Yes. This is a competence-based NVQ assessed through workplace evidence.

Do I need to be employed?

You need a suitable workplace role (employed or otherwise) where you can generate the required evidence.

Construction Trades and Building Envelope

Level 2 NVQ Diploma in Waterproof Membrane Roofing Systems (Construction)

A work-based qualification for competent installation and repair of waterproof membrane roofing systems.

Overview

The Level 2 NVQ Diploma in Waterproof Membrane Roofing Systems (Construction) confirms occupational competence in installing and repairing protective membrane systems that keep flat and low-slope roofs watertight. It is intended for operatives working with reinforced bitumen, single-ply or liquid-applied roofing systems on new-build, refurbishment, maintenance and repair projects.

This is a competence-based qualification rather than a classroom-only roofing course. Learners must demonstrate that they can interpret drawings, specifications, method statements and manufacturers’ instructions; prepare suitable roofing backgrounds; install the selected membrane system; complete details around outlets and penetrations; repair defective areas; and work safely at height.

Current approved versions share three principal pathways. Each normally combines five common competence areas with a pathway-specific membrane application unit. Some approved versions also make additional units available for flat-roof decking, green-roof support systems or roof-mounted solar collectors. These additional units are not universally available and do not normally replace the pathway requirements.

Earlier versions using superseded unit content have been withdrawn or replaced. Current specifications retain the same central occupational purpose but may use updated unit wording, assessment criteria and endorsement arrangements.

For employers, the qualification provides structured evidence that an operative can complete membrane roofing activities safely, productively and to the specified standard. For workers, it formally recognises competence developed through genuine roofing work.

Who It’s For

This qualification is intended primarily for people already carrying out waterproof membrane roofing work. It suits operatives who have sufficient responsibility to prepare surfaces, select resources, install or apply a specified system, form detailed waterproof junctions, complete repairs and report defects or unsuitable conditions.

Suitable occupations include:

Waterproof membranes installer
Reinforced bitumen membrane roofer
Built-up felt roofer
Single-ply membrane roofer
Liquid waterproofing operative
Flat-roof maintenance or repair operative
Roofing operative specialising in membrane systems

Learners may work for a roofing contractor, specialist waterproofing business, building maintenance organisation or as a competent self-employed subcontractor. Work may take place on domestic, commercial, industrial or public-sector buildings, including both new and existing roofs.

The learner must have access to the activities required by the selected pathway. This includes real opportunities to prepare roofing backgrounds, use the appropriate tools and system components, form perimeter and penetration details, repair membrane defects and apply the relevant working-at-height controls.

Because workplace competence must be observed and authenticated, employment, self-employment or another genuine workplace arrangement is normally necessary. Occasional access to a training rig is not a substitute for sustained occupational evidence.

Pathways and Specialisms

The qualification recognises that waterproofing operatives do not all install the same type of membrane. Learners therefore follow a pathway that corresponds to the system they use at work. Pathway and endorsement availability must be checked against the approved version through which the learner is registered.

Reinforced Bitumen Membrane Roofing

This pathway is for operatives installing layered reinforced bitumen systems. Work can include air and vapour control layers, insulation, base layers, cap sheets, flashings, trims and membrane details around roof openings and drainage components.

Depending on the approved specification and the learner’s work, an application-method endorsement may identify experience in one of the following:

Pour-and-roll
Torch-on
Flame-free application
Cold-applied systems
Self-adhesive systems
Hot-melt application

The learner must be able to follow the system specification, manage the risks associated with heat, flames, bitumen, adhesives or solvents where applicable, and form durable waterproof details at changes of plane and roof penetrations.

Single-Ply Membrane Roofing

This pathway covers flexible single-ply sheets installed as adhered, mechanically fixed or ballasted systems. The work includes laying the membrane, joining sheets, forming terminations and completing details around upstands, outlets, pipes, vents, rooflights and other penetrations.

Some approved specifications require evidence across a stated combination of adhered, mechanically fixed and ballasted applications. The precise endorsement requirement should be confirmed before assessment begins.

The learner may need to use hot-air welding, solvent-welded joints or taped jointing methods according to the membrane manufacturer’s instructions. They must also understand the purpose of separation layers, protection layers, insulation and water-control membranes in appropriate roof constructions.

