Working on conservation and restoration projects in the workplace — ProQual Awarding Body Occupational Qualification Construction & Building Services Revision

    This element focuses on the practical application of heritage roofing skills within live conservation and restoration projects. It requires the learner to

    Topic Synopsis

    This element focuses on the practical application of heritage roofing skills within live conservation and restoration projects. It requires the learner to interpret project-specific information, source appropriate traditional materials, and execute work that respects the historical integrity of the structure while meeting modern health, safety, and contractual standards. The emphasis is on meticulous planning, minimising harm to existing fabric, and delivering authentic, durable outcomes within agreed timeframes.

    Key Concepts & Core Principles

    Exam Tips & Revision Strategies

    Common Misconceptions & Mistakes to Avoid

    Examiner Marking Points

    Working on conservation and restoration projects in the workplace

    PROQUAL AWARDING BODY
    vocational

    This element focuses on the essential competencies required to carry out conservation and restoration projects involving wood occupations within the heritage sector. Learners must demonstrate the ability to interpret project information accurately, adhere to legal and best-practice frameworks, maintain health and safety, select appropriate resources, protect the historic fabric, and deliver work to contractual specifications within set timeframes.

    10
    Learning Outcomes
    24
    Assessment Guidance
    29
    Key Skills
    11
    Key Terms
    33
    Assessment Criteria

    Assessment criteria

    ProQual Level 3 NVQ Diploma in Heritage Skills – Wood Occupations (Construction)
    ProQual Level 3 NVQ Diploma in Heritage Skills – Roof Tiling and Slating Occupations (Construction)
    ProQual Level 2 NVQ Diploma in Plastering (Construction)
    ProQual Level 3 NVQ Diploma in Heritage Skills (Construction) - Solid Plastering
    ProQual Level 3 NVQ Diploma in Heritage Skills (Construction) - Mason
    ProQual Level 3 NVQ Diploma in Heritage Skills (Construction) – Fully Supported Lead & Hard Metal Roofing and Cladding

    Topic Overview

    The ProQual Level 3 NVQ Diploma in Heritage Skills – Roof Tiling and Slating Occupations (Construction) is an advanced vocational qualification designed for experienced roofers who wish to specialise in the conservation and repair of historic roofs. This qualification focuses on the traditional skills and knowledge required to work on listed buildings, scheduled monuments, and other heritage structures, where modern roofing techniques may be inappropriate or damaging. It covers the use of natural materials such as clay plain tiles, natural slates, and stone slates, as well as traditional fixing methods like pegging, torching, and lime mortars.

    This qualification is essential for maintaining the UK's built heritage, as it ensures that roofers understand the principles of conservation, including the importance of breathability, reversibility, and matching original materials. It also covers health and safety considerations specific to heritage sites, such as working at height on fragile roofs and handling hazardous materials like lead and asbestos. By achieving this NVQ, you demonstrate competence in complex tasks such as setting out and fixing random slating, forming valleys and hips using traditional methods, and carrying out repairs to historic roof structures.

    The qualification is part of the wider Construction & Building Services sector and is recognised by heritage organisations like Historic England and the National Trust. It typically takes 12-18 months to complete and involves on-site assessment by a qualified assessor. Successful completion can lead to roles such as heritage roofer, conservation roofer, or site supervisor on heritage projects, and it may also provide a pathway to further qualifications in building conservation.

    Key Concepts

    Core ideas you must understand for this topic

    • →Conservation principles: Understand the philosophy of minimum intervention, reversibility, and like-for-like repairs. This includes using traditional materials and techniques that are compatible with the historic fabric.
    • →Material identification and sourcing: Be able to identify different types of natural slate (e.g., Welsh, Westmorland, Delabole) and clay plain tiles, and know how to source reclaimed or matching materials for repairs.
    • →Traditional fixing methods: Master techniques such as pegging (using oak pegs to fix slates), torching (applying lime mortar to the underside of slates), and using lead wedges and tingles for fixing.
    • →Setting out and laying random slating: Understand how to set out courses to achieve a random appearance while maintaining correct headlap and side lap, and how to cut and fix slates to irregular roof shapes.
    • →Heritage health and safety: Know the specific risks associated with heritage roofs, including fragile roofing materials, lead dust, and the need for careful access to avoid damaging historic fabric.

