Heritage (plastering)

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Solid plastered surfaces conservation

We have doubled the grant rates for short course tiers 1 – 3. To address rising costs, you can now receive higher rates on course achievements from 1^st April 2023

Grant Tier

Achievement date before 1 April 2023

Achievement date on or after 1 April 2023

Grant Tier 1

Grant Tier 1 Refresher

£30

£15

£60

£30

Grant Tier 2

Grant Tier 2 Refresher

£70

£35

£140

£70

Grant Tier 3

Grant Tier 3 Refresher

£120

£60

£240

£120

Last updated: 25 May 2022
Grant rate/tier: £140 (Tier 2)
Grant code: GET3212

Overview

The purpose of this standard is to provide the delegate with the knowledge to support the use and application of the underpinning historical, technological and theoretical knowledge and the requisite practical skills to undertake the correct evaluation and selection of materials, tools, equipment and craft practices relevant to solid plastered surfaces conservation.

Find a course for this standard

Duration

Minimum 3 days of 6 learning hours per day

Purpose/scope

Scope:

written and verbal instructions
remove existing solid plasterwork
record and survey
timber lathing
remove debris
protect existing plasterwork
provide adequate key
internal and external plasterwork
in situ mouldings
rapid drying out or freezing
rake out and repair cracks
resources to stabilise plasterwork
mechanical fixings
grouting materials
lath and plaster
cement casting
like for like materials
curing and mist spraying
curing OPC casts
wet casting and semi-dry casting
short breaks
joint rules and busks

Occupational relevance

Training delivered against this standard would be relevant to the following occupational groups:

operative and craft
supervision
management and leadership

Delegate pre-requisites

There are no delegate pre-requisites as part of this standard.

Instruction/ supervision

As a minimum, course trainers must be able to demonstrate that, in relation to this standard, they have:

an award in education and training (or equivalent, as per requirements for approved training organisations)
successfully completed training to this standard
at least 5 years relevant industrial experience
a verifiable CV

Delivery

Delivery may be in an on or off the job environment.

All materials and equipment must be of a suitable quality and quantity for delegates to achieve learning outcomes and must comply with relevant legislation.

The class size and delegate/trainer ratio must allow training to be delivered in a safe manner and enable delegates to achieve the learning outcomes.

The following delivery methods may be used in the delivery of this standard:

classroom
a blend of classroom and remote

This standard is considered to contain 51% or more practical training.

This standard is considered to be set at an intermediate/advanced level.

Assessment

For the successful completion of training, delegates must complete an end of course practical assessment or knowledge test that measures all learning outcomes and has a pass or fail criteria.

Where this training is assessed using multiple-choice questions, a minimum of 10 questions must be asked and delegates are required to achieve an overall pass mark of at least 80%.

Quality assurance

Assured

Quality assurance against this standard will require initial approval of the training organisation and their content mapped to the standard.

CITB will also conduct an approval intervention, either desk-based or centre visit, to ensure the training organisation can meet the requirements of the training standard.

Approved training organisations (ATOs) will be required to present information on records of training and assessment upon request to CITB for desk-based analysis. They will also be visited annually by the CITB quality assurance team.

Renewal

There are no mandatory renewal or recommended refresher requirements for this standard.

Classification

Lifetime

Please note standards using this classification will only be grant aided once per delegate

Approval date

February 2022

Review cycle

On request or 3 years from approval date.

Learning outcomes

Learning outcomes
The delegate will be able to:	Additional guidance to support learning outcome:
carry out written and verbal instructions
select and use hand tools to remove existing solid plasterwork	to include: lump hammer bolster chisel cold chisel scutch hammer mechanical stripping tool (kango hammer)
cut away existing solid plasterwork
record and survey plasterwork condition
demonstrate how to: remove timber lathing fix timber lathing clean down backgrounds remove debris from work area protect existing plasterwork from damage when carrying out the works
demonstrate how to: provide adequate key on various backgrounds apply and finish internal and external plasterwork produce in situ mouldings repair in situ mouldings provide aftercare to prevent damage from rapid drying out or freezing rake out and repair cracks
select and use the resources required to stabilise plasterwork	to include: limes cements including natural cement timber types of lathing fixings for lathing sands and other aggregates proprietary lime renders proprietary lime bonding materials natural materials (hair/wattle/ reeds) additives: accelerators/air entrainers/retarders/water
demonstrate methods of securing loose plaster from the face using mechanical fixings or insertion of grouting materials
demonstrate methods of securing loose areas of lath and plaster ceilings	to include: from above or below where laths are damaged by dry rot or insects where plaster keys have been damaged above
prepare a mould for cement casting
gauge and mix casting materials	to include: prepare mould for casting (wet and semi dry method) select lime/cements/sands/clean water for mixing gauge and mix casting materials place and compact mixed materials finish cast produced cure cast for up to 1 week keep damp place and compact mixed materials in mould
explain the purpose of using like for like materials
explain the purpose of curing and mist spraying of solid backgrounds
select material which is of the type appropriate to period of work	to include: plasters cements sand and other aggregates limes hair fixings additives
explain the purpose of curing Ordinary Portland Cement (OPC) casts	to include: moisture must be in place to allow for continued hydration to take place the setting action must continue between the OPC and moisturiser for up to 7 days this method of curing ensures a hardened cast the cast object can be immersed in water covered with plastic sheeting covered with hessian and kept damp
explain the difference between wet casting and semi-dry casting	The Wet method of casting is where there are a number of moulds to cast but are not on a time scale, so with this method the mix is made up to a slurry and poured into the moulds. After two or three days the casts are removed and allowed to cure. This is sometimes called flood moulding. It must be remembered that sand and cement mix is slow setting. The Semi-Dry method is used where there is a short supply of moulds so the mix is gauged with just enough water to bind the aggregate and cement together. This mix is then tamped into the mould in layers. When completed the mould is turned upside down and the cast is removed. This system is the same as the one used on a bench with the bucket and spade. The cast is cured in the same way.
explain how to run mouldings in-situ
explain how to run down short breaks
explain how to cut and plant short breaks
explain how to finish moulding/mitres using joint rules and busks
explain how to validate ways in which the work should be carried out
explain the following roles and responsibilities: the client the principal designer the conservation architect the main contractor