L6708 13 l1_124_presentation_1

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



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



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.



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



www.youtube.com/watch?v=wMy0k3ri_Ho



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



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



Bonding plaster

Background Thickness

applied

Plasterboard 8mm

Concrete

walls

11mm

Concrete

ceilings

8mm

EML 11mm

Treated

surfaces

8mm



Hardwall plaster

• For use on masonry backgrounds


plaster with special

additives/aggregates

www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Hardwall.pdf



Hardwall plaster

To what backgrounds

could we apply Hardwall?

www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Hardwall.pdf



Hardwall plaster


applied

Common

bricks

11mm

Lightweight

blocks

11mm

No fines

concrete

11mm

Aerated

blocks

11mm



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



Tough Coat plaster

Where would we use Tough Coat?

www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Tough-Coat.pdf

http://www.british-gypsum.com/pdf/PDS-021-01 Gyproc ThermaLine BASIC.pdf

http://www.british-gypsum.com/pdf/PDS-021-01 Gyproc ThermaLine BASIC.pdf



Tough Coat plaster


applied

Common

bricks

11mm

Lightweight

blocks

11mm

No fines

concrete

11mm

Aerated

blocks

11mm



Browning plaster

• Undercoat for moderate suction

backgrounds


plaster with exfoliated perlite

aggregate

www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Browning.pdf



Browning plaster

To what backgrounds

could we apply

Browning?

www.british-gypsum.com/~/media/Files/British-Gypsum/Data-Sheets/PDS-Thistle-Browning.pdf



Browning plaster


applied

Common

bricks

11mm

Lightweight

blocks

11mm



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



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



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



Universal plaster

• A one-coat plaster that is a combined backing

and finish plaster

• Hand-applied

• Trowel/sponge/trowel finish



MP 75 plaster

• A one-coat plaster

• Machine-applied

• Trowel finish



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



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



Any questions?

L6708 13 l1_124_presentation_1

Education

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