    Learning Objectives

    What you need to know and understand

    • Interpret the given information relating to the work and resources when working on conservation and restoration projects, Know how to comply with relevant legislation and official guidance when working on conservation and restoration projects, Maintain safe and healthy working practices when working on conservation and restoration projects, Select the required quantity and quality of resources for the methods of work to work on conservation and restoration projects, Minimise the risk of damage to the work and surrounding area when working on conservation and restoration projects, Complete the work within the allocated time when working on conservation and restoration projects, Comply with the given contract information to work on conservation and restoration projects to the required specification
    • Interpret the given information relating to the work and resources when working on conservation and restoration projects, Know how to comply with relevant legislation and official guidance when working on conservation and restoration projects, Maintain safe and healthy working practices when working on conservation and restoration projects, Select the required quantity and quality of resources for the methods of work to work on conservation and restoration projects, Minimise the risk of damage to the work and surrounding area when working on conservation and restoration projects, Complete the work within the allocated time when working on conservation and restoration projects, Comply with the given contract information to work on conservation and restoration projects to the required specification
    • Interpret the given information relating to the work and resources when working on conservation and restoration projects, Know how to comply with relevant legislation and official guidance when working on conservation and restoration projects, Maintain safe and healthy working practices when working on conservation and restoration projects, Select the required quantity and quality of resources for the methods of work to work on conservation and restoration projects, Minimise the risk of damage to the work and surrounding area when working on conservation and restoration projects, Complete the work within the allocated time when working on conservation and restoration projects, Comply with the given contract information to work on conservation and restoration projects to the required specification
    • Interpret the information relating to the work and resources when working on conservation and restoration projects. Know how to comply with environmentally responsible work practices to meet current legislation and official guidance when working on conservation and restoration projects. Maintain safe and healthy work practices when working on conservation and restoration projects. Select the required quantity and quality of resources for the methods of work to work on conservation and restoration projects. Minimise the risk of damage to the work and surrounding area when working on conservation and restoration projects. Complete the work within the allocated time when working on conservation and restoration projects. Comply with the given contract and specification information to carry out the work safely and efficiently.
    • Interpret the information relating to the work and resources when working on conservation and restoration projects. Know how to comply with environmentally responsible work practices to meet current legislation and official guidance when working on conservation and restoration projects. Maintain safe and healthy work practices when working on conservation and restoration projects. Select the required quantity and quality of resources for the methods of work to work on conservation and restoration projects. Minimise the risk of damage to the work and surrounding area when working on conservation and restoration projects. Complete the work within the allocated time when working on conservation and restoration projects. Comply with the given contract and specification information to carry out the work safely and efficiently.
    • Analyse project specifications and technical drawings to determine the required materials and methods for a conservation roofing task.
    • Apply current health and safety regulations, including COSHH and manual handling, specifically within a heritage roofing context.
    • Justify the selection and quantity of traditional materials (e.g., code 7 lead, hard metal) based on structural assessments and conservation principles.
    • Demonstrate the correct techniques for handling and installing traditional roofing materials to minimise damage to both the new work and existing historic fabric.
    • Evaluate the completed work against contractual specifications and quality standards typical for conservation projects.

