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Thermal and acoustic insulation and underfloor heating - Refresher


The purpose of Thermal and acoustic insulation and underfloor heating – Refresher course is for delegates who have previously passed the full Thermal and acoustic insulation and underfloor heating course or subsequent refresher course and can provide proof of attendance.


2 days of 6 learning hours. If e-learning only, the duration is to be at least 50% of this. 


The purpose of Thermal and acoustic insulation and underfloor heating – Refresher course is for delegates who have previously passed the full Thermal and acoustic insulation and underfloor heating course or subsequent refresher course and can provide proof of attendance. 

Occupational relevance

Training delivered against this standard would be relevant to the following occupational group(s):

  • operative and craft.

Delegates pre-requisites

Delegates must have successfully completed training to the Thermal and acoustic insulation and underfloor heating standard 3 years prior to attending this refresher. 


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 2 years relevant industrial experience
  • a verifiable CV.


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 / practical learning 
  • e-learning 
  • a blend of classroom and e-learning. 

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

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


Methods of assessment considered appropriate for training delivered against this standard are:  

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


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 every 3 years.


Mandatory Renewal.

Buffer / grace period

3 months.

Approval date

May 2021

Review cycle

On request or 3 years from approval date.

Learning outcomes to be refreshed

Learning outcomes to be refreshed

The delegate will be able to: 

Additional guidance to support learning outcome 

demonstrate awareness of the different mechanisms of sound transmission in buildings and that there are building regulation requirements regarding sound transmission 

  • What is sound? 

  • Airborne sound 

  • Impact sound 

Building regulation requirements for impact and airborne sound transmission in new buildings and refurbishments projects  

express understanding of sound transmission test procedures and compliance testing 

  • Airborne and impact sound 

  • Methods of compliance  

  • Pre-completion testing 

  • Use of compliant construction types described in building regulations e.g. Approved Document E (England & Wales), Building Standards Technical Handbook (Scotland) etc. 

  • Bespoke solutions 

  • Robust details https://www.robustdetails.com 

Third party schemes e.g. BREAM, Home Quality Mark, Code for Sustainable Homes etc. 

give examples of how sound moves through buildings and methods of mitigation available 

Methods of sound travel: 

  • air paths 

  • vibration 

  • flanking sound transmission 

Methods of mitigation: 

  • sealing of gaps 

  • use of resilient layers (floating floors) 

isolation hangers 

identify how the use of resilient layers help to prevent sound traveling through a structure 

  • Vibration dampening 

Energy absorption 

demonstrate knowledge of the acoustic materials available for use in resilient layers and their advantages and disadvantages 

Including polyethylene foam, polyurethane foam and rubber 

demonstrate an understanding of the use of acoustic/resilient layers under screeds 

  • Layer construction including underfloor heating systems 

  • Use with soft floor coverings 

Flanking strips 

explain the function of thermal insulation 

  • Maintain the internal temperature of buildings 

  • Reduce energy costs 

  • U-value calculations 

recognise that there are building regulation requirements regarding thermal performance 

Current UK building regulations: 

  • England – Part L 2013 

  • Scotland – Section 6 2015 

  • Wales – Part L 2014 

  • N. Ireland – Technical Booklet F 2012 

  • (or any which supersede the above) 

identify the basic principles of ground floor thermal insulation 

  • Below ground insulation and floor screeds 

  • Thermal insulation upstand requirements 

  • Cold bridges 

Insulation with underfloor heating 

give examples of the types of floor insulation materials available and their advantages and disadvantages 

  • Polyurethane (PUR) and polyisocyanurate (PIR) 

  • White EPS (expanded polystyrene) 

  • Grey EPS (Graphite enhanced Expanded Polystyrene) 

  • XPS (Extruded Polystyrene) 

describe the different types of underfloor heating and their principles of operation 

  • Electric underfloor heating 

  • Warm water underfloor heating 

  • Electric cable configurations/fixing methods 

  • Water pipe configurations and manifolds 

  • Thin/specialist systems 

describe the three types of heat transfer 

  • Conduction, convection and radiation 

explain how the efficiency of underfloor heating systems compares with radiators 

  • Radiators - convected heat 

  • Underfloor heating - radiant heat 

  • Which method is the most efficient? 

express the importance of properly commissioning underfloor heating systems to protect the associated floor screed 

  • General commissioning advice 

  • Prevention of cracking 

Additional information about this standard 

Industry guidance: 

FeRFA Guide to the Specification & Application of Screeds, The Resin Flooring Association

The Resin Flooring Association (FeRFA) website



Building regulations