Liquid-Applied Membrane Roofing

This pathway is intended for operatives applying liquid waterproofing materials to form a continuous roof membrane. Systems may include single-pack, multi-pack or heated materials, preparation coats, reinforced base coats and finishing coats.

Application can involve brushes, rollers, trowels, squeegees or spray equipment. The learner must control mixing, reinforcement, coverage and application thickness while taking account of curing conditions, temperature, weather and the manufacturer’s stated limitations.

Competence includes forming reinforced details at corners, junctions, upstands, outlets, pipes, vents, gutters, movement joints, rooflights and other interruptions in the roof surface.

Workplace Requirements

Assessment requires access to live waterproof membrane roofing work under normal commercial conditions. The learner must have sufficient opportunities to demonstrate the complete work process rather than isolated training exercises.

Required workplace access normally includes:

Flat or low-slope roofs on new-build, refurbishment, maintenance or repair projects
Roof surfaces requiring inspection, cleaning, drying and preparation
The membrane materials and components used within the selected pathway
Air and vapour control layers, insulation, separation or protection materials where specified
Perimeters, upstands, changes of plane and terminations
Outlets, gutters, pipes, vents, rooflights and structural penetrations
Genuine membrane defects requiring investigation and repair
Safe access arrangements, edge protection and suitable fall-prevention measures
Relevant hand tools, power tools, hot-air equipment, application tools or other pathway-specific equipment
Drawings, specifications, risk assessments, method statements, permits and manufacturers’ technical information

Where hot work is involved, the learner must operate within the applicable permit, fire-prevention and emergency arrangements. Evidence must show that tools and materials are used only within the learner’s authority and that unsafe surfaces, unsuitable resources or changes in site conditions are reported.

Photographs and documents can support assessment, but they do not replace the assessor’s judgement of practical competence in the workplace.

Learning Outcomes

Successful learners can:

Interpret roofing drawings, specifications, schedules, manufacturers’ information, risk assessments, method statements and permits
Plan a logical work sequence and coordinate membrane roofing activities with other trades
Calculate required quantities and allow appropriately for cutting and material wastage
Select membrane materials, components, fixings, tools and ancillary equipment that comply with the specification
Move, handle, protect and store rolls, sheets, liquids, insulation, components and equipment safely
Inspect roofing backgrounds and identify contamination, moisture, defects or other unsuitable conditions
Clean, dry, repair and prepare surfaces for the specified membrane system
Apply primers, preparation coats, separating layers, joint tapes or related preparation materials
Install air and vapour control layers and insulation where required by the roof build-up
Install reinforced bitumen, single-ply or liquid-applied membranes through the selected pathway
Complete waterproof details at edges, upstands, terminations, outlets, pipes, vents, gutters, rooflights and penetrations
Inspect existing membrane systems, identify defects and complete appropriate repairs
Use access equipment, collective protection, PPE and other safety controls when working at height
Protect the roof, surrounding building fabric and other completed work from damage and adverse weather
Segregate and dispose of waste in accordance with workplace and environmental requirements
Identify snags, undertake authorised remedial work and prepare completed work for relevant checks or tests
Communicate problems, progress and changes to supervisors, customers and other occupations
Complete job records, resource information and other required workplace documentation

Units

Current structures normally require five common units and one application unit from the learner’s selected pathway. Reinforced bitumen, single-ply and liquid-applied application units are alternatives; a learner does not normally complete all three to achieve one pathway.

Some current approved versions also offer additional units. These do not generally contribute to the core pathway requirement, and availability should be confirmed before registration.

Follow site inductions, briefings, safety signs and established safe systems of work.
Use collective protection, PPE, RPE and other control equipment in accordance with instructions.
Recognise hazards arising from work at height, fragile surfaces, substances, tools, equipment, storage and changing site conditions.
Report uncontrolled hazards, incidents and circumstances that could make the work unsafe.
Follow procedures for stopping work, evacuation, fire, spillages and injuries.
Maintain welfare, environmental and workplace security arrangements.
Dispose of consumables and other waste through the authorised route.

Communicate appropriately with supervisors, colleagues, customers and other trades.
Interpret organisational information and plan the sequence of membrane roofing activities.
Coordinate resources and work areas so that roofing tasks can proceed without avoidable disruption.
Complete job cards, worksheets, material lists, time records and other required documentation.
Report delays, shortages, defective resources or changes affecting the programme.
Work to the agreed specification while respecting the needs of other people and occupations.
Apply fair, inclusive and professional workplace behaviours.