    Assessment Criteria

    Key criteria assessors look for in your portfolio

    • Award credit for demonstrating thorough interpretation of work-related information, such as drawings, specifications, schedules, and method statements specific to conservation and restoration.
    • Award credit for providing clear evidence of compliance with relevant legislation and official guidance, including heritage protection law, CDM regulations, and any specific conservation philosophy.
    • Award credit for consistently maintaining safe and healthy working practices, including risk assessments, COSHH evaluations, and use of appropriate PPE when handling traditional materials.
    • Award credit for selecting the correct quantity and quality of resources, including matching traditional timber species, fixings, and finishes, and justifying choices with reference to authenticity and performance.
    • Award credit for demonstrating effective measures to minimise the risk of damage to the work and surrounding area, such as protective sheeting, exclusion zones, and careful handling techniques.
    • Award credit for completing allocated tasks within the agreed timeframes without compromising quality standards or conservation principles.
    • Award credit for strictly complying with contract information, ensuring finished work meets the required specification as verified by inspection or testing.
    • Award credit for demonstrating accurate interpretation of project specifications, drawings, and schedules, including any restrictions related to heritage significance or conservation philosophy.
    • Award credit for selecting, handling, and storing materials (e.g., reclaimed tiles, lime mortar) in strict accordance with both project requirements and conservation principles, ensuring quality and provenance are documented.
    • Award credit for setting up and maintaining a safe working environment that protects the historic structure, adjacent surfaces, and public, with clear evidence of risk assessments, method statements, and use of appropriate access equipment.
    • Award credit for working methodically to achieve the required finish and specification, as verified by photographic evidence, witness testimonies, and inspection records, while adhering to the allocated time budget and contractual obligations.
    • Award credit for demonstrating accurate interpretation of project specifications, including detailed drawings and schedules, to identify conservation requirements.
    • Award credit for strict adherence to relevant legislation such as listed building consent and health and safety regulations, evidenced in risk assessments and method statements.
    • Award credit for the selection and justification of materials (e.g., lime plasters) that match original substrates, showing understanding of breathability and durability.
    • Award credit for implementing protective measures to safeguard surrounding historic features and finishes from damage during work.
    • Award credit for completing tasks within the agreed timeframe while maintaining quality standards, evidenced by supervisor reports and photographic records.
    • Award credit for complying with contractual obligations, including waste management and site cleanliness, as specified in the project brief.
    • Accurate interpretation of conservation project documentation, including drawings, specifications, and schedules, with evidence of cross-referencing to site conditions.
    • Selection and justification of appropriate traditional materials (e.g., lime-based plasters) matched to the building's period, substrate, and exposure, with records of compatibility tests.
    • Demonstration of safe working practices that comply with current health and safety legislation, such as COSHH assessments for hazardous materials and safe access on fragile heritage structures.
    • Effective protection of surrounding historic fabric, features, and finishes using reversible methods, with photographic evidence of protective sheeting, barriers, and dust control.
    • Award credit for accurately interpreting conservation plans, specifications, and schedules of work to determine repair scopes and material requirements.
    • Credit must be given for selecting and preparing traditional materials (e.g., lime mortars, stone types) that match existing fabric in composition, texture, and colour.
    • Assess for implementation of protective measures such as temporary covers, dust suppression, and exclusion zones to safeguard historic fabric and adjacent areas.
    • Look for evidence of compliance with environmental legislation, including waste management and minimising carbon footprint through local material sourcing.
    • Confirm that the candidate completes tasks within agreed timescales without compromising quality, demonstrating effective time management and sequencing of work.
    • Require demonstration of safe working practices, including risk assessments, manual handling of heavy stone, and use of appropriate PPE when working at height or with hazardous substances.
    • Award credit for evidence of accurately reading and interpreting project drawings, schedules, and conservation plans.
    • Credit given for demonstrated compliance with relevant heritage legislation, such as listed building consent or guidance from Historic England.
    • Evidence must clearly show the correct selection and justification of traditional materials, linking choice to historical accuracy and durability.
    • Assessor observation of safe working practices, including the use of appropriate PPE and dust control measures when working on historic sites.
    • Portfolio evidence must include a clear timeline that shows the work was completed within the allocated duration, with justification for any deviations.
    • Award credit for photographic or documented proof that the surrounding area and existing heritage fabric were adequately protected during the work.

