Re-lay and replace heritage roof coverings
Overview
This standard is about re-laying and replacing heritage roof coverings, interpreting information, adopting safe, healthy and environmentally responsible work practices, selecting and using materials, components, tools and equipment, in accordance with organisational requirements which are equal to or exceed current statutory and legislative requirements This standard is for people working in the occupational area of heritage skills and can be used by operatives, supervisors and managers
Performance criteria
You must be able to:
Interpretation of information
P1 interpret the information relating to the work and resources as relevant to geographical location and climatic conditions to confirm its relevance for the following:
• drawings
• specifications
• schedules
• method statements
• risk assessments
• manufacturers’ and suppliers’ information
• oral, written or electronic instructions
• current regulations, legislation, official guidance and permits
Safe work practices
P2 comply with the relevant, current legislation and official guidance to carry out the work and maintain safe and healthy work practices relating to the following:
• methods of work
• safe use of appropriate personal protective equipment (PPE)
• safe use of access or lifting equipment
• safe use, storage and handling of materials, tools and equipment
• safe use of health and safety control equipment
• specific risks to occupational health and safety including mental health awareness
• specific risks associated with hazardous or asbestos containing materials
• specific risks associated with, heat, particulates, gas and electricity associated with processes, equipment and materials
Selection of resources
P3 select the required quantity and quality of resources for the methods of work for:
• materials and components
• tools and equipment
Minimise the risk of damage
P4 comply with organisational procedures to minimise the risk of damage to the work and surrounding area by:
• taking relevant steps to protect the work and its surrounding area from accidental or unintended damage
• working with an awareness of the environment in liaison with other occupations
• maintaining a safe, clear and tidy work area
• disposing of waste in accordance with current legislation
Meet the contract specification
P5 comply with the contract information to re-lay and replace heritage roof coverings efficiently to the required specification by:
• demonstrating work skills to:
- record evidence of roofing details
- remove
- clean
- stack
- store
- prepare
- measure
- mark out
- position and secure
- fix
- finish
• using and maintaining hand tools and ancillary equipment
• applying different gauging techniques, using modern tape measures and traditional marking sticks, to at least two of the following:
- formula system to a defined head lap and reducing margins
- double lap slating reducing head lap and reducing margins
- slating in thirds with reducing margins
- three and a half pin with reducing margins
- single lap
- diamond pattern
• stripping existing heritage roof coverings and re-laying either to full or partial re-roofing to working instructions, for flashings, mortars and related fittings and components for at least three of the following but no more than two from each sub-group:
- fixed gauge clay tiles or clay plain tiles or peg tiles or regular sized natural slates
- stone slates or random length and width natural slates
• stripping existing roof coverings and replacing full roofs or elevations to working instructions for at least three of the following:
- vernacular and roofing styles specific to geographical areas (such as Kent pegs or Yorkshire stone slates)
- places of religious worship
- stately homes
- public buildings
- historic buildings
- castles or fortified buildings
- conservation areas
- listed buildings
• applying re-laid heritage materials to working instructions to general areas and to at least seven of the following but no more than one from each sub-group:
- verges
- double or triple eave
- ridge:
o vernacular ridge details
o stone-ridge
o clay-ridge or lead
- hips:
o vernacular hip details
o stone-ridge
o clay-ridge or lead
- single cut valley or chevron valley or collar and tie valley or similar
- laced valley or swept valley
- open valley or close mitred valley
- openings
- top edge and side abutments with and without lead
• replacing roof coverings in the following areas to working instructions for the following:
- verges
- eaves
- ridge
- hips
- valleys
- openings
- top and side abutments
- general areas
Allocated time
P6 complete the work within the estimated, allocated time, taking account of climatic conditions, in accordance with organisational procedures, the programme of work and to meet the needs of other occupations and/or client
Knowledge and Understanding
You need to know and understand:
P1 Interpretation of information
K1 why organisational procedures have been developed and how they are implemented
K2 types of information, their source and how they are interpreted in relation to:
• drawings
• specifications
• schedules
• method statements
• risk assessments
• manufacturers’ and suppliers’ information
• contractual information
• current legislation, regulations, official guidance and permits including but not limited to listed buildings and scheduled monuments
• conservation reports and plans
• oral, written or electronic instructions
K3 the importance of organisational procedures to solve problems with the information, and why it is important to follow them
K4 information for relevant, current legislation, official guidance and site-specific requirements and how it is applied
P2 Safe work practices
K5 how emergencies should be responded to in accordance with organisational authorisation and personal skills in relation to:
• fires and the types of fire extinguishers and how and when they are used in relation to water, CO2, foam and powder
• spillages and injuries
• emergencies relating to occupational activities
• identification of and reporting of hazardous substances including but not limited to asbestos containing materials and lead carbonate
K6 the organisational and site-specific security procedures for tools, plant and equipment in relation to:
• site
• workplace
• vehicles
• company
• operatives
• clients
• the general public
K7 how to report risks and hazards identified by the following:
• methods of work
• risk assessments
• personal assessment
• manufacturers’ technical information
• statutory regulations
• official guidance
• Control of Substances Hazardous to Health (COSHH)
