Select and maintain materials, tools and equipment for specified plastering work.
Prepare work areas for plastering.
Batch and mix plaster.
Apply plaster to various types of surfaces.
Install mouldings and repair damaged plaster.
Implement emergency safety procedures when required.
Hazards of working with cement, cement extenders, aggregates, admixtures and sand/cement mixes.
How to work safely with cement and plaster.
Setting out and batching plaster mixes.
Different types of cement, cement extenders, workability improvers and their correct application.
Characteristics and selection of appropriate cements, fine and coarse aggregates and additives (including bonding agents) and gypsum-based skim coats.
Unsuitable materials for exterior work (e.g. agricultural lime, lime-wash, gypsum-based products, etc).
Preparation of surfaces, estimating and controlling rates of suction/absorption.
Properties of fine aggregates and their effect on the workability and cohesion of fresh plaster.
The role of bonding agents and their correct use.
Plaster production processes, including material selection, batching and mixing of plaster by hand and in a mechanical mixer, and cleaning and maintenance of mixers.
Rules of best practice for plaster, sand-cement mortar and gypsum plaster.
Blending different aggregates (sands) to improve grading.
When to use additives (e.g. hydrated builder’s lime).
Mix proportions for plaster and skim coats.
Factors affecting strength of plaster.
The importance of cement/water ratios and their effect on the strength of plaster.
Compaction of sand/cement plaster and curing.
Estimating quantities of batched mixes.
Consequences of incorrect batching, poor mixing and over-batching.
Consequences of “retempering” or adding extra water to a plaster mix that has stiffened.
Consequences of plastering walls in full sun and/or exposing plastered surfaces to drying wind conditions.
Relevant sections of the National Building Regulations and SABS Codes (e.g. 0400).
Special precautions to be taken when plaster has to be applied very thinly or built up to a thick layer.
Problems resulting from applying plaster either too thinly or too thickly.
Scaling of drawings.
Symbols used on drawings.
Types and uses of working drawings.
Finishing off plaster surfaces by striking off, floating and trowelling.
All relevant legal requirements, Health and Safety Regulations and manufacturers’ specifications.
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Select and maintain materials, tools and equipment for specified plastering work
Materials, tools and equipment properties, purposes, and applications are described according to their
Materials, tools and equipment are selected for specified tasks (fit-for-purpose).
Materials, tools and equipment are checked against manufacturers’ specifications and criteria contained in work plans, in order to implement corrective action if any defective or faulty materials, tools and equipment do not meet prescribed requirements.
Prepare work areas for plastering
Work areas are identified, measured and set out according to specifications provided.
Work tasks are communicated and agreed to according to specified procedures.
Areas are identified for batching and mixing plaster in order to meet requirements for proximity to specific work areas/transport.
Batch and mix plaster
Unsuitable materials are identified and removed before mixing.
Plaster mixes are batched according to specifications and work requirements.
Batch sizes are checked to ensure that mixes are used before stiffening.
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