The Future Homes Hub has produced this guide to help explain the potential advantages of using Dynamic Thermal Modelling (TM59) to demonstrate compliance with Building Regulations Approved Document O – Overheating 2021 (ADO).
In this Guide the term ‘TM59’ has been used as shorthand for Dynamic Thermal Modelling to assess overheating, following the CIBSE TM59 guidance supplemented by the requirements of ADO.
The Hub has also produced ‘Part O 2021 Builders Guidance – Where to start guide’ (link) and a full ‘Part O 2021 Technical Guidance’ (link). This guide should be read alongside both of these publications.
About the guide
The guide is intended to help small builders and developers.
It has some introductory pages explaining briefly the differences between the ADO Simplified Method and Dynamic Thermal Modelling and uses four example houses to illustrate the principles of Dynamic Thermal Modelling and some of the benefits.
The example houses have been chosen to illustrate:
- The regional differences resulting from weather files in twelve locations
- The benefits when aspects of the house design have been fixed (for instance a house or house type designed before the introduction of ADO in 2021)
- The effect of orientation and the limitations imposed on opening windows that are not secure
- The potential benefits using measures that are not available when using the ADO Simplified Method.
Click here to find out more about the Future Homes Hub’s work on building regulations.