Interpret handling, storage and lifting information for the resources being used.
Select suitable lifting aids, containers and securing systems.
Apply safe manual-handling techniques and use authorised mechanical assistance where required.
Move, position, store and secure sheet, wrapped, fragile, liquid or component materials.
Protect membranes, insulation, tools and surrounding work from damage and adverse weather.
Maintain clean storage and work areas without obstructing access or drainage routes.
Identify damaged packaging, contaminated materials or unsafe loads and report them.
Manage packaging and waste in accordance with environmental and workplace procedures.

Interpret the specified roof build-up, preparation method and manufacturers’ requirements.
Inspect the substrate and identify moisture, contamination, unevenness, damage or incompatible materials.
Carry out authorised remedial work to the roofing background.
Measure, mark, cut, position and secure preparation materials and components.
Clean and dry surfaces using methods appropriate to the substrate and membrane system.
Apply primers or preparation coats where specified.
Install separating, isolating, carrier or cushion layers and joint tapes.
Use and maintain relevant hand tools, power tools, hot-air equipment or other approved equipment.
Follow hot-work controls where heat-producing equipment is required.
Protect prepared surfaces from traffic, contamination, weather and damage before membrane application.
Report backgrounds that cannot safely or technically receive the specified system.

Interpret repair instructions, specifications, condition information and manufacturers’ procedures.
Inspect the membrane and underlying substrate to identify the nature and extent of defects.
Record and report findings, including suitable photographic or video evidence where required.
Remove debris, blockages, failed materials and damaged membrane without causing unnecessary damage.
Measure, cut, fit, apply, position and secure compatible repair materials.
Repair damaged membrane areas, edges, upstands, penetrations, pipes, vents, perimeters or rainwater outlets as applicable.
Repair or replace damaged insulation, decking and associated components within the learner’s authority.
Reinstate waterproof continuity and complete details to the specified system requirements.
Apply hot-work, access and fall-prevention controls where relevant.
Check the repair, identify remaining defects and report work requiring further specialist attention.

Interpret drawings, specifications, work instructions and manufacturers’ application requirements.
Select suitable bitumen membranes, base layers, cap sheets, insulation, adhesives, fixings and detailing components.
Calculate material quantities and allow for laps, details and wastage.
Install air and vapour control layers and insulation where included in the roof build-up.
Measure, cut, mark out, fit, position and secure membrane materials.
Apply the membrane using the endorsed method, which may include torch-on, pour-and-roll, hot-melt, flame-free, cold-applied or self-adhesive work.
Install base layers, cap sheets, upstands, flashings, trims and terminations.
Form details around eaves, verges, gutters, outlets, pipes, vents, rooflights and structural penetrations.
Control the risks associated with heat, flame, bitumen boilers, gases, adhesives and solvents as applicable.
Inspect laps and details, undertake snagging and prepare the work for required checks or testing.

Select membranes, fixings, adhesives, ballast, protection layers, separation layers and other system components.
Check that materials are compatible with the substrate, roof build-up and manufacturer’s specification.
Install air and vapour control layers and insulation for the specified warm or inverted roof construction.
Measure, mark, cut, fit, position and secure membrane sheets.
Install adhered, mechanically fixed or ballasted systems in accordance with the required pathway endorsement.
Form joints using authorised hot-air, solvent-welded or taped methods.
Complete upstands, internal and external corners, terminations and changes of plane.
Waterproof perimeters, outlets, gutters, pipes, vents, rooflights, safety-system penetrations and other details.
Account for wind, temperature, weather and material-movement requirements.
Inspect seams and details, complete snagging and prepare the roof for specified test procedures.