    Assessment Guidance

    Guidance for achieving higher grades

    • 💡For NVQ portfolio building, ensure every piece of evidence is explicitly cross-referenced to the relevant learning outcome and assessment criterion; use annotations to explain how the evidence meets heritage-specific requirements.
    • 💡Include photographic evidence showing protective measures in place (e.g., temporary covers, clean working techniques) to demonstrate minimisation of damage — assessors value visual proof.
    • 💡When documenting compliance with legislation, reference specific clauses or documents (e.g., sections of the Building Regulations, British Standards) in your witness testimonies or reflective logs.
    • 💡Time management evidence can be strengthened by including signed program schedules or a diary of progress, showing how you planned and adjusted to meet the allocated deadline.
    • 💡For the NVQ portfolio, ensure every piece of evidence explicitly links to a specific conservation decision: annotate photos showing how you matched existing profiles, salvaged materials, or followed method statements for listed buildings.
    • 💡When being observed, verbally highlight your compliance actions, such as pointing out protective coverings, waste segregation for historic debris, or checks against original fabric before proceeding—this turns tacit knowledge into assessable evidence.
    • 💡Practice explaining the ‘why’ behind your resource choices, particularly if substituting materials; be ready to discuss how you balanced authenticity, availability, and performance to meet the contract specification.
    • 💡In your portfolio, include a clear narrative explaining how you interpreted the contract information and applied it to the conservation project, with cross-references to evidence.
    • 💡Ensure risk assessments and method statements specifically address conservation concerns, such as dust control and vibration limits near fragile structures.
    • 💡Show photographic evidence of protection measures in place before starting work, and of the completed work demonstrating faithful replication of historical details.
    • 💡Demonstrate knowledge of traditional plastering materials (like lime putty) and their properties, as questions from assessors will test this.
    • 💡Keep a daily log of time management, noting any delays due to conservation constraints, to justify compliance with allocated time.
    • 💡During practical observations, verbalise your reasoning for material choices and methods, linking directly to conservation principles and the project specification.
    • 💡Compile a comprehensive digital portfolio with annotated photographs, COSHH sheets, and time logs to evidence compliance with environmental and contractual requirements.
    • 💡In written assessments, explicitly reference relevant legislation and guidance, such as the Building Regulations Approved Document L, BS 7913, and Historic England's Practical Building Conservation series.
    • 💡Always reference current industry standards such as BS 7913:2013 (Guide to the conservation of historic buildings) in your evidence to demonstrate underpinning knowledge.
    • 💡Include annotated photographs and a detailed work log showing each stage of the process—preparation, intervention, and protection—to provide clear evidence of your methods.
    • 💡Highlight your selection of materials by providing samples, technical data sheets, and justifications for their compatibility with the host structure.
    • 💡Demonstrate environmental awareness by documenting how you minimised waste, reused original materials, and followed any site-specific environmental plans.
    • 💡Show evidence of communication with conservation officers, clients, or supervisors to prove you can interpret and act on complex heritage requirements.
    • 💡Ensure your evidence portfolio includes annotated photographs that clearly demonstrate each stage of the work, linking to specific performance criteria.
    • 💡When completing written reflections, explicitly reference the relevant heritage legislation or guidance (e.g., BS 7913) used to inform your decisions.
    • 💡During assessor observations, verbally explain your material choices and handling techniques to showcase your underpinning knowledge.
    • 💡Always cross-reference the contract specification with your completed work evidence to prove full compliance with the required standard.
    • 💡When assessing your practical work, examiners look for evidence of planning and methodical working. Always start by checking the roof structure and making a detailed survey of the existing materials before beginning any work.
    • 💡In written assessments, use technical vocabulary correctly (e.g., 'headlap', 'gauge', 'margin') and explain the reasoning behind your choice of materials and methods. Refer to conservation principles and relevant standards like BS 5534.
    • 💡Pay close attention to detailing at junctions, such as valleys, hips, and abutments. These are common areas where marks are lost. Practice forming lead soakers and flashings to a high standard.

