Great Gatehouse, Hampton Court

Haired Basecoat Plaster (With Fibres)

RJ2.02

Non-hydraulic lime putty base-coat plaster produced from 6 month mature Chalk lime putty mixed with washed medium limestone sands at a ratio of 1:2.5 by volume. Fibres are added at a rate equivalent to 2.5 kgs animal hair per tonne (SPH5). We strongly recommend that SPH7 with additional fibres (equivalent to 3.5 kgs animal hair per tonne) is used for the ‘pricking-up’ coat to ceiling laths.

Environmental Considerations: 

Lime Putty plaster is an environmentally sustainable product.

Usage/Purpose: 

For internal plaster base-coats (dubbing, pricking-up/scratch, and float) where a soft, porous, permeable plaster is appropriate. Base-coat plasters are applied in maximum 10mm thick coats and finished with Fine Finish Plaster (RJ 2.04) and decorated with a permeable paint such as Limewash (RJ 3.01/3.02), or Soft or Casein Distemper (RJ 4.01/RJ4.02). Do not apply Oil-Bound Distemper (RJ 4.03) to new lime plaster.

Shelf Life: 

Unlimited. Matures with age. Lime putty plasters stiffen during storage, but can be plasticised without the addition of water by thorough re-mixing.

Coverage: 

Approx 50 m2/ tonne at 10mm thickness

Availability: 

Heat-sealed bags (c.25kgs, 40/tonne); 15 litre tubs (c.28kgs, 36/tonne) Bulk bags (c. 1 tonne). Standard mixes are supplied ex Stock.

Health & Safety: 

CALCIUM HYDROXIDE Ca(OH)2 Alkali (pH 13).

CAS No 1305-62-0.

EINECS No 215-137-3.

Danger: H318 Causes Serious Eye Damage.

Warning: H315 Causes skin irritation.

See Health and Safety Data Sheet RJ 5.02.

Technical Specification: 

TAN 7 Internal Plain Lime Plastering.

TAN 9 Hair/fibre reinforcement in basecoat plasters.

TGN 5 The use of Haired Basecoat Plaster & Fine Finish

RJ 2.09 External Lime Putty Renders.

Observations: 

Tradesmen familiar with the use of lime putty plaster, and with experience of its successful use should be employed. Lime putty plasters do not perform as gypsum, hydraulic lime or cement based materials and set only by reaction with atmospheric carbon dioxide in the presence of moisture. This ‘carbonation’ is a slow process and control of the drying and curing process by mist-spraying, ‘tending’ and protecting is crucial to long-term performance. Protections are essential. Do not use below a temperature of 5°C or above 25°C. Do not use if there is risk of frost.