Select compatible preparation coats, liquid components, reinforcements, insulation, protection materials and detailing products.
Prepare single-pack, multi-pack or heated materials in accordance with the system instructions.
Measure and mix components accurately where required.
Install air and vapour control layers and insulation where included in the roof specification.
Apply base and finishing coats by brush, roller, trowel, squeegee or spray equipment as appropriate.
Control coverage, wet-film thickness, reinforcement placement and curing conditions.
Install fleece, glass-fibre or other specified reinforcement without wrinkles, voids or insufficient saturation.
Form reinforced upstands, corners, junctions, terminations and changes of plane.
Complete details around gutters, outlets, pipes, vents, rooflights, movement joints and structural penetrations.
Protect uncured materials from traffic, contamination, moisture and unsuitable weather.
Inspect the finished membrane, complete snagging and prepare it for required checks or tests.

Interpret deck drawings, surveys, specifications and setting-out information.
Select suitable timber, plywood, particle board, cementitious board or single-skin metal deck materials.
Prepare the work area and cut, fit, lay, position and secure decking.
Create specified falls and check gradients against purlins, joists and datum points.
Form perimeter upstands, openings, outlets and penetrations.
Confirm that the completed deck is secure, even and fit to receive the specified roof system.
Apply edge protection, leading-edge procedures and other working-at-height controls.
Identify structural or dimensional conditions requiring specialist advice.

Interpret the green-roof design, layering sequence and manufacturers’ instructions.
Check the roof structure and protect the completed waterproof membrane.
Measure, mark out, lay, fit, join, seal, position and secure support-system components.
Install the specified combination of root-resistant, protection, irrigation, drainage and filter layers and substrate.
Preserve drainage routes and install measures required to prevent slippage.
Distinguish between relevant intensive and extensive green-roof arrangements.
Avoid puncturing or contaminating the underlying waterproof layer.
Coordinate activities with roofing, landscaping, drainage and other relevant occupations.

Interpret installation drawings, templates, specifications and manufacturers’ information.
Assess the installation area and the roof’s orientation and condition.
Measure, mark out and prepare the roof for the specified collector.
Remove or omit waterproofing elements only as required by the approved installation method.
Prepare and weatherproof penetrations and install required supports.
Position and secure integrated or mounted photovoltaic or solar-thermal collectors as endorsed.
Reinstate roof coverings, flashings and waterproof details around the completed installation.
Protect the surrounding membrane from heat, sharp edges, fixings and foot traffic.
Use access equipment and fall-prevention measures appropriate to the work.
Coordinate with other competent trades responsible for associated services and commissioning.

Assessment

Assessment establishes whether the learner can consistently perform waterproof membrane roofing work to the required occupational standard. It combines direct evidence of practical performance with evidence confirming the learner’s technical knowledge and understanding.

Workplace Observation

An occupationally competent assessor observes the learner carrying out relevant membrane roofing activities in a real work environment. Observation may include surface preparation, membrane installation, detailing, repair, resource handling and the application of working-at-height controls.

The observed work must correspond to the selected pathway and any required endorsements. For example, a single-ply candidate may need to demonstrate the specified attachment methods, while a reinforced bitumen candidate must be assessed using the application method recorded for the unit.

Portfolio and Work Products

The learner compiles authenticated evidence showing achievement of every required learning outcome and assessment criterion. Suitable occupation-specific evidence can include:

Photographs or video showing preparation, installation stages and completed details
Assessor observation reports
Drawings, specifications and relevant extracts from work instructions
Risk assessments, method statements and hot-work permits
Records of materials and system components used
Job cards, worksheets, timesheets or progress records
Inspection, snagging and remedial-work records
Defect reports and evidence of completed membrane repairs
Witness testimony from competent supervisors or roofing professionals
Completed roof details and other identifiable work products

Evidence should identify the learner’s own contribution, particularly where roofing work is completed by a team.

Knowledge and Professional Discussion

Questioning, professional discussion, written responses or relevant assignments may be used to confirm knowledge that is not fully apparent from observation.

This can include:

Roof build-ups and condensation control
Material compatibility and manufacturers’ limitations
Causes of membrane defects and appropriate repair methods
Effects of temperature, moisture and weather on installation
Hot-work and fire-prevention requirements
Working-at-height and fragile-roof controls
Waste, sustainability and environmental responsibilities
Procedures for reporting unsuitable substrates, defective materials or work outside the learner’s authority

Recognition of Prior Learning

Existing authenticated evidence may be considered where it remains current, relevant and sufficient. Previous experience alone is not automatically accepted; it must demonstrate the required competence and be capable of verification.