    Common Mistakes

    Common errors to avoid in your coursework

    • Using modern, non-compatible materials (e.g., cement-based mortars, impermeable coatings) that trap moisture and cause accelerated decay in historic timber.
    • Failing to obtain detailed pre-existing condition surveys, leading to unrecorded defects being covered up or worsened during restoration.
    • Neglecting to follow the hierarchy of conservation (repair rather than replacement) and unnecessarily replacing historic fabric with new materials.
    • Poor segregation of work areas, resulting in contamination or physical damage to adjacent heritage features not under restoration.
    • Inadequate chain of custody or recording of materials selection, making it difficult to prove compliance with conservation requirements in the portfolio.
    • Misinterpreting scaled drawings or specifications, leading to dimensional inaccuracies in joinery repairs or installations.
    • Failing to account for the subtle variations in traditional materials (e.g., tile camber, nail hole positions) when setting out, leading to uneven courses or poor lapping.
    • Neglecting to protect fragile roof elements (such as lead flashings or historic joinery) from foot traffic, tool damage, or mortar splashes during works.
    • Misinterpreting contract information that requires like-for-like replacement, resulting in the use of modern equivalents that compromise the building's character and may breach statutory consent conditions.
    • Prioritising speed over quality control, causing rushed bedding, incorrect nailing patterns, or insufficient curing time for lime mortars, which often leads to premature failure in assessments.
    • Failing to identify and use the correct traditional mortar mix, leading to incompatibility with historic substrates and potential damage.
    • Overlooking the need for listed building consent or not adhering to specific conservation guidelines, resulting in non-compliance.
    • Applying modern plastering techniques that trap moisture, causing deterioration of underlying historic fabric.
    • Neglecting to protect adjacent surfaces and features, causing accidental splashes or abrasions to delicate original materials.
    • Misinterpreting specification details, leading to incorrect surface preparation or finish.
    • Using modern gypsum or cement-based plasters on historic masonry, causing moisture entrapment and premature decay of the original fabric.
    • Inadequate environmental protection during lime plaster application and curing, leading to shrinkage cracking, carbonation failure, or frost damage.
    • Failing to record the condition of adjacent areas before starting work, resulting in disputes over pre-existing damage.
    • Misinterpreting ‘conservation’ as thorough restoration, leading to over-cleaning or complete replacement of weathered stone instead of repairing or consolidating it.
    • Using modern cement-based mortars instead of appropriate lime mortars, causing accelerated deterioration of surrounding historic masonry due to trapped moisture and inflexibility.
    • Failing to adequately document existing conditions before starting work, which can result in loss of historical evidence and disputes over damage.
    • Neglecting to set up proper dust extraction and containment, leading to contamination of delicate surfaces or protected interior features.
    • Underestimating the time required for traditional techniques like lime mortar curing, leading to rushed work and poor long-term durability.
    • Ignoring site-specific heritage constraints (e.g., listed building consent conditions) and proceeding with unauthorised alterations.
    • Confusing modern building regulations with the specific legislation and guidance applicable to heritage conservation work.
    • Failing to adequately assess the condition of the substrate before applying new materials, leading to hidden defects or future failure.
    • Using generic resource quantities without considering the bespoke nature of heritage projects, resulting in material waste or shortages.
    • Neglecting to set up proper protection for adjacent historic features, causing unnecessary damage and potential project delays.
    • Misinterpreting slim tolerances or bespoke dimensions on heritage drawings, leading to ill-fitting metalwork.
    • Misconception: Modern roofing techniques can be adapted for heritage roofs. Correction: Heritage roofs require traditional methods to maintain breathability and structural integrity. Modern materials like cement mortar can trap moisture and cause decay.
    • Misconception: Reclaimed materials are always better than new. Correction: While reclaimed materials are preferred for authenticity, they must be carefully selected for compatibility and condition. New materials that match the original can be acceptable if reclaimed sources are unavailable.
    • Misconception: Torching is purely decorative. Correction: Torching (lime mortar applied to the underside of slates) is a functional element that provides weatherproofing, insulation, and stability. It must be applied correctly to avoid cracking and falling out.

