessment criteria
1.1 describe different types of materials used for applying
floating coats to wall
2.1 comply with specifications and schedules for applying
floating coats to wall
2.2 select equipment, tools and materials for applying
floating coats
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Floating coat
• The floating coat is a backing layer of plastering
material that is applied to provide a base for the final
coat.
• Its purpose is to plumb and flatten the wall.
• The correct materials and mix ratios to use will be
found in the specification.
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
The materials used for floating coats consist of the following:
• aggregates:
• sand
• perlite
• vermiculite
• ordinary portland cement
• lime
• lightweight plasters (different grades for differing
backgrounds)
• additives (such as waterproofers).
Materials
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
www.youtube.com/watch?v=wMy0k3ri_Ho
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Bonding plaster
• For use on low suction backgrounds
• Retarded hemihydrate gypsum
plaster with exfoliated vermiculite
aggregate
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Bonding-Coat.pdf
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Bonding plaster
To what backgrounds could
we apply Bonding plaster?
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Bonding-Coat.pdf
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Bonding plaster
Background Thickness
applied
Plasterboard 8mm
Concrete
walls
11mm
Concrete
ceilings
8mm
EML 11mm
Treated
surfaces
8mm
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Hardwall plaster
• For use on masonry backgrounds
• Retarded hemihydrate gypsum
plaster with special
additives/aggregates
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Hardwall.pdf
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Hardwall plaster
To what backgrounds
could we apply Hardwall?
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Hardwall.pdf
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Hardwall plaster
Background Thickness
applied
Common
bricks
11mm
Lightweight
blocks
11mm
No fines
concrete
11mm
Aerated
blocks
11mm
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Tough Coat plaster
• For use where a stronger backing is required
• Hallways/corridors
• Higher impact resistant
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Tough-Coat.pdf
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Tough Coat plaster
Where would we use Tough Coat?
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Tough-Coat.pdf
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Tough Coat plaster
Background Thickness
applied
Common
bricks
11mm
Lightweight
blocks
11mm
No fines
concrete
11mm
Aerated
blocks
11mm
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Browning plaster
• Undercoat for moderate suction
backgrounds
• Retarded hemihydrate gypsum
plaster with exfoliated perlite
aggregate
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Browning.pdf
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Browning plaster
To what backgrounds
could we apply
Browning?
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Browning.pdf
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Browning plaster
Background Thickness
applied
Common
bricks
11mm
Lightweight
blocks
11mm
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Dri-Coat plaster
• Cement-based undercoat
• Used as part of DPC system
• Coverage 11mm
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Dri-Coat.pdf
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Sand/cement
A cheaper alternative to Dri-Coat for a DPC system is
to use ordinary portland cement and a well graded
sand.
A waterproofer must be
added to the manufacturer’s
instructions
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
X-Ray plaster
Undercoat plaster used in areas
where X-rays are taken
Retarded hemihydrate gypsum
plaster with barytes aggregate
www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-X-Ray.pdf
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Universal plaster
• A one-coat plaster that is a combined backing
and finish plaster
• Hand-applied
• Trowel/sponge/trowel finish
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
MP 75 plaster
• A one-coat plaster
• Machine-applied
• Trowel finish
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Plaster angle bead
• Used for providing a true
external corner
• Nosing allows for 10mm
to 13mm of plaster
www.expamet.co.uk/maxicon-angle-bead
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Plaster stop bead
• Used for providing a neat
stop to the plaster
• Available in 10mm to
20mm thickness
www.expamet.co.uk/product/plasterers-accessories/metal-bead-internal-use/stop-bead
Level 1 Diploma in Plastering
© 2013 City and Guilds of London Institute. All rights reserved.
Any questions?
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