Simulation Restrictions

Practical workplace skills for these units cannot ordinarily be simulated. Training-centre exercises, written explanations or online discussions cannot replace evidence of preparing, installing and repairing membrane systems during genuine work.

Knowledge questioning may supplement workplace evidence, but it cannot be used to manufacture practical competence that has not been demonstrated. The complete evidence must show consistent performance across the required activities, details and endorsement conditions.

To achieve the diploma, the learner must satisfy every learning outcome and assessment criterion in the common units and the selected pathway unit.

Career Progression

Achievement confirms competence at skilled operative level within the learner’s membrane roofing specialism. It can support continued employment or contracting work, but it does not guarantee a particular role, promotion or level of responsibility.

Occupational Roles

Depending on the completed pathway and workplace experience, relevant roles include:

Waterproof membranes installer
Built-up felt or reinforced bitumen membrane roofer
Single-ply membrane roofer
Liquid waterproofing operative
Flat-roof repair and maintenance operative
Specialist roofing operative working on new-build or refurbishment projects

Additional green-roof, decking or solar-related responsibilities require the relevant workplace competence and may require further training beyond the core diploma.

Specialist Development

Operatives may broaden their skills by gaining workplace experience in another membrane system, more complex roof details, leak investigation, repair work, green-roof support systems or roof-deck installation.

Further manufacturer or employer training may also be required before using particular hot-work equipment, proprietary products, spraying equipment or specialist testing methods.

Supervision and Management

Experienced operatives who begin planning and monitoring the work of others may progress to an occupational work supervision qualification. Those taking responsibility for wider site coordination may later consider a construction site supervision qualification.

Progression to supervisory or management roles depends on the person’s actual duties, experience and ability to demonstrate the higher-level planning, coordination, monitoring and leadership requirements.

CSCS Card

The relevant membrane roofing pathways are officially mapped to the Blue Skilled Worker card for specific roofing occupations. Completing the qualification may therefore support an application, but the diploma does not automatically issue or guarantee a card.

The current occupational mappings are:

Reinforced bitumen membrane roofing — Built Up Felt Roofing
Single-ply membrane roofing — Single Ply Roofing
Liquid-applied membrane roofing — Liquid Waterproofing Operative

Applicants for these occupations are required to pass the CITB Health, Safety and Environment Specialist Work at Height test. The test must meet the current validity requirement when the card application is made.

The learner must apply separately for the card and provide the required qualification and test evidence. The occupational title and pathway shown on the certificate must correspond to the occupation selected for the application. Current requirements should always be checked through the official Card Finder before applying.

FAQs

These questions address the pathway, workplace and assessment issues that are particularly important when choosing this qualification.

It proves that the learner can prepare, install and repair waterproof membrane roofing systems safely and to the required workplace specification. The precise application competence is determined by the completed reinforced bitumen, single-ply or liquid-applied pathway.

Normally, yes. The qualification requires authenticated evidence from genuine roofing work, including direct observation of practical competence. A learner therefore needs employment, self-employment or another suitable arrangement that provides regular access to the required activities.

No. The usual structure requires the common units and the application unit for one selected pathway. A learner may broaden their competence later, but reinforced bitumen, single-ply and liquid-applied application units are not all compulsory for one pathway award.

The pathway should match the membrane system the learner installs in normal employment. A reinforced bitumen operative should not select the liquid-applied pathway merely because occasional liquid products are used for small details. The assessor should confirm that the learner’s work provides sufficient evidence for the complete pathway and any required endorsements.

Workplace evidence of the practical skills cannot ordinarily be simulated. The learner must demonstrate preparation, installation, detailing, repair and safe working through real occupational activity. Questioning and professional discussion can confirm knowledge but cannot replace practical performance.

The required details depend on the pathway and available work, but typically include edges, upstands, terminations, changes of plane, gutters, rainwater outlets, pipes, vents, rooflights and structural penetrations. The learner must be able to maintain waterproof continuity around the relevant details.

No. These are additional units in certain approved versions and do not normally replace the common units or selected membrane application unit. Availability and endorsement requirements must be confirmed before registration.

The reinforced bitumen, single-ply and liquid-applied pathways are mapped to relevant Blue Skilled Worker card occupations. Applicants must make a separate card application, hold the correctly mapped pathway and pass the current CITB Health, Safety and Environment Specialist Work at Height test.

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