    Frequently Asked Questions

    Common questions students ask about this topic

    Before You Start

    Prior knowledge that will help with this topic

    • •Level 2 NVQ Diploma in Roofing Occupations (or equivalent experience) – you should already be competent in basic roofing skills such as fixing plain tiles and interlocking tiles.
    • •Understanding of health and safety regulations in construction, including working at height and manual handling.
    • •Basic knowledge of building conservation principles, which can be gained through short courses or reading guidance from Historic England.

    Key Terminology

    Essential terms to know

    • Interpret the given information relating to the work and resources when working on conservation and restoration projects, Know how to comply with relevant legislation and official guidance when working on conservation and restoration projects, Maintain safe and healthy working practices when working on conservation and restoration projects, Select the required quantity and quality of resources for the methods of work to work on conservation and restoration projects, Minimise the risk of damage to the work and surrounding area when working on conservation and restoration projects, Complete the work within the allocated time when working on conservation and restoration projects, Comply with the given contract information to work on conservation and restoration projects to the required specification
    • Interpret the given information relating to the work and resources when working on conservation and restoration projects, Know how to comply with relevant legislation and official guidance when working on conservation and restoration projects, Maintain safe and healthy working practices when working on conservation and restoration projects, Select the required quantity and quality of resources for the methods of work to work on conservation and restoration projects, Minimise the risk of damage to the work and surrounding area when working on conservation and restoration projects, Complete the work within the allocated time when working on conservation and restoration projects, Comply with the given contract information to work on conservation and restoration projects to the required specification
    • Interpret the given information relating to the work and resources when working on conservation and restoration projects, Know how to comply with relevant legislation and official guidance when working on conservation and restoration projects, Maintain safe and healthy working practices when working on conservation and restoration projects, Select the required quantity and quality of resources for the methods of work to work on conservation and restoration projects, Minimise the risk of damage to the work and surrounding area when working on conservation and restoration projects, Complete the work within the allocated time when working on conservation and restoration projects, Comply with the given contract information to work on conservation and restoration projects to the required specification
    • Interpret the information relating to the work and resources when working on conservation and restoration projects. Know how to comply with environmentally responsible work practices to meet current legislation and official guidance when working on conservation and restoration projects. Maintain safe and healthy work practices when working on conservation and restoration projects. Select the required quantity and quality of resources for the methods of work to work on conservation and restoration projects. Minimise the risk of damage to the work and surrounding area when working on conservation and restoration projects. Complete the work within the allocated time when working on conservation and restoration projects. Comply with the given contract and specification information to carry out the work safely and efficiently.
    • Interpret the information relating to the work and resources when working on conservation and restoration projects. Know how to comply with environmentally responsible work practices to meet current legislation and official guidance when working on conservation and restoration projects. Maintain safe and healthy work practices when working on conservation and restoration projects. Select the required quantity and quality of resources for the methods of work to work on conservation and restoration projects. Minimise the risk of damage to the work and surrounding area when working on conservation and restoration projects. Complete the work within the allocated time when working on conservation and restoration projects. Comply with the given contract and specification information to carry out the work safely and efficiently.
    • Heritage material selection and handling
    • Legislative compliance and official guidance
    • Safe and healthy working practices
    • Interpretation of contract and project information
    • Minimising damage to historic fabric
    • Time management and project deadlines

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