K8 the accident reporting procedures and who is responsible for making the report
K9
why, when and how health and safety control equipment identified by the principles of prevention should be used in relation to:
• collective protective measures
• personal protective equipment (PPE)
• respiratory protective equipment (RPE)
K10 how to comply with environmentally responsible work practices to meet current legislation and official guidance when dealing with potential accidents, health hazards and the environment whilst working in the workplace in relation to:
• confined spaces
• working at height
• tools, plant and equipment
• materials and substances
• moving and storing materials by manual handling and mechanical lifting
P3 Selection of resources
K11 why the characteristics, quality, uses, sustainability, suitability, limitations and defects associated with the resources are important and how defects should be reported
K12 why sustainable and ethical work practices and materials should be adopted
K13 the organisational procedures to select resources, why they have been developed and how they are used K14 how to confirm the resources and materials conform with the specification
K15
how the resources should be used and how any problems associated with the resources are reported in relation to:
• battens, sarking boards, sand, cement, lime, underlay, tiles, natural slates and stone slates, fittings, flashings, insulation, fixings and associated ancillary items
• hand tools and ancillary equipment
• digital equipment
K16 how to identify and report the hazards associated with the resources and methods of work and how they are managed with reference to method statements and risk assessments
K17 methods of calculating the quantity, length, area and wastage associated with the method and procedure to re-lay and replace heritage roof coverings
P4 Minimise the risk of damage
K18 how to protect work and its surrounding area from damage and the purpose of protection from general workplace activities, other operations and adverse weather conditions and how to minimise damage
K19 how to, and the importance of, carrying out the safe disposal of waste in accordance with the following:
• environmental responsibilities
• organisational procedures
• manufacturers’ information
• suppliers’ information
• statutory regulations
• official guidance
K20 why it is important to maintain a safe, clear and tidy work area
P5 Meet the contract specification
K21 how the methods of work to meet the specification are carried out, and how problems are identified and reported, by the application of knowledge for safe, healthy and environmental work practices, procedures and skills, relating to:
• how to record evidence of roofing details, remove, clean, stack, store and salvage reusable existing roof coverings
• the different gauging systems, using modern tape measures and traditional marking sticks, and the effect this will have on traditional details such as valleys
• how to determine, gauge and fix battens and underlays (where required) appropriate to the roof covering
• how to fix direct to boarded surfaces (sarking)
• why it is important to re-lay and replace full or partial natural slates and stone slates and tiled roofs in keeping with the existing roof covering or an earlier style where required
• how to restore and measure, mark out, position, fix and finish existing heritage roof coverings using:
- fixed gauge clay tiles
- clay plain tiles or peg tiles or regular sized natural slates
- stone slates or random length and width natural slates
• how to re-lay ridge to vernacular ridge details, stone-ridge, clay-ridge, lead
• how to re-lay hips to vernacular hip details, stone-ridge, clay-ridge, lead
• how to re-lay top edge and side abutments with and without lead
• the impacts of using new insulation materials within heritage roof coverings
• the benefits of using natural materials for insulation
• how to identify the characteristics of traditional valleys and explain the reasons for their use
• why it is necessary to mix and apply mortar to meet the requirements of the contract
• how to identify the difference and performances between an air lime and hydraulic lime and explain the reasons for their use
• how to remove deteriorated and inappropriate materials
• how to maintain the existing structure
• why it is important to maintain existing structure
• how to integrate existing and new constructional components and finishes
• how to recognise salvageable materials and dispose of damaged materials safely
• how to prepare and store salvageable materials, including historic fabrics and components for re-use
• how to safely strip and salvage existing roof coverings and fittings
• why it is important to validate appropriate ways in which the work should be carried out between traditional and new methods or products
• why it is important to recognise sensitive areas
• why it is necessary to maintain heritage and archaeological integrity
• why it is necessary to maintain the principles of minimum intervention and reversible alterations
• why it is important to stop work at the point where guesswork begins and report findings
• why it is important to record work carried out (written and digital formats)
• why it is necessary to recognise and report endangered and protected flora and fauna
• why it is important to remove deteriorated and inappropriate materials
• how to use all hand tools and ancillary equipment
• how and why operative care and maintenance of all hand and ancillary equipment is carried out
• how to work at height using access equipment
• the relevance of an assessment of significance
• how to recognise specific requirements for:
- structures of special interest
- traditional construction
- hard-to-treat buildings
- historical significance
• how to work with, around and in close proximity to plant and machinery
K22 the organisational procedures with respect to site behaviours, and recognise and action fairness, inclusion and respect within the working environment, and how to address and report inappropriate site behaviours
K23 the importance of methods of work, interpersonal relations and communication and the needs of other occupations associated with re-laying and replacing heritage roof coverings
P6 Allocated time
K24 the programme of work to be carried out including the estimated and allocated time, and why deadlines should be kept or reported if likely to be missed
K25 the types of progress charts, timetables and estimated times and the organisational procedures for reporting circumstances which will affect the work programme